main roads queensland

Main Roads

Standard Specification

MRS11.91

Ducts and Pits

December 07

COPYRIGHT State of Queensland (Department of Main Roads) 2007

Copyright protects this publication. Except for the purposes permitted by and subject to the conditions prescribed under the Copyright Act, reproduction by any means (including electronic, mechanical, photocopying, microcopying or otherwise) is prohibited without the prior written permission of the Queensland Department of Main Roads. Enquiries regarding such permission should be directed to the Road & Delivery Performance Division, Queensland Department of Main Roads.

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December 07

Department of Main Roads MRS11.91 Standard Specification Ducts and Pits

Page i of iii MRS11.91

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Table of Contents

Page

1 INTRODUCTION.........................................................................................................................................1 2 DEFINITION OF TERMS ............................................................................................................................1 3 REQUIREMENTS FOR THE INSTALLATION OF CABLES ......................................................................2

3.1 General ................................................................................................................................................2 3.2 Electrical Systems................................................................................................................................2 3.3 Telecommunication Systems ...............................................................................................................2

4 MEASUREMENT OF WORK ......................................................................................................................2 4.1 Standard Work Items ...........................................................................................................................2 4.2 Work Operations ..................................................................................................................................2 4.3 Calculations of Quantities ....................................................................................................................2

5 STANDARD TEST METHODS ...................................................................................................................3 5.1 Materials...............................................................................................................................................3 5.2 Installation of Pits .................................................................................................................................3 5.3 Installation of Conduit and Conduit Fittings .........................................................................................3 5.4 Backfilling .............................................................................................................................................4

6 QUALITY SYSTEM REQUIREMENTS.......................................................................................................6 6.1 Hold Points, Witness Points and Milestones .......................................................................................6 6.2 Construction Procedure .......................................................................................................................7 6.3 Conformance Requirements ................................................................................................................8

7 MATERIALS ................................................................................................................................................8 7.1 Electrical Conduit Underground...........................................................................................................8

7.1.1 General .........................................................................................................................................8 7.1.2 Non-metallic Rigid Conduit ...........................................................................................................8 7.1.3 Metallic Conduit ............................................................................................................................8 7.1.4 Flexible Conduit ............................................................................................................................8

7.2 Electrical Conduit and Conduit Fittings Surface Mounted ...................................................................8 7.2.1 General .........................................................................................................................................8 7.2.2 Non-metallic Conduit ....................................................................................................................9 7.2.3 Metallic Conduit ............................................................................................................................9 7.2.4 Flexible Conduit ............................................................................................................................9 7.2.5 Heterogeneous Conduit................................................................................................................9 7.2.6 Fixings...........................................................................................................................................9

7.3 Electrical Conduit within a Structure / Barriers ....................................................................................9 7.3.1 General .........................................................................................................................................9 7.3.2 Non-Metallic Conduit ....................................................................................................................9 7.3.3 Flexible Conduit ............................................................................................................................9 7.3.4 Heterogeneous Conduit................................................................................................................9

7.4 Telecommunications Conduit...............................................................................................................9 7.5 Conduit for Boring/Jacking.................................................................................................................10 7.6 UPVC Priming Fluid and Solvent Cement .........................................................................................10 7.7 Circular Pits & Covers........................................................................................................................10

7.7.1 Pit................................................................................................................................................10 7.7.2 Collar...........................................................................................................................................10 7.7.3 Cover ..........................................................................................................................................11

7.8 Rectangular Pits & Covers.................................................................................................................12 7.8.1 Pit................................................................................................................................................12 7.8.2 Covers.........................................................................................................................................12

7.9 Marker Tape.......................................................................................................................................13 7.10 Draw Rope......................................................................................................................................13 7.11 Cable Junction Enclosure Mounting Strap .....................................................................................14 7.12 Bedding Sand.................................................................................................................................14 7.13 Granular Filter Material...................................................................................................................14

MRS11.91 Department of Main Roads Ducts and Pits Standard Specification

Page ii of iii MRS11.91 December 07

7.14 Concrete ........................................................................................................................................ 14 7.15 Backfill............................................................................................................................................ 14

8 APPROVAL OF MATERIALS................................................................................................................... 14 9 EXCAVATION FOR UNDERGROUND CONDUITS AND PITS .............................................................. 14

9.1 GENERAL ......................................................................................................................................... 14 9.2 Trench Width ..................................................................................................................................... 14 9.3 Trench Walls ..................................................................................................................................... 14 9.4 Bottom of Trench............................................................................................................................... 14 9.5 Timing of Excavation ......................................................................................................................... 14 9.6 Existing Pavement............................................................................................................................. 15 9.7 Boring and/or Jacking........................................................................................................................ 15 9.8 Excavated Material............................................................................................................................ 15 9.9 Trench Depth..................................................................................................................................... 15

9.9.1 General ...................................................................................................................................... 15 9.9.2 Minimum and Maximum Cover .................................................................................................. 15

9.10 Surplus Excavated Material ........................................................................................................... 15 10 INSTALLATION OF CONDUITS .............................................................................................................. 15

10.1 General .......................................................................................................................................... 15 10.2 Location ......................................................................................................................................... 15 10.3 Conduit Bore.................................................................................................................................. 15 10.4 Road Crossings ............................................................................................................................. 15 10.5 Changes in Levels or Direction of Conduit .................................................................................... 16 10.6 Bends............................................................................................................................................. 16

10.6.1 Use of Bends.............................................................................................................................. 16 10.6.2 Bends for Road Crossing Conduits............................................................................................ 16 10.6.3 Bends for Backbone Conduits ................................................................................................... 16

10.7 Bedding of Conduit ........................................................................................................................ 16 10.8 Conduit at Pits ............................................................................................................................... 16 10.9 Shared Trenches and Adjacent Conduits...................................................................................... 17 10.10 Marking Tape................................................................................................................................. 17 10.11 Jointing........................................................................................................................................... 17

10.11.1 General................................................................................................................................... 17 10.11.2 Non-metallic Conduit .............................................................................................................. 17 10.11.3 Metallic Conduit ...................................................................................................................... 17 10.11.4 Flexible Conduit...................................................................................................................... 17

10.12 Draw Rope..................................................................................................................................... 17 10.13 Conduit Plugs / Bungs ................................................................................................................... 17 10.14 Conduits Encased in Concrete in a Structure / Barrier.................................................................. 17 10.15 Surface Mounted Conduits ............................................................................................................ 18 10.16 Flexible Conduit in Concrete ......................................................................................................... 18

11 INSTALLATION OF PITS......................................................................................................................... 18 11.1 General .......................................................................................................................................... 18 11.2 Location ......................................................................................................................................... 18 11.3 Numbering of Pits .......................................................................................................................... 18 11.4 Bedding of Pit ................................................................................................................................ 18 11.5 Finished Surface Level .................................................................................................................. 18 11.6 Entry of Conduit ............................................................................................................................. 19 11.7 Installation of Pit over Existing Conduit ......................................................................................... 19 11.8 Drainage ........................................................................................................................................ 19 11.9 Pits installed on Batter Slopes....................................................................................................... 19

12 BACKFILLING .......................................................................................................................................... 19 12.1 General .......................................................................................................................................... 19 12.2 Pits ................................................................................................................................................. 19 12.3 Precautions Against Damage or Movement .................................................................................. 19 12.4 Roadways ...................................................................................................................................... 19 12.5 Footways ....................................................................................................................................... 19

13 SURFACE TREATMENT ......................................................................................................................... 20


Page iii of iii MRS11.91

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14 ABANDONED CONDUITS........................................................................................................................20 15 HANDLING, PACKAGING, STORAGE AND DELIVERY.........................................................................20 APPENDIX


Page 1 of 20 MRS11.91

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Conduits and Pits 1 INTRODUCTION This specification applies to the requirements for the supply, installation and testing of materials, pits, conduits and conduit fittings used to form a segregated wiring enclosure for the housing and protection of either electrical or telecommunication cables.

