204189355 electrical safety clearance

7/26/2019 204189355 Electrical Safety Clearance

1/23

Electrical Safety Clearance (Part-1)

AUGUST 8, 20129 COMMENTS

Standard: Qatar General Electricity & Water Corporation

Minimum Safety Clearance of Pipelines from Electrical Tower:

DescriptionVoltage

33KV/66KV/132KV 220KV/400KV

The right of way(ROW) (widths oneither side of the

center line of

overheadtransmission lines

)

25 Meter 50 Meter

Other than the

roadways andboundary fences ofsecurityestablishmentsany temporary or

permanentstructures /buildings, parapet

walls,

Not within 25 MeterNot within 50

Meter

With All

Underground

services crossing

the way leave(from the nearest

tower foundation)

35 Meter (Min) 50 Meter (Min)

The nearest side of

the road

reservation to thenearest towerfoundation

25 Meter35 Meter,50

Meter

The pipelines(water, oil/gas

etc.) crossing

(respectively awayfrom the nearest

base of tower leg).Pipe-lines shall not

be laid parallel tothe overhead line

within the limits of

a way leave(ROW).

25 Meter (Min)35 Meter(Min),50 Meter(Min)
http://electricalnotes.wordpress.com/2012/08/08/electrical-safety-clearance-part-1/#commentshttp://electricalnotes.wordpress.com/2012/08/08/electrical-safety-clearance-part-1/#commentshttp://electricalnotes.wordpress.com/2012/08/08/electrical-safety-clearance-part-1/#commentshttp://electricalnotes.wordpress.com/2012/08/08/electrical-safety-clearance-part-1/#comments


2/23

Cables crossing

the transmissionlines way leave(ROW)

respectively away

from the nearest

base of tower leg.

25 Meter35 Meter,50

Meter

Foundations andcivil structures(Temporary or

permanent) will

not be permittedin the close

proximity to the

cable circuit. Aminimum

horizontal distancefrom such

structures to thenearest edge of

the cable trenchshall be observed

Min 1.5 Meter Min 1.5 Meter

Clearance among Electrical Line-Telephone- Water-Sewerage -Gas Line

Service VerticalClearance(Min)

Water Line (to cross below EHV cablelevel)

0.5 Meter

Sewerage Mains (to cross below EHV

cable level)

1.0 Meter

Drainage Mains (to cross below EHVcable level)

0.5 Meter

Gas pipes 0.6 Meter

Telephone lines 0.5 Meter

LV / 11kV cables 0.5 Meter

Safety Clearance for Excavation of Land :

Type of Excavation Distance

Use of heavy mechanical

excavators (other than handoperated pneumatic jackhammers) or driving sheet piles

Not less than 3 Meter from

the edge of cable, cover,cable joint

Heavy machinery engaged in the

civil construction or road works

operating load/thrust/weight will not be applied

directly on the cable

installation

Trench excavations parallel to Minimum separation of 1


3/23

the cable installations Meter to the nearest edge

of cable tile

Laying of metal pipes over a long

distance parallel to cable

Not permitted unless the

Step and Touch Potentials

at any point of the pipe line

do not exceed 65 Volts.(A) Inside Towns

Distance between Towers foundation to Pipeline in parallel and intersections.

Voltage Min Distance

380/220V 0.5 Meter

20KV 2 Meter

63KV 7 Meter

132KV 10 Meter

230KV and Above 20 Meter

Distance between underground power cables to wall of gas pipelines in parallelroutes.

Voltage Min HorizontalDistance

Min VerticalDistance

380/220V 1 Meter 0.5 Meter

20KV 2 Meter 1 Meter

63KV 3 Meter 1.5 Meter

(B) Outside of Towns:

Distance between Towers foundation to Pipeline in parallel and intersections.

KVMin Distance in

Parallel Route (Up to5 Km)

Min Distance inParallel Route(Above 5 Km)






Distance between overhead lines to gas pipelines at intersections.

KV Min Distance

20KV 8 Meter

63KV 9 Meter

132KV 10 Meter

230KV 11 Meter


4/23

400KV 12 Meter

Distance between Towers foundations to gas pipelines at intersections.

