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This section provides an overview of general circuit design considerations and installation

guidelines for Pyrotenax

and Raychem

Fire-Rated Cables. For additional information,

contact your Tyco Thermal Controls representative or phone Tyco Thermal Controls at

(800) 545-6258. Also, visit our web site at www.tycothermal.com.

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Typical Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Pyrotenax System 1850 Fire-Rated Mineral Insulated Cable . . . . . . . . . . . . . . . . . . . . 3

Cable construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Raychem RHW and Raychem MC Fire-Rated Polymer Insulated Cable . . . . . . . . . . . . . 4

Raychem RHW Cable Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Raychem MC Cable construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Raychem CI Fire-Rated Polymer Insulated Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Cable construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Approvals and Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pyrotenax System 1850 MI cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Raychem RHW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Raychem MC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Raychem CI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Outside North America. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Fire Alarm Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Pyrotenax System 1850 and Raychem CI Fire Alarm Circuit Design Considerations. . . . 8

Cable sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Equipment bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Cable termination and splices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Installation Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Supporting fire alarm cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Seismic considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Terminating fire alarm cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Connecting fire alarm cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Critical Power Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Circuit Design Considerations Pyrotenax System 1850 . . . . . . . . . . . . . . . . . . . . . . . 11

Cable sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Voltage drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Equipment bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Short circuit capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Expansion and vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Corrosion and MI cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Cable termination and splices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Typical system installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Installation Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Fire-Rated Fire Alarm and

Power Cables


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FIRE-RATED FIRE ALARM AND POWER CABLES

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Tyco Thermal Controls

www.tycothermal.com (800) 545-6258

H57573 12/05

Supporting System 1850 MI cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16


Cable layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Terminating System 1850 MI cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Connecting System 1850 MI cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Circuit Design Considerations Raychem RHW and MC cables . . . . . . . . . . . . . . . . . . 19

Cable sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Voltage drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Equipment bonding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Cable termination and pull boxes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Installation Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Supporting Raychem fire-rated cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Supporting Raychem RHW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Terminating Raychem RHW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Connecting Raychem RHW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Supporting Raychem MC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Terminating Raychem MC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Connecting Raychem MC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22


Cable layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22


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Introduction

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Introduction

Tyco Thermal Controls Pyrotenax

System 1850 mineral insulated (MI) wiring cables and

Raychem

polymer insulated cables (RHW, MC, and CI) meet the relevant requirements of

the U.S. National Electrical Code (NEC), the National Fire Alarm Code, the Canadian Electrical

Code (CEC), and the Canadian National Building Code for fire protection of emergency power

feeders and fire alarm circuits. The codes stipulate that a reliable source of power is requiredto operate all critical life safety circuits necessary to provide time for a safe evacuation of

building occupants and to allow emergency crews to effectively control the fire. Fire resis-

tance ratings of 1-hour or 2-hours are required depending on national and local codes, the

type of circuit, and the environment.

Typical Applications

Tyco Thermal Controls fire-rated wiring cables meet the most stringent requirements for

2-hour fire rating, allowing for the highest degree of fire protection for emergency back-up

power supply systems, emergency equipment, and fire alarm systems. In the event of a fire,

electrical power and communication is preserved for critical life safety circuits. These critical

circuits provide power for: Fire pumps to maintain pressure in the sprinkler system

Firefighters elevators

Smoke dampers and pressurization fans to maintain smoke-free areas for egress

Smoke extraction fans

Emergency lighting and exit signs

Fire alarm and voice communication systems

Typical Locations

Typical locations requiring emergency power feeders include:

High-rise buildings

Hospitals and other institutions

Historic buildings

Tunnels and subways

Airports, stadiums, hotels, banks, etc.

Pyrotenax System 1850 Fire-Rated Mineral Insulated Cable

System 1850 2-hour fire-rated MI cable offers a unique combination of dependability,

versatility, and permanence while withstanding continuous operating temperatures as high

as 250C (82F) and intermittent exposure temperatures as high as 1010C (1850F).

Featuring zero smoke, zero flame spread, zero fuel contribution and up to 80% space

savings compared to conventional conduit and wire systems, System 1850 MI cable is the

preferred choice for many specifiers. The ease with which this tough cable can be pulled into

difficult runs with tight corners makes it an ideal choice for many applications. System 1850

MI cable may be installed in virtually any location: outdoors, submersed or buried with a

protective over-jacket. The cable can be bent, twisted, or pulled, and can withstand

mechanical abrasion while remaining fully functional.

System 1850 MI cable is 2-hour fire-rated to UL 2196 / ULC S139-00, which utilize the ASTM

E-119 time-temperature curve. The test requires that cables remain operational after


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exposure to temperatures up to 1010C (1850F) for two hours followed by the full force of a

firefighters hose stream. System 1850 MI cable passes this rigorous circuit integrity test

without additional mechanical protection.

CABLE CONSTRUCTION

Pyrotenax System 1850 MI cables are manufactured using only inorganic materials, copper

and magnesium oxide. This construction is inherently tough, yet allows the cable to be bent

and molded to fit into tight spaces. In addition, the totally inorganic construction of

unjacketed System 1850 MI cable allows for an environmentally clean electrical cable that

does not burn, produce smoke, or contribute fuel when exposed to fire conditions.

Fig. 1 System 1850 MI cable construction

For superior corrosion protection, an optional polymer jacket is available and is suitable for

use in temperatures as low as 40C (40F).

CONFIGURATIONS

System 1850 fire-rated MI cables are available in a range of sizes and conductor

configurations for power feeders and in twisted pair configurations for fire alarm circuits.