The wiring enclosure may be either

Underground; In a structure / barrier; or On a surface. All new installations shall segregate electrical cables from telecommunication cables by way of separate wiring enclosures.

This specification shall be read in conjunction with Standard Specifications MRS11.01, MRS11.50 and other specifications as appropriate.

This specification forms part of the Standard Specifications - Roads Manual.

2 DEFINITION OF TERMS For the purpose of this Specification, in addition to those defined in Clause 3 of MRS11.01, the definitions in Table 1 apply.

Table 1 - Definition of Terms

Term Definition

AS/ACIF S008 Requirements for Authorised Cabling Products.

AS/ACIF S009 Installation Requirements for Customer Cabling (Wiring Rules).

AS/NZS3000 Australian / New Zealand Standard Wiring Rules.

Act Electrical Safety Act 2002 and associated Regulations and Codes of Practice.

Registered Cabling Provider

A cabling provider registered in accordance with the ACMA Telecommunications Cabling Provider Rules 2000.

Cabling Work As defined in AS/ACIF S009, including trenches, pits and conduits for communications services.

Conduit Parts of a closed wiring system used to enclose cables in an electrical or telecommunications installation, which allows the cables to be drawn in or replaced. Conduits shall have a circular cross-section. Conduits shall include couplers, elbows, junction boxes, tees and fixings.

Conduit Bends Prefabricated curved lengths of conduit designed to join two conduits in accordance with Clause 10.5 of this specification.

Elbow A conduit bend of shorter combination of length and angle than defined in Clause 10.5 of this specification.

Electricity Entity As defined in the Act.

Electrical Supervisor An Electrical Engineer and/or Licensed Electrical Contractor.

Extra Low Voltage Not exceeding 50 V a.c., or 120 V, ripple free d.c.

Licensed Electrical Contractor Holder of an Electrical Contractor License under the Act.

Low Voltage Exceeding Extra Low Voltage but not exceeding 1000 V a.c. or 1500 V d.c.


Page 2 of 20 MRS11.91 December 07

Term Definition

Pit A wiring enclosure used to provide space for placing and joining cables, pulling cables, performing an operation on cables or for the inclusion of other equipment.

Superintendent In the context of this specification, the Superintendent (or representative) must have formal electrical qualifications.

Unregistered Cabling Provider

A person who is not a Registered Cabling Provider, but who is directly supervised by a Registered Cabling Provider.

Wiring Rules AS/NZS3000 and/or AS/ACIF S009 as appropriate to the respective service.

3 REQUIREMENTS FOR THE INSTALLATION OF CABLES 3.1 General Cables will normally be installed in underground wiring systems. In some instances, the wiring systems may be encased in concrete or mounted on a surface. The wiring systems are required to provide mechanical protection to the cables in order to ensure a degree of safety. This mechanical protection is provided by installing the cables in a wiring enclosure, formed by the use of conduits and pits.

3.2 Electrical Systems Electrical cables are installed to provide power and/or lighting circuits to equipment installed in the field, including traffic signals, road lighting and other Intelligent Transport Systems equipment.

The Contractor must engage an Electrical Supervisor and/or Licensed Electrical Contractor to perform the duties and functions of "electrical works" as defined in the Act.

Wiring enclosures forming part of an electrical wiring system shall be installed in accordance with the Wiring Rules and/or Electricity Entity's requirements, under the supervision of an Electrical Supervisor.

3.3 Telecommunication Systems Telecommunication cables are installed to transmit video, data and voice between Intelligent Transport System devices installed in the field and the Traffic Management Centres.

Wiring enclosures forming part of a telecommunications wiring system shall be installed in accordance with AS/ACIF S009.

The Contractor must engage a Registered Cabling Provider and/or a Licensed Electrical Contractor under the direct supervision of a Registered Cabling Provider to perform the telecommunications cabling works.

4 MEASUREMENT OF WORK 4.1 Standard Work Items In accordance with the provisions of Clause 2 of MRS11.01, the standard work items covered by this specification are listed in Table 2.

4.2 Work Operations All Work Operations listed in Table 3 shall also include those Work Operations listed in Clause 2.2.5 of MRS11.01.

4.3 Calculations of Quantities Supply and installation of conduits shall be measured from pit centre to pit centre or to the termination point of the conduit as shown on the Drawings.

Sections of conduit installed between a backbone or road crossing pit and an item of equipment installed in the field, including traffic signals, road lighting and other Intelligent Transport Systems equipment, shall not be measured separately. Such lengths shall be measured as part of the supply and installation of the relevant item of equipment. Backbone and road crossing conduits are shown and defined in Figure 1.

Supply and installation of conduit bends shall be included in the standard items listed for supply and installation of conduit.

Supply and installation of pits shall be measured per each for each type of pit.



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Conduit installation quantities including, but not limited to installation, testing and acceptance, shall be designated through consultation with the Principal. This may result in the installations being divided into lots or some other suitable mechanism for payment and measurement.

5 STANDARD TEST METHODS 5.1 Materials The Contractor shall ensure that compliance testing of all materials meets the requirements of MRS11.50. In addition, the following testing shall be carried out.

For conduits and pits forming an electrical wiring enclosure, the Electrical Supervisor shall certify that the materials and installation complies with the Drawings, the Standard Specifications, Australian Standards, and Regulations. Milestone

For conduits and pits forming a telecommunications wiring enclosure, the Telecommunications Supervisor shall certify that the materials and installation complies with the Drawings, the Standard Specifications, Australian Standards, and Regulations. Milestone

5.2 Installation of Pits The Contractor shall inspect all pits to ensure that

a) The top surface of the pit and the adjacent finished surface level is within the required tolerance;

b) Compaction around the pit has not caused a horizontal deformation of the inside wall of the pit of more than 20 mm from the pits normal, uninstalled state;

c) The pit lids can be easily installed and removed; and

d) The conduit entry and exit points are within the defined tolerances.

The Contractor shall effect repairs or replace the pit and re-test to ensure that these requirements are met.