KV Min Distance

20KV 20 Meter

63KV and Higher 30 Meter

Right Of Way (R.O.W) From Roads:

Highway Distance

High Way : (38 meter from one side of Central

Line of Highway)76 Meter

First Class State Road=(22.5 meter from one

side of Central Line of Highway)

45 Meter

Second Class State Road=(17.5 meter from oneside of Central Line of Highway)

35 Meter

Third Class State Road =(12.5 meter from oneside of Central Line of Highway)

25 Meter

Forth Class State Road=(7.5 meter from one

side of Central Line of Highway)

15 Meter

General Electrical Safety Clearance:

KV Description Distance

Up to 11

KV

At points where thelines cross roads or

railwaysMin 6 Meter Height

Up to 11

KVparallel to roads the Min 5.5 Meter Height

Up to 11

KV

lines cross totallydesert regions whereno traffic is possible

Min 5.5 Meter Height

20 KV to66 KV

All Location Min 6 Meter Height

Up to 11KV

Conductor JointNo joint shall be closer

than 3 meters to apoint of support

33 KV & 66

KV

Conductor Joint No tension joints shall

be used unlessspecially approved.


5/23



Code: Indian Electricity Rules/ Central Electricity Authority:

Right of Way Clearance (As per GETCO Standard):

KV Min ROW

66 KV 18 Meter

132 KV 27 Meter

220 KV 35 Meter

400KV 52 Meter (Single Circuit)

400 KV 48 Meter (Double Circuit)

Minimum clearances between Electrical Lines crossing each other:

Voltage 66 KV132

KV

220

KV

400 KV

66 KV2.4

Meter3 Meter 4.5

Meter5.4

Meter

132 KV 3 Meter3 Meter 4.5

Meter

5.4

Meter

220 KV4.5

Meter

4.5

Meter

4.5

Meter

5.4

Meter

400 KV4.5

Meter

5.4

Meter

5.4

Meter

5.4

MeterPermissible Min ground Clearance of Electrical Line:

KV Ground ClearanceOver National

Highway

66 KV 6.1 Meter 8.0 Meter



400KV 8.8 Meter 10.8 Meter

Clearance for Telephone line Crossings Power Line:

KV Clearance (Min)

66 KV 2.4 Meter

132 KV 2.7 Meter

220 KV 3.0 Meter

Vertical Clearance between Electrical Line and railway tracks.

KV Clearance (Min)


6/23

66 KV 14 Meter

132 KV 14.6 Meter

220 KV 15.4 Meter

400 KV 17.9 Meter

Clearance from Buildings to low, medium & high voltage lines:

Voltage Description Distance

Low &

MediumVoltage

Flat roof, open balcony,

verandah roof ,When the linepasses above the building avertical clearance from the

highest point

2.5 Meter

Low &Medium

Voltage

Line passes adjacent to thebuilding a horizontal

clearance from the nearestpoint

1.2 Meter

Low &Medium

Voltage

Line passes above thebuilding a vertical clearance

2.5 Meter

Low &Medium

Voltage

Line passes adjacent thebuilding a Horizontal

clearance

1.2 Meter

11 KV to 33

KV

Line passes above or

adjacent to any building orpart of a building

3.7 Meter

Above 33

KV

Line passes above or

adjacent to any building orpart of a building

3.7+(0.3 for

everyadditional 33KV )

Up to 11 KV The horizontal clearance

between the nearerconductor and any part of

such building

1.2 Meter

11 KV to 33

KV

The horizontal clearance

between the nearerconductor and any part of

such building

2.0 Meter

Above 33 The horizontal clearancebetween the nearer

2.0 + (0.3 forevery


7/23

KV conductor and any part

ofsuch building

additional 33

KV )

Clearance above ground at the lowest conductor:

Voltage Description Distance

Low & MediumVoltage

Across a street 5.8 Meter

High Voltage Across a street 6.1 Meter

Low & Medium

Voltage

Along a street 5.5 Meter

High Voltage Along a street 5.8 Meter

Low & MediumVoltage Elsewhere than alongor across any street 4.0 Meter

High Voltage Elsewhere than alongor across any street

5.2 Meter

33 KV & EHV Clearance above

ground(Add 0.3 Meter

for every 33 KV Voltsin 5.2 Meter)