5.3 Installation of Conduit and Conduit Fittings Prior to installation, the Contractor shall inspect all conduit and conduit fittings to ensure that they are free of any defects that could damage the cables during installation.

After installation and backfilling, the conduit and conduit fittings shall be proved by drawing a mandrel having a diameter of at least 95% of the internal diameter of the conduit. Witness Point The mandrel shall have a length sufficient to allow it to pass around any bends in the conduit, but not shorter than 95% of the diameter of the conduit being tested. Milestone

The Contractor shall effect repairs and retest the conduit should the mandrel not pass unhindered through the conduit.

Table 2 - Standard Work Items

Standard Item No.

Description Unit of Measurement

Conduit and Conduit Fittings Underground

6501 Supply of [diameter] mm, [material], [type] conduit. m

6502 Supply of [diameter] mm, [material], [type] conduit for boring or jacking. m

6503 Installation of [No.] of [diameter] mm, [material], [type] conduit(s), in [surface]. m

6504 Installation of [No.] of [diameter] mm, [material], [type] conduit(s) and [No.] of [diameter] mm, [material], [type] conduit(s), in a shared trench, in [surface].

m

6505 Installation of [diameter] mm, [material], [type] conduit, bored or jacked. m

6506 Supply and installation of [No.] of [diameter] mm, [material], [type] conduit(s), in [surface]. m



Standard Item No.

Description Unit of Measurement

6507 Supply and installation of [No.] of [diameter] mm, [material], [type] conduit(s) and [No.] of [diameter] mm, [material], [type] conduit(s), in a shared trench, in [surface].

m

6508 Supply and installation of [diameter] mm, [material], [type] conduit, bored or jacked. m

Conduit and Conduit Fittings Mounted in Concrete Structure / Barrier

6513 Installation of [No.] of [diameter] mm, [material], [type] conduit(s) in concrete structure / barrier. m

6516 Supply and installation of [No.] of [diameter] mm, [material], [type] conduit(s) in concrete structure / barrier. m

Conduit and Conduit Fittings Mounted on the Surface

6521 Supply of [diameter] mm, [material], [type] conduit, suitable for mounting on a surface. m

6523 Installation of [No.] of [diameter] mm, [material], [type] conduit(s), surface mounted. m

6526 Supply and installation of [No.] of [diameter] mm, [material], [type] conduit(s), surface mounted. m

Ancillary Works

6531 Supply of Draw Rope. m

6532 Installation of draw rope in existing conduits. m

6533 Supply and installation of draw rope in existing conduits. m

6534 Flush and clear conduits (All types). m

6535 Removal and transport of conduits, (All diameters, All materials, All types). m

6536 Removal of cable joining pit(s) (All types). each

Cable Jointing Pits

6551 Supply of cable jointing pit(s) [type]. each

6552 Installation of cable jointing pit(s) [type]. each

6553 Supply and installation of cable jointing pit(s) [type]. each

6554 Construction of pit surround. each

6555 Supply of maintenance marker posts. each

6556 Installation of maintenance marker posts. each

6557 Supply and installation of maintenance marker posts. each

5.4 Backfilling Testing of compaction of backfilling shall be carried out in accordance with Clause 16 of MRS11.04.

Table 3 - Work Operations

Item No.

Work Operation



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Item No.

Work Operation

6501 a) Supply of conduit and conduit bends, primer and adhesive for jointing, draw rope and marking tape.

6502 a) Supply of conduit for boring or jacking and draw rope.

6503 6504

a) Excavation of trench. b) Installation of conduit and conduit bends. c) Supply and installation of bedding and backfill materials. d) Supply and installation of marker tape. e) Supply and installation of draw rope. f) Reinstatement of original surface. g) Testing of conduit and conduit bends.

6505

a) Provision of boring/ jacking equipment. b) Supply and installation of conduit. c) Supply and installation of draw rope. d) Excavation of working spaces. e) Storage of excavated materials. f) Reinstatement of working spaces. g) Testing of conduit and conduit bends.

6506 6507

a) Supply and installation of conduit and conduit bends, primer and adhesive for jointing. b) Excavation of trench. c) Supply and installation of bedding and backfill materials. d) Supply and installation of marker tape. e) Supply and installation of draw rope. f) Reinstatement of original surface. g) Testing of conduit and conduit bends.

6508

a) Supply of conduit for boring or jacking. b) Supply and installation of draw rope. c) Provision of boring/jacking equipment. d) Excavation of working spaces. e) Storage of excavated materials. f) Reinstatement of working spaces. g) Testing of conduit and conduit bends.

6513 a) Temporary fixing of conduit as necessary prior to construction of barrier. b) Installation of conduit within barrier. c) Supply and installation of cable access points as required.

6516

a) Supply of conduit, primer and adhesive for jointing, draw rope. b) Temporary fixing of conduit as necessary prior to construction of barrier. c) Installation of conduit, primer and adhesive for jointing, draw rope within barrier. d) Supply and installation of cable access points as required.

6521 a) Supply of conduit and conduit bends suitable for mounting on a surface, primer and adhesive for jointing, draw rope.

6523 a) Installation of conduit, surface mounted on to a structure. b) Supply and installation of expansion joints and cable access points as required.



Item No.

Work Operation

6526

a) Supply of conduit and conduit bends suitable for mounting on a surface, primer and adhesive for jointing, draw rope.

b) Installation of conduit, surface mounted on to a structure. c) Supply and installation of expansion joints and cable access points as required.

6531 a) Supply of draw rope to site.

6532 a) Installation of draw rope in conduits and conduit bends.

6533 a) Supply of draw rope to site. b) Installation of draw rope in conduits and conduit bends.

6534 a) Flush conduits and clear any blockages.

6535 a) Removal and disposal of conduit or transport to Principals store. b) Backfill and reinstatement of disturbed areas.

6536 a) Removal and disposal of pit or transport to Principals store. b) Backfill and compaction of disturbed areas.

6551 a) Supply of pits and pit cover(s) and storage on site. b) Supply conduit bell mouths to suit pit.

6552 a) Installation of pit and pit cover(s). b) Supply and installation of bedding and backfill materials. c) Installation of conduit, conduit bends and bell mouths into the pit.

6553

a) Supply of pits and pit cover(s) and storage on site. b) Installation of pit and pit cover(s). c) Supply and installation of bedding and backfill materials. d) Installation of conduit, conduit bends and bell mouths into the pit.

6554

a) Supply of all materials. b) Local excavation where necessary. c) Construction of pit surround. d) Backfill and compaction of disturbed areas.

6555 a) Supply of maintenance marker post(s) and storage on site.

6556 a) Installation of maintenance marker post in concrete pad.

6557 a) Supply and installation of maintenance marker post in concrete pad.

6 QUALITY SYSTEM REQUIREMENTS 6.1 Hold Points, Witness Points and Milestones General requirements for Hold Points, Witness Points and Milestones are specified in Clause 5 of MRS11.01.

The Hold Points, Witness Points and Milestones applicable for this specification are summarised in Table 4.

Table 4 - Hold Points, Witness Points and Milestones

Clause Quality System Requirement

5.1 Standard Test Methods Milestone (x 2)

5.3 Installation of Conduit and Conduit Fittings Witness Point, Milestone

6.2 Construction Procedure Milestone, Hold Point 1



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Clause Quality System Requirement

7.2.1 Electrical Conduit and Conduit fittings Surface Mounted Hold Point 2

7.2.6 Approval of fixing methods Witness Point

7.7.2.2 Circular pit collar material Hold Point 3

7.7.3.2 Circular pit cover material Hold Point 4

7.10 Draw Rope Hold Point 5

8 Approval of Materials Hold Point 6

9.1 - Excavation for Underground conduits and pits Hold Point 7

9.4 - Bottom of Trench Witness Point

9.7 Boring and/ or Jacking Hold Point 8

10.2 Non-metallic Conduits location Hold Point 9, Hold Point 10, Witness Point

10.6.1 Use of Bends Hold Point 11

10.8 Conduits at Pits Hold Point 12

10.11.2 Non-metallic Conduits location Witness Point

10.15 Conduits installed on a surface Hold Point 13

10.16 Flexible Conduits Hold Point 14, Witness Point

11.2 Pit locations Hold Point 15

11.9 Pit installed on batter slopes Hold Point 16

12.1 Backfill General Witness Point

12.3 Precautions Against Damage or Movement Witness Point

6.2 Construction Procedure In accordance with Clause 5 of MRS11.50, the Contractor is required to submit a construction procedure for the conduits and pits to the Superintendent. Milestone

This construction procedure shall include but not be limited to detailing the materials and methods to be used for:

a) Pits;

b) Conduits;

c) Pits over existing conduits;

d) Marker Tape;

e) Draw rope;

f) Shared trenches;

g) Fixing brackets and/or anchors for attachment to structures;

h) Storage of materials on site;

i) Disposal of excess materials;

j) Boring and/or jacking methods;

k) Product identification and traceability; and

l) Inspection and test plans.

All materials must be approved by the Superintendent before use unless the materials have been previously approved by the Principal as a Standing Offer Arrangement item. Hold Point 1



6.3 Conformance Requirements The conformance requirements, which apply to lots of work covered by this specification are summarised in Table 5.

Table 5 - Conformance Requirements

Clause Conformance Requirements

7.7.3.2 7.8.2.2

Materials Conformance

10.2 Location of Conduits and Tolerances

10.5 Changes of Level, Direction and Minimum Cover

10.6.3 Cold Bending of Conduits

10.12 Draw Rope

11.6 Entry of Conduit

11.7 Installation of Pit over Existing Conduit

7 MATERIALS 7.1 Electrical Conduit Underground 7.1.1 General Conduit and conduit bends forming part of an underground wiring enclosure shall be identified by the addition of an orange marker tape complying with AS 2648.1.

Tees and elbows shall not be installed underground.

Conduit installed for the installation of Low Voltage wiring systems shall be one of the following types

7.1.2 Non-metallic Rigid Conduit Non-metallic conduit and conduit bends shall be orange, heavy duty rigid UPVC complying with the requirements of AS 2053, Part 2. The conduit shall not have a corrugated outer surface.

7.1.3 Metallic Conduit Metallic conduits and conduit bends shall be either

a) A material classified as metal complying with the requirements of AS 2053, Part 7, or

b) Heavy duty galvanised steel tube complying with the requirements of AS 1074.

All metallic conduits shall be free of burrs that may damage cables or alternatively shall be installed with PVC sleeves to prevent damage to cables.

Metallic conduits and bends must be earthed as necessary to comply with the Wiring Rules.

7.1.4 Flexible Conduit Flexible conduit must comply with AS 2053, Part 4 or AS 2053, Part 8 and may only be used in specific situations with prior approval of the Superintendent.

7.2 Electrical Conduit and Conduit Fittings Surface Mounted 7.2.1 General Conduit installed for the installation of Low Voltage wiring systems shall be one of the following types subject to approval by the Superintendent. Hold Point 2

Tees and elbows shall have inspection plates and be installed further than three (3) metres from areas that may be accessed by the public.



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7.2.2 Non-metallic Conduit Unless protected by a metal cover to the satisfaction of the Superintendent, non-metallic conduit and conduit bends may only be used where further than three (3) metres from areas that may be accessed by the public. They shall be heavy duty rigid UPVC complying with the requirements of AS 2053, Part 2. The conduit shall not have a corrugated outer surface.

In addition, the conduits and conduit bends shall be classified as having protection against solar radiation and marked with the letter T, indicating such protection.

7.2.3 Metallic Conduit Metallic Conduits shall be used within three (3) metres of areas that may be accessed by the public.

Metallic conduits and conduit bends shall be either

a) A material classified as metal complying with the requirements of AS 2053, Part 7, or

b) Heavy galvanised steel tube complying with the requirements of AS 1074.

All metallic conduits shall be free of burrs that may damage cables or alternatively shall be installed with PVC sleeves to prevent damage to cables.

PVC adaptors shall be used where holes are drilled in metallic conduits.

Metallic conduits and bends must be earthed as necessary to comply with the Wiring Rules.


7.2.5 Heterogeneous Conduit Where two different types of conduit are joined, proprietary conduit mating joints (preferably threaded) or junction boxes shall be used, subject to the approval of the Superintendent.

7.2.6 Fixings The Contractor shall submit samples of proposed fixings and request approval by the Superintendent at least 14 days prior to proposed use. Witness Point

7.3 Electrical Conduit within a Structure / Barriers 7.3.1 General Conduit and conduit bends forming part of a wiring enclosure in a structure shall be orange in colour.

Tees and elbows shall not be installed within structures.

Conduit installed for the installation of Low Voltage wiring systems shall be one of the following types.

7.3.2 Non-Metallic Conduit Non-metallic conduit and conduit bends shall be orange, heavy duty rigid UPVC complying with the requirements of AS 2053 Part 2. The conduit shall not have a ribbed outer surface.


7.3.4 Heterogeneous Conduit Where two different types of conduit are joined, proprietary conduit mating joints (preferably threaded) or junction boxes shall be used, subject to the approval of the Superintendent.

7.4 Telecommunications Conduit Telecommunications conduit and conduit bends forming part of a wiring enclosure shall comply with the requirements of Clause 5.3 of AS/ACIF S008 except they shall be heavy duty. This applies to underground, on the surface and in the structure wiring enclosures. Telecommunications conduits shall not have a ribbed outer surface.



In addition, a white marker tape, complying with AS 2648.1, shall be installed above the conduit to identify the underground wiring enclosure.

7.5 Conduit for Boring/Jacking Conduit used for boring/jacking shall be continuous and manufactured of Polyethylene (or equivalent), with a wall thickness of at least 9 mm.

7.6 UPVC Priming Fluid and Solvent Cement A standard UPVC priming fluid and solvent cement, manufactured to AS 3879, shall be used to join all UPVC conduits and conduit fittings.