Min 6.1

Meter

Vertical Clearance at Middle of Span:

SpanVertical Clearance (At Middle of

Span)

200 Meter 4.0 Meter

300 Meter 5.5 Meter

400 Meter 7.0 Meter

500 Meter 8.5 Meter

Safety Clearance from Live Part in Outdoor Substation:

KV Safety Working Clearance

12 KV 2.6 Meter

36 KV 2.8 Meter

72.5 KV 3.1 Meter

145 KV 3.7 Meter

220 KV 4.3 Meter

400KV 6.4 Meter


8/23

800 KV 10.3 Meter

Lying of Telecommunication Cables with Power Cables (>33 kV).

Cable Min. Distance

Power cable of voltage exceeding

33 kV shall be laid

Min 1.2 Meter depth

Underground telecommunicationcable shall be with underground

power cable of voltage exceeding

33 kV.

Min 0.6 Meter Separatefrom Power Cable

Safe approach limits for people:

Voltage

214V

to

415KV

11KV 33KV 66KV 132KV 275KV

Person

usingmanually

operated

tool

1.3

Meter

2.0

Meter

3.0

Meter

4.0

Meter

5.0

Meter

6.0

Meter

Personusing

poweroperated

tool

3.0Meter

3.0Meter

3.0Meter

4.0Meter

5.0Meter

6.0Meter



Standard:Northern Ireland Electricity (NIE), 6/025 ENA

Clearances of Electrical Line to Ground and Roads:

Description

ofClearance

0.4KV

11KV

33KV 110KV220KV

400KV

Lineconductor toany point

not over

road

5.2Meter

6.1Meter

6.4Meter

6.4Meter

7.0Meter

7.0Meter

Line

conductor toroad surface

5.8

Meter

6.1

Meter

6.4

Meter

6.4

Meter

7.4

Meter

8.1

Meter


9/23

Line

conductor toroad surfaceof high load

routes

6.9

Meter

6.9

Meter

6.9

Meter

7.2

Meter

8.5

Meter

9.2

Meter

Bare livemetalwork (

transformerterminals,jumper

connections,

etc)

4.6Meter

4.6Meter

4.6Meter

- - -

Clearances of Electrical Line to Other Objects:

Description

of

Clearance


10/23

Line

conductorsto irrigates,slurry guns

and high-

pressure

hoses

30

Meter

30

Meter

30

Meter

30

Meter

30

Meter

Lineconductorsto playing

fields

8.5Meter

8.5Meter

8.5Meter

8.5Meter

8.5Meter

Lineconductors

to CaravanSites

9.0Meter

9.0Meter

9.0Meter

9.0Meter

9.0Meter

Horizontal

clearancesto wells

15.0

Meter

15.0

Meter

15.0

Meter

15.0

Meter

15.0

Meter

Clearances of Electrical Line to Trees and Hedges:

Description

ofClearance


11/23

metalwork

to treesfallingtowards the

overhead

line with the

lineconductors

hangingvertically.

Line

conductorsto trees in

Orchards

3.0

Meter

3.0

Meter

3.4

Meter

4.6

Meter

5.3

Meter

Clearances of Electrical Line to Street Lighting:

Descriptionof

Clearance

0.4

KV

11

KV33KV 110KV

220

KV400KV

Lineconductor toLantern on

same pole

1.0Meter

- - - - -

Bare line

conductor tolantern or

columnbelow.

1.5

Meter

- - - - -

Insulatedline

conductor to

column

0.3Meter

- - - - -

Insulatedline

conductor tolantern

1.0Meter

- - - - -

Column to

nearest LV

pole

1.5

Meter

- - - - -

Lineconductor to

street

lightingcolumn with

(i) Column

in normalupright

- 1.7

Meter

1.7

Meter

2.3

Meter

3.3

Meter

4.0

Meter


12/23

position.