7.7 Circular Pits & Covers 7.7.1 Pit 7.7.1.1 General Arrangement Circular pits shall be manufactured to the dimensions and arrangement shown on Standard Drawing No. 1415.

7.7.1.2 Material Pits shall be manufactured of materials capable of being buried without any damaging effects, or shall be treated for this purpose. Pits shall have smooth internal walls.

Pits manufactured from plastic materials are acceptable. All materials shall have protection against solar radiation.

Pits shall be supplied as one complete unit with the base permanently attached. If the base is manufactured separate to the walls it shall be attached using non-corrosive materials that do not protrude from the pit wall.

7.7.1.3 Mechanical Strength of Pits The pit shall have sufficient vertical capacity to support the Class B design load when tested in accordance with AS 3996 where the load is transferred by the collar into the pit wall only via 12 off M16 bolts. The resultant permanent vertical deformation of the pit and collar system after the load is removed shall be less than 10 mm.

7.7.1.4 Weight The pit shall have a lifting weight of less than 40 kg.

7.7.2 Collar 7.7.2.1 General Arrangement The collar shall be manufactured to meet the general arrangement shown on Standard Drawing No. 1416.

The collar shall prevent misalignment of the cover to the pit, allow height adjustment of up to 50 mm and allow some vertical rotation to suit the cross-fall of the finished surface level.

The collar shall be placed on the pit prior to compaction of the backfill material to prevent elongation of the top of the pit.

The collar shall be designed to facilitate a lockable cover but shall not impede cable installation.

7.7.2.2 Material The collar shall meet all requirements outlined below throughout its design life of 20 years.

Pit collars shall be manufactured from a highly durable material, shall be classified as having protection against solar radiation and be abrasion resistant to the satisfaction of the Superintendent. Hold Point 3

Collars shall have a protective treatment to prevent corrosion.

Where considered necessary by the Superintendent, collars shall be earthed by a non-ferrous earth wire in accordance with Standard Drawing No. 1416 and sized in accordance with AS 3000.

The collar is to be supplied complete with the earthing screw, washer and nut installed as per Drawing No. 1416.



December 07

7.7.2.3 Mechanical Strength The collar shall be capable of transferring the loading requirements specified in AS 3996 (Metal Access Covers, Road Grates and Frames) for Class B loading classification from the cover into the pit wall, eliminating the need for concrete surrounds.

12 off M16 bolts shall be used to fix the collar to the pit.

7.7.2.4 Weight The collar shall have a lifting weight of less than 40 kg.

7.7.3 Cover 7.7.3.1 General Arrangement The cover shall be manufactured to meet the general arrangement shown on Standard Drawing No. 1417.

For safety, security and protection it is a requirement that members of the public are unable to lift pit covers using their hands, feet or any equipment that might normally be carried on their person.

The lifting holes shall be designed to prevent entry of foreign objects (for example syringes) into the pit but allow soil to pass through so lifting is not impeded.

7.7.3.2 Material The cover shall meet all requirements outlined below throughout its design life of 20 years.

The cover shall be manufactured from a highly durable material, shall be classified as having protection against solar radiation and be abrasion resistant to the satisfaction of the Superintendent. Hold Point 4

The cover shall be made from a non-conductive material or have a protective coating applied in accordance with Standard Drawing No. 1417 to provide insulation against indirect contact with a live low voltage conductor.

The Contractor shall certify that the insulation resistance between the items specified above are not less than 1M Ohm when tested in accordance with Clause 6.3.3.3 of the Wiring Rules.

Coatings shall be tested for adhesion to the cover surface in accordance with AS/NS 1580.408.5 (Paints and Related Materials Method of Test Adhesion Pull off test). The Contractor shall provide certification from a suitably rated NATA laboratory that the adhesion value of all tests performed on the supplied coating is 1 Mpa or greater. Nonconformance

7.7.3.3 Mechanical Strength All covers shall conform to the loading requirements specified in AS 3996 (Metal Access Covers, Road Grates and Frames) for Class B loading classification.

7.7.3.4 Slip Resistance The top surface of all covers shall meet the requirements of AS 4586 (Slip Resistance Classification for New Pedestrian Surface Materials) and Table 3 of HB197 (An Introductory Guide to the Slip Resistance of Pedestrian Surface Materials) where the classification is for External colonnades, walkways and pedestrian crossings.

The slip resistance shall be evaluated in accordance with AS 4586 and HB197 where the nominated test method shall be either the Wet Pendulum Test Method in accordance with Appendix A of AS 4586 or the Oil Wet Ramp Test Method in accordance with Appendix D of AS 4586.

7.7.3.5 Weight Covers shall have a lifting weight of between 10 kg and 25 kg and shall not be hinged to a supporting frame or collar. Pit covers shall be designed such that water may escape without lifting the cover.

7.7.3.6 Locking mechanism Covers for circular pits shall be lockable and be fitted with a tamperproof mechanism, which can be locked and unlocked using the standard pit lifting device.



7.7.3.7 Marking Covers for pits forming a wiring enclosure for electrical cabling shall be marked with the word ELECTRICAL. Pit covers for pits forming a wiring enclosure for telecommunications cabling shall be marked with the word COMMUNICATIONS.

All lettering shall be uppercase, Arial font and have a minimum text height of 30 mm for ELECTRICAL and 20 mm for COMMUNICATIONS. The lettering shall be engraved, embossed, cast or otherwise made permanent and legible.

7.8 Rectangular Pits & Covers 7.8.1 Pit 7.8.1.1 General Arrangement Pits and covers shall be manufactured to the dimensions and arrangement shown on Figure 3, Figure 4 and Figure 5 in Appendix A.

7.8.1.2 Materials Pits shall be manufactured of materials capable of being buried without any damaging effects, or shall be treated for this purpose. Pits shall have smooth, internal walls.

Pits maybe manufactured from plastic or polycarbonate materials. Pre-cast and cast in-situ concrete pits are acceptable, subject to the approval of the Superintendent. Where used, the concrete shall have a minimum strength of 32 Mpa/28. All materials shall have protection against solar radiation.

7.8.1.3 Mechanical Strength of Pits The thickness and shape of the materials used to form the pit shall provide sufficient strength to support a wheel loading of at least 1 tonne, when installed in the ground with 2 holes in each side and each end of the pit as specified in Table 6.

Table 6 - Hole Requirements for Pits

Pit Type Maximum Hole Diameter (mm)

1 50

3 65

4 85

7, 8 100 One hole only

The thickness of the walls and bottom of the pit shall exhibit a shearing or cutting characteristic such that the holes specified above can be cut with a normally available hole saw or press to within 30 mm of the corners and/or edges.

7.8.1.4 Cable Supports Removable cable supports shall be provided for Type 7 and Type 8 pits.

7.8.2 Covers 7.8.2.1 General Arrangement The covers shall be manufactured from steel in accordance with Figure 3 and Figure 4, or square reinforced concrete (similar to Gatic-style covers) to the dimensions shown on the site-specific Drawings.

For safety, security and protection it is a requirement that members of the public are unable to lift pit covers using their hands, feet or any equipment that might normally be carried on their person.

The lifting holes shall be designed to prevent entry of foreign objects (for example syringes) into the pit but allow soil to pass through so lifting is not impeded. The lifting holes shall be compatible with the standard lifting device.

Square reinforced concrete covers shall be tapered to facilitate easy removal with a lifting device.



December 07

7.8.2.2 Material Pit covers and spacer bars shall be manufactured from a highly durable material, which has high ultra violet and abrasion resistance and will ensure the cover meets all the requirements outlined below throughout the entire 20-year design life of the cover.

The cover and spacer bars shall be made from a non-conductive material or have a protective coating applied in the same manner as shown on Standard Drawing No. 1417 to provide insulation against indirect contact with a live low voltage conductor.

The Contractor shall certify that the insulation resistance between the items specified above are not less than 1M Ohm when tested in accordance with Clause 6.3.3.3 of the Wiring Rules.

Coatings shall be tested for adhesion to the cover surface in accordance with AS/NS 1580.408.5 (Paints and Related Materials Method of Test Adhesion Pull off test). The Contractor shall provide certification from a suitably rated NATA laboratory that the adhesion value of all tests performed on the supplied coating is 1Mpa or greater. Nonconformance

7.8.2.3 Mechanical Strength All covers shall conform to the loading requirements specified in AS 3996 (Metal Access Covers, Road Grates and Frames) for Class B loading classification.

7.8.2.4 Slip Resistance The top surface of all covers shall meet the requirements of AS 4586 (Slip Resistance Classification for New Pedestrian Surface Materials) and Table 3 of HB197 (An Introductory Guide to the Slip Resistance of Pedestrian Surface Materials) where the classification is for External colonnades, walkways and pedestrian crossings.

The slip resistance shall be evaluated in accordance with AS 4586 and HB197 where the nominated test method shall be either the Wet Pendulum Test Method in accordance with Appendix A of AS 4586 or the Oil Wet Ramp Test Method in accordance with Appendix D of AS 4586.

7.8.2.5 Weight Covers shall have a lifting weight of between 10 kg and 25 kg and shall not be hinged to a supporting frame or collar. Pit covers shall be designed such that water may escape without lifting the cover.

7.8.2.6 Marking of Pit Covers Covers for pits forming a wiring enclosure for electrical cabling shall be marked with the word ELECTRICAL. Pit covers for pits forming a wiring enclosure for telecommunications cabling shall be marked with the word COMMUNICATIONS.

All lettering shall be uppercase, Arial font and have a minimum text height of 30 mm for ELECTRICAL and 20 mm for COMMUNICATIONS. The lettering shall be engraved, embossed, cast or otherwise made permanent and legible. The words shall be marked permanently on the top of the cover in the rectangular blank areas shown in Figure 3 and Figure 4.

7.8.2.7 Cover Support Bars Cover support bars shall be provided to support the cover where necessitated by the cover design and in accordance with Figure 3 and Figure 5. Cover support bars shall comply with requirements of Clause 7.8.2.2. Double piece covers shall be used for pit types 7 and 8. Where two covers per pit are used, the covers shall be identical in dimension and form.

7.9 Marker Tape Marker tape shall comply with the requirements of AS 2648.1.

7.10 Draw Rope Draw rope shall be a general-purpose synthetic polypropylene filament rope of minimum diameter of 4 mm.

Draw ropes manufactured from other materials may be used where approval has been obtained from the Superintendent. Hold Point 5

Wire or cable of any description shall not be used.



7.11 Cable Junction Enclosure Mounting Strap For circular pits the contractor shall supply and install a cable junction enclosure mounting strap in accordance with Standard Drawing 1418.

7.12 Bedding Sand Bedding sand shall comply with the requirements of Clause 20.3.5 of MRS11.04.

7.13 Granular Filter Material Granular filter material shall comply with the requirements of Clause 20.3.7 of MRS11.04.

7.14 Concrete Concrete shall comply with the requirements of MRS11.70.

7.15 Backfill Dry stabilised sand for backfill shall comply with the requirements of Clause 20.3.10 of MRS11.04.

8 APPROVAL OF MATERIALS The Contractor shall submit all technical details of proposed materials for approval not less than 14 days prior to the purchase and delivery to site of all materials. Such a submission shall include, but not be limited to, pits, sand, granular fill, backfill, conduits and conduit bends. Materials shall not be used prior to the approval of the Superintendent unless the materials have been previously approved by the Principal as a Standing Offer Arrangement item. Hold Point 6

The Contractor may be required to submit production samples. These shall be delivered at the Contractors cost, suitably packaged and labelled.

Production samples may be held by the Superintendent throughout the period of the contract for the purpose of providing reference against which all subsequent items may be gauged for compliance with this specification.

9 EXCAVATION FOR UNDERGROUND CONDUITS AND PITS 9.1 GENERAL Excavation for conduits and pits shall be carried out in accordance with the requirements of MRS11.04.

Excavation for conduits and pits shall be classed as confined excavation as defined in MRS11.04. Care shall be taken to minimise disturbance to existing work consistent with complying with the minimum clearances stated in this specification.

The contractor shall identify underground services in the proposed excavation area. No pits shall be installed in vehicle paths, roadways, driveways, drain inverts, bikeways, ramps, pedestrian alignments or wheelchair access pathways or ramps. All pit locations are to be pegged by the contractor and 24 hours notice given to the Superintendent to approve the locations prior to construction. Hold Point 7

9.2 Trench Width Trenches shall be installed as per standard drawing number 1149. Trench widths less than those specified in the standard drawing may be used where the approval has been obtained from the Superintendent for each instance.

9.3 Trench Walls The trench walls shall be cut vertical to within a tolerance of 1 in 10 from vertical.

9.4 Bottom of Trench The bottom of the trench shall be compacted and bedded where necessary, to form a firm uniform surface free from loose material. Witness Point

9.5 Timing of Excavation When excavating a trench in new roadwork, trenching operations shall be carried out after compaction of the earthworks and prior to the placement of any pavement material or surface finish.



December 07

9.6 Existing Pavement Where trenching is carried out across an existing paved surface, the surface shall be pre-cut in a straight line to the minimum width required so as to minimise reinstatement work.

9.7 Boring and/or Jacking Boring and/or jacking of conduit shall be carried out by experienced operators using purpose made equipment which is capable of maintaining correct line and levels of completed conduits. Hold Point 8

Excavation of working spaces to assist in boring and/or jacking operations shall be kept to a minimum and such working spaces shall be reinstated to as-found condition after completion of conduit installation.

9.8 Excavated Material The excavated material shall be placed well clear of the trench. If topsoil is required to be reused it shall be kept separate from the remainder of the excavated material.

9.9 Trench Depth 9.9.1 General The depth of the trench shall be such as to provide for the required cover for the conduits and conduit fittings, as defined below.