(ii) Columnfalling

towards line

with line

conductorhanging

verticallyonly

- 1.7Meter

1.7Meter

2.3Meter

3.3Meter

4.0Meter

(iii)Column

fallingtowards line

- 0.4

Meter

0.4

Meter

0.8

Meter

1.4

Meter

1.9

Meter

Clearances of Electrical Line to Waterways:

Description

of Clearance0.4

KV

11

KV33KV 110KV

220

KV400KV

NavigableWaters:Lowerbank to

conductor or

earth wire

10.5Meter

10.5Meter

10.5Meter

10.5Meter

10.5Meter

10.5Meter

MinorWatercourses

:Lower bank toconductor or

earth wire

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

Clearances to Railways:

Descriptionof

Clearance

0.4

KV

11

KV33KV 110KV

220

KV400KV

Lineconductor toground level

6.1Meter

6.1Meter

6.1Meter

6.7Meter

7.0Meter

7.6Meter

Lineconductor to

ground level

on or acrossvehicle

parks

7.6Meter

8.5Meter

8.5Meter

9.1Meter

9.4Meter

10.1Meter

Lineconductor to

ground level

at roads andyards,where road

mobile

10.7Meter

10.7Meter

10.7Meter

11.2Meter

11.5Meter

12.2Meter


13/23

cranes are

likely to beemployed

Line

conductor to

Rail level

7.3

Meter

7.3

Meter

7.3

Meter

8.0

Meter

8.2

Meter

8.8

Meter

Lineconductor tothe level of

buildings,

gantries orotherstructures

(includingthose

carryingtraction

wires) onwhich a man

may be

3.0Meter

3.0Meter

3.0Meter

3.7Meter

4.6Meter

6.1Meter

Lineconductor to

poles and

otherprojections.

2.4Meter

2.7Meter

2.7Meter

3.0Meter

3.7Meter

5.5Meter

Lineconductor to

any otherwire other

thantraction

wires.

1.8Meter

1.8Meter

1.8Meter

2.4Meter

3.0Meter

3.7Meter

Clearances of Electrical Line to Fuel Tanks:

Descriptionof

Clearance

0.4

KV

11

KV33KV 110KV

220

KV400KV

Horizontalclearance

from line

conductors

to petroltanks andvents

15

Meter

15

Meter

15

Meter

15

Meter

15

Meter

15

Meter

Horizontal

clearance

from lineconductorsto liquid gas


14/23

tanks

(1) 459 to2273 litre

capacity

3.0Meter

3.0Meter

3.0Meter

3.4Meter

4.6Meter

5.3Meter

(2) 2274 to

9092 litre

capacity

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

7.6Meter

(3) More

than 9093litre.

15

Meter

15

Meter

15

Meter

15

Meter

15

Meter

15

Meter

Vertical

clearancefrom lineconductors

to fuel oiltanks

Please refer Clearances to Objects

Clearances of Electrical Lines to other Electrical Lines:

Descriptionof

Clearance

0.4

KV

11

KV33KV 110KV

220

KV400KV

Lowest line

conductor or

earth wireof upper line

to highest

lineconductor of

lower line.

1.0

Meter

1.8

Meter

2.0

Meter

2.5

Meter

3.7

Meter

4.4

Meter

Lowest lineconductor orearth wire

of upper lineto earthwire of

lower linewhereerected.

0.7

Meter

1.4

Meter

1.6

Meter

2.5

Meter

3.7

Meter

4.4

Meter

Lowest lineconductor orearth wire

of upper lineto any pointon a support

of the lower

line onwhich aperson may

2.7Meter

2.8Meter

3.0Meter

3.4Meter

4.6Meter

5.3Meter


15/23

stand.

Support ofupper line

and any

conductor of

lower line.

7.5

Meter

7.5

Meter

7.5

Meter

15

Meter

15

Meter

15

Meter

Vertical Passing Clearance (sites where vehicles will pass below the lines):

Description of

Clearance 1 KV 2.0 Meter

Above 110 KV All 2.5 Meter

Vertical Distance between Conductors of different Circuit (On Different Support):

Higher Voltage of either

Circuit Distance between Circuits

< 1 KV 0.6 Meter

1 KV to 33 KV 1.2 Meter


110 KV 2.4 Meter

220 KV 2.8 Meter


16/23

Distance between Conductors (Taken down from Pole to other Support, on

Transformer):