9.9.2 Minimum and Maximum Cover The minimum cover as shown on Standard Drawing 1149 shall be provided for conduit.

The maximum cover shall be such that the conduit depth shall not be greater than the depth of the appropriate pit entry.

9.10 Surplus Excavated Material Surplus excavated material shall be used or disposed of in accordance with the requirements of Clause 12 of MRS11.04.

10 INSTALLATION OF CONDUITS 10.1 General The installation of conduits shall conform to the requirements of Standard Drawing 1149. The installation of communications conduits shall also comply with AS/ACIF S009.

10.2 Location Conduits shall be installed in the location shown on the Drawings or described elsewhere in the Contract. The contractor shall peg the conduit route for approval by the Superintendent. The locations of conduits shown on the drawings are indicative only and shall not be scaled from the drawings. Hold Point 9

The Contractor shall give a minimum 48 hours notice to the Superintendent prior to installation of conduits. Witness Point

The Contractor shall give 24 hours notice to the Superintendent when seeking approval for any proposed variation to the location of the conduits. Nonconformance Hold Point 10

10.3 Conduit Bore After installation, all conduits shall be free from foreign matter and from rough edges and projections, which could damage the cable during installation.

The diameter of the bore shall be unaltered at bends and fittings.

10.4 Road Crossings Unless otherwise specified, road crossings must consist of at least one 100 mm power conduit and one 100 mm communications conduit.



10.5 Changes in Levels or Direction of Conduit Where the level or direction of conduit conflicts with that of other facilities, the level or direction of the conduit may be altered, subject to the approval of the Superintendent. In all cases the specified minimum cover shall be maintained. Nonconformance

10.6 Bends 10.6.1 Use of Bends The use of bends, other than as shown on the Drawings or Standard Drawings shall be at the discretion of the Superintendent. Changes in level or direction between pits to avoid conflicts with other features may be accomplished by the use of bends with approval of Superintendent. Hold Point 11

10.6.2 Bends for Road Crossing Conduits Road crossing conduits are shown and defined in Figure 1. Changes in level or direction for road crossing conduits may be accomplished by the use of standard preformed bends as shown in Table 7.

No more than 180 degrees of total change in direction shall be installed between pits or junction boxes. Any greater change will require the approval of the Superintendent.

Conduit bends for road crossings to be cast in structures or concrete barriers shall comply with Table 8.

Table 7 - Radius of Curvature & Bend Angles for Road Crossing Conduits

Conduit diameter (mm)

Minimum Radius of Curvature (mm)

Maximum Angle of Bend (Degrees)

100 600 90

80 600 90

50 300 90

20 150 90

10.6.3 Bends for Backbone Conduits Backbone conduits are shown and defined in Figure 1. Changes in level or direction for backbone conduits may be accomplished by the use of a standard preformed bend as shown in Table 8.

No more than 90 degrees of total change in direction shall be installed between pits or junction boxes. Any greater change will require the approval of the Superintendent. A maximum of two bends shall be installed in any 4 m distance of conduit run.

Conduits may be cold bent to an offset of no more than 250 mm in any 4.0 m length. However any cold bend shall have a radius no less than 10.0 m. Nonconformance

10.7 Bedding of Conduit Conduit shall be bedded on bedding sand as shown on Standard Drawing number 1149.

10.8 Conduit at Pits Conduit entering and exiting a pit shall conform to the locations and dimensions shown on the Standard Drawing 1415 and Figure 2. Conduits shall protrude into rectangular pits at least 50 mm and not more than 100 mm.

Table 8 - Radius of Curvature and Bend Angles for Backbone Conduits

Conduit diameter (mm)

Minimum Radius of Curvature (mm)

Maximum Angle of Bend (Degrees)

100 760 22.5

80 600 22.5

50 450 22.5



December 07

Conduits shall enter and exit a pit at the same height and orientation where practicable.

With the exception of road crossing conduits or as otherwise specified the conduits shall enter and exit the ends of the pits.

Any variation from this is to be approved by the Superintendent prior to construction. Hold Point 12

10.9 Shared Trenches and Adjacent Conduits Adjacent sections of conduit may be placed in the one trench provided that minimum clearances shown on Standard Drawing Number 1149 are maintained between conduits.

Conduit for telecommunication cabling and conduit for electrical cabling may be installed in the same trench, provided that the requirements of AS/ACIF S009 are met.

Where conduit for telecommunication cabling and conduit for electrical cabling are installed in shared trenches, one type of conduit shall be installed exclusively on one side of the trench and the other on the other side of the trench, in order to provide maximum separation.

10.10 Marking Tape The communications and electrical marker tapes shall be laid between 180 mm and 200 mm above the conduit and conduit bends for the respective services and above any mechanical protection provided. The marker tapes shall be installed in accordance with Standard Drawing Number 1149 and AS/ACIF S009.

Marking tape is not required if the conduits have been installed by boring and/or jacking.

10.11 Jointing 10.11.1 General All joints in conduits and conduit bends shall be made such that ingress of sand and soil is prevented. Conduits manufactured from dissimilar materials shall by joined in accordance with Clause 7.2.5 or Clause 7.3.4 as appropriate.

10.11.2 Non-metallic Conduit Non-metallic conduit and conduit bends shall be joined using an approved priming fluid and solvent cement. The jointing technique shall be subject to the approval of the Superintendent. Witness Point

10.11.3 Metallic Conduit Metallic conduit and conduit bends shall be joined using a threaded coupling. The minimum length of thread on each tube shall be 25 mm.

10.11.4 Flexible Conduit Flexible conduit must be joined using proprietary fittings.

10.12 Draw Rope Draw ropes shall be installed in the conduits and have a minimum of 1.5 m excess length in each pit. Rope ends shall be firmly secured to prevent the ends being lost in the conduit.

Where the conduit does not terminate at the pit, the draw rope shall be tied to a marker peg with approximate cross section 100 mm x 100 mm and not less than 400 mm long, driven firmly into the ground with the top 50 mm projecting above the finished surface and painted yellow.

The termination of a conduit without pit is subject to approval by the Superintendent. Nonconformance

Any joints made in the draw rope shall be capable of resisting the same tensile load as the rope without a joint. The joint shall not appreciably increase the diameter of the rope.

10.13 Conduit Plugs / Bungs Polystyrene bungs or PVC caps shall be installed as soon as practicable after installation on all unused conduits to prevent extraneous material entering the conduit. Plugs and bungs shall be fixed with easily removed adhesive such as silica beading to prevent inadvertent removal.

10.14 Conduits Encased in Concrete in a Structure / Barrier Conduits and conduit bends encased in concrete in a median barrier shall be installed as shown on the Drawings.



10.15 Surface Mounted Conduits Conduits and conduit bends installed on a surface shall be installed using the materials as shown on the Drawings. Elbow and tee fittings with inspection plates may be installed on a surface mount installation in accordance with Section 7.2.1.

Fixing brackets and/or anchors, where supplied by the Contractor, shall be manufactured in accordance with the Drawings.