Voltage Distance between Circuits

11 KV & LV Line 0.60 Meter



Horizontal Distance of Telecommunication Line & Overhead Line:

Description of Clearance Distance

Telecommunication Line(Not insulated) to HVLine

Min 1.6 Meter

Telecommunication Line (Bare) to LV (Bare)Line

Min 1.2 Meter

Telecommunication Line (Covered) to LV (Bare)Line Min 0.6 Meter

Telecommunication Line (Bare) to Stay (Bare)

Wire

Min 0.3 Meter

Passage Way for Metal clad Switchgear:

Description of Clearance Distance

Clean &unobstructed Passages at the front of

any Low/High Voltage Switchgear.

1.0 Meter wide

& 2.5 Meter

high

Clean &unobstructed Passages at side or

under any earthed enclosure containing BareConductor

0.8 Meter wide

& 2.2 Meterhigh

Safe approach distance for Person from Exposed Live Parts:

Circuit Voltage Distance

< 1 KV 0.5 Meter

11 KV 1.5 Meter

22 KV 2.0 Meter

33 KV 2.5 Meter

66 KV 3.0 Meter

110 KV 4.0 Meter

>220 KV 6.0 Meter


17/23



Standard: ETSA Utilities

Vertical Clearances between Services:

Service LV Cable HV Cable

Common Pipe 0.100 Meter 0.100 Meter

Gas Pipe 0.200 Meter 0.200Meter

Sewer Pipe 0.300 Meter 0.300 Meter

Water Pipe 0.600 Meter 0.600 Meter

Horizontal Clearances between Services:Service LV Cable HV Cable

Common Pipe 0.100 Meter 0.100 Meter

Gas Pipe 0.200 Meter 0.200 Meter

Sewer Pipe 1.0 Meter 1.0 Meter

Water Pipe 0.600 Meter 0.600 Meter

Standard: UK Power Networks EI 02-0019

Cable Installation Depths:

Voltage AreaDepth(min)

LowVoltage

Footways, grass verges or private

property

0.450

Meter

Carriageways (including road

crossings)

0.600

Meter

Normal agricultural land (not deepploughing)

1.0 Meter

Agricultural land subject to deep

ploughing1.2 Meter

11 KV to20 KV

Footways, grass verges or privateproperty

0.600Meter

Carriageways (including roadcrossings)

0.750Meter

Normal agricultural land (not deep

ploughing)1.0 Meter


18/23


ploughing1.2 Meter

33 KV to132 KV

Footways, grass verges or private

property

0.900

Meter

Carriageways (including road

crossings)

0.900

Meter

Normal agricultural land (not deepploughing)

1.0 Meter

Agricultural land subject to deepploughing

1.2 Meter

AuxiliaryMulti-

core &Multi-

pairCables

Footways, grass verges or privateproperty

0.450Meter

Carriageways (including roadcrossings)

0.600Meter

Normal agricultural land (not deepploughing) 1.0 Meter


ploughing1.2 Meter

OnCable

Ladderfor LV to

HV

The Horizontal clearance betweencables on cable ladders

2X Dia of

Cable of

LargestCable ormin 150

mm

The clearance from a supporting wall 20 mm

The vertical clearance between cablesis greater

150 mm

If the number of cables > 4, they areto be installed in a horizontal

Minimum Approach Distance of Crane or Moving Part from Live Conductor:

Voltage

Without Safety ObservationFor

ordinaryPerson

Un

insulated

portions

Insulatedportions

Upto1KV 2 Meter 1.0 Meter 3.0 Meter

11 KV 2 Meter 1.4 Meter 3.0 Meter

22 KV 2.4 Meter 2 Meter 3.0 Meter



132 KV 3.0 Meter 3.0 Meter 3.0 Meter


19/23




Minimum Fixed Clearances for Electrical Apparatus (Isolation Points):

Voltage Fixed Clearance

Up to 11Kv 0.320 Meter

11KV to 33KV 0.320 Meter





Standard: New Zealand Electrical Code:

Min Safe Distance between Buildings and Overhead Line:

Voltage Pole Tower

11 kV to 33 kV 2 Meter 2 Meter

33 kV to 66 kV 6 Meter 6 Meter

66 kV and Above 8 Meter 8 Meter

Min Safe Distance for excavation near Overhead Line:

Description of ClearanceFromPole

(Min)

FromTower

(min)

Excavation in land more than 750mm

depth8 Meter

12

Meter

Excavation in land up to750mmdepth

2.2 to 5Meter

6 to12Meter

Excavation in land up to300mmdepth 2.2 Meter 6 Meter

Construction near 11KV to 33KV Line 2.2 Meter 6 Meter

Construction near 33KV to 66KV Line 6 Meter 9 Meter

Construction near 66KV and more8 Meter

12Meter

Wire Fence near 1KV to 66KV Line 2.2 Meter 2.2


20/23

Meter

Wire Fence near 66KV and more 5 Meter 5 Meter

Min Safe Distance for Tower Carin near Electrical Tower:

Description of Clearance Distance (Min)

Mobile Carin movement 4.0 Meter

Tower Carin movement 4.0 Meter

Carin movement 4.0 Meter

Moving Activity above height of Tower 4.0 Meter

Hedge Cutter movement 4.0 Meter

Min Safe Vertical Distance above Railway Track:

Description of Clearance Distance (Min)

Earthed conductors 5.5 Meter

Stay wires 5.5 Meter

Conductors up to 33 kV 6.5 Meter

Conductors above 33 kV to 220 kV 7.5 Meter

Conductors above 220 kV. 8 Meter

Min Distance between two Conductors on Same Supports:

High VoltageCircuit

High VoltageCircuit

Distance betweencircuits(min)

Up to 33 KV Up to 1KV 1.0 Meter

Up to 33 KV

More than

1KV 1.2 Meter

33 KV to 110 KV Up to 1KV 1.5 Meter

33 KV to 110 KVMore than

1KV2.0 Meter

More than 110 KV All 2.5 Meter

Min Distance between two Conductors on Different Supports:

High Voltage Circuit Distance (min)

Up to 1 KV 0.6 Meter



110 KV 2.4 Meter

More than 220 KV 2.8 Meter


21/23

Min Safety Distance from Electrical Apparatuses:

Description of Clearance Distance (min)

Passage In front of Metal Clad Switchgear(UP to HV)

1.0 Meter wide2.5 Height

Passage In rear or side of Metal CladSwitchgear (UP to HV)


Passage at any side of Metal Clad Switchgear containing Bare conductor (UP to HV)


Min Approach Distance for Non-Competent Person near exposed Live Parts:

Voltage Distance (min)

Below 110 kV 4.0 Meter

220 kV and above 6.0 Meter

Min Approach Distance for Competent Person near exposed Live Parts:


Below 1 kV 0.5 Meter

11 kV 1.5 Meter

22 kV 2.0 Meter

33 kV 2.5 Meter

66 kV 3.0 Meter

110 kV 4.0 Meter

220 kV and above 6.0 Meter


22/23


AUGUST 22, 20121 COMMENT

Standard: Western Power Company.

Water Safely Clearance on Electrical Fires:

Voltage

Minimum distances between a nozzle

producing a fog stream of freshwater and a live conductor

Up to 750 V 1.5 Meter

750 V to 15 KV 4.0 Meter


Minimum Approach Distance for Authorized Person:

This is the minimum distance that must be maintained by a person, vehicle or mobile plant.



1 V to 6.6 KV 0.7 Meter

6.6 KV to 11 KV 0.7 Meter







Minimum Approach Distance for Ordinary Person:



1 V to 6.6 KV 3.0 Meter

6.6 KV to 11 KV 3.0 Meter








23/23

Minimum Approach Distance for Vehicle & Plant for Ordinary Person:

VoltageDistance (min)

Mobile Plant Vehicle

Up to 1 KV 3.0 Meter 0.6 Meter

1 V to 6.6 KV 3.0 Meter 0.9Meter

6.6 KV to 11 KV 3.0 Meter 0.9Meter

11 KV to 22 KV 3.0 Meter 0.9Meter

22 KV to 33 KV 3.0 Meter 0.9Meter

33 KV to 66 KV 3.0 Meter 2.1 Meter




204189355 electrical safety clearance

Documents