Prior to drilling into existing concrete structures the contractor shall locate reinforcement and built-in items that are not to be damaged. Tensional beams shall not be drilled. Masonry anchors shall be installed in accordance with the manufacturers recommendations. Drilling into existing concrete shall not commence prior to the approval of the Superintendent. Hold Point 13

Conduit shall be installed in straight lines or to follow the kerb line on a curved structure as shown on the Drawings to the satisfaction of the Superintendent. Conduit and fixings shall be installed so as to avoid catch points for clothing or the human body.

10.16 Flexible Conduit in Concrete Where prior approval is given by the Superintendent, flexible conduit may be used to construct a duct less than 2 m in length to join rigid conduits through a continuous pour of Class 25 MPa/20 concrete. Hold Point 14 The concrete shall provide a minimum radial thickness greater than 75 mm around the conduit, and retain Category A wiring system rating as defined in the Wiring Rules.

The radius of curvature of the installed conduit shall be confirmed as not less than that specified in Table 8. Witness Point

11 INSTALLATION OF PITS 11.1 General The installation of pits shall conform to the requirements of Standard Drawings 1314, 1415 and Figure 1 and Figure 2.

Prior to the issue of Certificate of Practical Completion, all pits shall be cleared of debris to the satisfaction of the Superintendent.

11.2 Location Pits shall be installed at the locations shown on the Drawings. The locations of the pits shown on the drawings are indicative only and shall not be scaled from the drawings. The contractor shall peg the locations of the pits for approval by the Superintendent. Hold Point 15

Additional pits shall be provided to limit the number of bends as detailed in Section 10.6. Wherever practical, pits shall be installed adjacent to field equipment and generally spaced no more than 120 m apart or at the discretion of the superintendent.

Where specified, maintenance marker posts are to be installed to assist in the locating of pits in remote areas. The posts shall protrude 1500 mm above ground level and be identified with durable retro-reflective black and yellow stripe material.

11.3 Numbering of Pits Where specified, pits shall be numbered in accordance with the Drawings or schedule provided by the Principal.

11.4 Bedding of Pit Before a pit is installed, the soil under the pit location shall be compacted to 95% RDD.

Pits shall be bedded on granular filter material as shown on Standard Drawing number 1314. Granular filter material shall be compacted to a density index of not less than 60.

11.5 Finished Surface Level Pits shall be installed such that the top edge of the pit coincides with the plane of the finished surface level.



December 07

11.6 Entry of Conduit Holes to allow conduit entry to the pit shall be made using a hole saw of the same external diameter as the conduit. Conduit entries shall be in accordance with Standard Drawing 1415 and Figure 2. With the conduit in place, the joints between the conduit and the pit shall be sealed such that ingress of sand and soil is prevented.

Conduits shall be installed as per Section 10.8 unless otherwise approved by the Superintendent prior to construction. Nonconformance

11.7 Installation of Pit over Existing Conduit The installation of a pit over existing conduits is subject to the approval of the Superintendent. Nonconformance

11.8 Drainage All pits shall be provided with drainage holes in the bottom and the lowest pits in each conduit system shall be drained as shown on the Drawings or Standard Drawing 1314.

Conduit systems and finished surface levels shall be installed so as to drain and direct water away from field equipment.

Conduit systems shall also be installed so as to drain from pits immediately linking to field equipment. The lowest edge of conduits installed in poles and other field equipment enclosures shall be 50 mm higher than the surrounding finished surface level.

11.9 Pits installed on Batter Slopes Pits shall NOT be installed on slopes greater than 1:3 except where approved by the Superintendent. Hold Point 16

Where pits are installed on batters with slopes greater than 1:3, the surface of the batter from the nearest access point (eg the roadway or shoulder) shall be treated so that no loose material is, or could become, present.

12 BACKFILLING 12.1 General Backfilling shall be carried out in accordance with the requirements of Clause 20 of MRS11.04.

Backfilling of trenches to cover conduit and conduit fittings with any material shall not commence until the Superintendent has approved the works. Witness Point

Conduit shall be backfilled in accordance with the details shown on Standard drawing number 1149.

12.2 Pits Rectangular pits shall be backfilled with dry stabilised sand in accordance with the details shown on Standard Drawing number 1314. Round pits shall be backfilled with the excavated material.

12.3 Precautions Against Damage or Movement During backfilling operations all necessary precautions shall be taken to protect the conduit and pits from any damage or movement. Witness Point

The initial layer of backfill shall be rammed carefully around the conduit so as to cause no distortion of the cross section of the conduit.

12.4 Roadways Conduits in roadways shall be constructed as detailed on Standard Drawing Number 1149.

12.5 Footways Conduits in footpaths shall be constructed as detailed on Standard Drawing Number 1149.



13 SURFACE TREATMENT Rectangular pits shall be provided with a surface treatment as shown on Standard Drawing Number 1440, except as follows

a) Where dry stabilised sand backfill for the pit is extended to the surface and used as the surface treatment, it must be as per dimensions shown on Standard Drawing Number 1440 except with 300 mm minimum depth; or

b) Where the surrounding surface provides at least the same protection as the concrete surround as shown on Standard Drawing Number 1440, the surface may be extended in a continuous manner to surround and mate with the pit.

A surface treatment that blends with the surrounding surface(s) shall be provided for circular pits.

In all cases, the surface treatment must provide a smooth, free draining finish that will not present a trip hazard. Wherever possible, the surface treatment shall be sloped to direct water away from the pit.

14 ABANDONED CONDUITS All abandoned conduits shall be capped and glued with a proprietary PVC conduit cap.

15 HANDLING, PACKAGING, STORAGE AND DELIVERY Supply, handling, storage and delivery of all materials shall be in accordance with the requirements of MRS11.01.

Conduit and conduit fittings not protected against solar radiation shall be stored under cover to prevent damage by solar radiation.

Materials and equipment damaged prior to, and/or during installation must not be used.



December 07

MRS11.91

Ducts and Pits

Appendix A

Ducts & Pits Layout Cable Jointing Pits and Covers Dimensions



MRS11.91 Ducts and Pits Appendix A

Ducts & Pits Layout

Cable Jointing Pits and Covers Dimensions

Table of Contents

Figure Number Title 1 Backbone and Road Crossing Conduits 2 Conduit Entry Details into Circular Pits 3 Cable Joining Pit Cover Types 3, 4, 7 and 8 4 Cable Joining Pit Cover Type 1 (J) 5 Cable Pit - Types 1 (J), 3, 4, 7 and 8


Page 3 of 7 MRS11.91.A

December 07

Figure 1 - Backbone and Road Crossing Conduits



Figure 2 - Conduit Entry Details into Circular Pits



December 07

Figure 3 - Cable Joining Pit Cover Types 3, 4, 7 and 8



Figure 4 - Cable Joining Pit Cover Type 1 (J)



December 07

Figure 5 - Cable Pit - Types 1 (J), 3, 4, 7 and 8

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