600 V cables are approved for power feeders; 300 V cables are approved for signal

applications.

Raychem RHW and Raychem MC Fire-Rated Polymer Insulated Cable

Raychem RHW and Raychem MC are 2-hour fire-rated cables capable of withstanding expo-

sure temperatures up to 1010C (1850F). Raychem RHW achieves its fire rating when

installed in conduit. Raychem MC is a stand-alone fire-rated system that can be installed in

cable tray, in conduit, or directly supported. Featuring the familiarity and ease of installation

and termination of conventional conduit and wire systems, Raychem RHW cable is preferred

by many installers. Single and multiconductor Raychem MC offers the benefit of single-pull

installation and ease of pulling into locations with restricted space and runs with tight corners.

All Raychem fire-rated cables are 2-hour fire-rated to UL 2196 and ULC S139, which utilize

the ASTM E-119 time-temperature curve. The test requires that cables remain operational

after exposure to temperatures up to 1010C (1850F) for two hours, followed by the full

force of a firefighters hose stream. Raychem MC cable passes this rigorous circuit integrity

test without additional mechanical protection.

RAYCHEM RHW CABLE CONSTRUCTION

Raychem RHW cables are NEC Type RHH/RHW constructed to UL 44, and CEC Type R90,

constructed to CSA C22.2 No.38. Through unique design parameters and the use of highest

quality materials, this cable may be installed in wet locations and provides a 2-hour fire rat-

ing when installed in conduit. The conductor material is designed to withstand the tensile

stresses in a vertical run and is covered with a helically applied tape fire barrier. The silicone

insulation is a special type that provides electrical protection under fire conditions. The outer

Solid copperconductors

Magnesiumoxide (MgO)

insulation

Seamlesscopper sheath


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Introduction

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jacket is a cross-linked polyolefin (XLPO) that gives superior abrasion protection and has a

low coefficient of friction for easy pulling into conduits. Both insulation and jacket are made

from low smoke zero halogen material and meet the low toxicity index per NES 713 (Naval

Engineering Standard 713).

Fig. 2 Raychem RHW cable construction

CONFIGURATIONS

Raychem RHW fire-rated cables are available in a range of sizes in single conductorconfiguration only. This cable is 600 V rated and may be used in any application allowed by

electrical codes for Type RHH or RHW (Type R90 in Canada). For specifications, see the

product data sheets in the Technical Data section.

RAYCHEM MC CABLE CONSTRUCTION

Raychem MC cables are constructed to UL 1569 and are unique in this cable type in

providing a 2-hour fire rating. This metal-clad cable provides fire resistance without conduit

protection and the copper armor of Raychem MC cable meets the code requirements of the

NEC for an equipment grounding conductor.

For superior corrosion protection, an optional flame retardant polyvinyl chloride (PVC) or

low smoke, zero halogen polyolefin jacket is available.

Fig. 3 Raychem MC cable construction

CONFIGURATIONS

Raychem MC fire-rated cables are available in a range of single and multiconductor sizes and

conductor configurations. For specifications, see the product data sheets in the Technical

Data section.

Silicone rubber insulation

Low smoke, zero halogen

(XLPO) jacket

Fire barrier tape

Annealed copper conductor


Silicone rubber inner jacket

Continuously welded andcorrugated copper armor

Annealed copper conductor


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Raychem CI Fire-Rated Polymer Insulated Cable

Raychem CI polymeric cable is a line of fire alarm cable that is ideal for twisted pair commu-

nication wiring and also meets the survivability requirements of NFPA 72. It is a UL Listed

2-hour fire-rated cable requiring no conduit protection. It is also listed as a 2-hour fire-rated

Electrical Circuit Protective System when installed within the specified protective conduit.

CABLE CONSTRUCTION

Raychem CI meets the requirements for FPL cables to UL 1424, NPLF cables to UL 1425,

and FAS cables to CSA C22.2 No.208. The conductors for both shielded and unshielded

cables are insulated with silicone rubber and twisted together to form a single pair. In the

shielded design, the pair is wrapped with a copper/polyester tape shield and bare copper

drain wire. In both designs, the assembly is covered with a low smoke, zero halogen polyole-

fin jacket. The construction of Raychem CI allows the installer to strip the cable with minimal

effort.

Fig. 4 Raychem CI cable construction

CONFIGURATIONS

Raychem CI fire-resistant cable is a stand-alone 2-hour fire-rated cable, requiring no conduit

protection to achieve the fire-rating when tested to UL 2196. However, it is also 2-hour

fire-rated when installed in 1/2" minimum electrical metallic tubing (EMT) or rigid metal

conduit (RMC) and is ideal for retrofit applications in existing conduit. Raychem CI is fire-

rated with a utilization voltage of 72 V and is available in shielded and unshielded twisted pair

configurations, 18 AWG through 12 AWG. For specifications, see the product data sheet in

the Technical Data section.

Approvals and Certifications

PYROTENAX SYSTEM 1850 MI CABLE

Pyrotenax System 1850 MI cables meet the requirements of the circuit integrity fire test,

UL 2196 (ULC S139 in Canada), and are UL Listed and CSA Certified in North America.

The details of this system appear in the UL and ULC Fire Resistance Directories, in the UL

Directory as Electrical Circuit Protective System (FHIT), System No. 10, and are Factory

Mutual (FM) 2-hour fire rated.

Factory preterminated MI cable sets are approved for both nonhazardous locations and

hazardous locations. For specific approval information, see the product data sheets in the

Technical Data section.

Copper/polyester tape shield

Stranded copper drain wire

Low smoke, zerohalogen polyolefin jacket


Annealed solid copper conductor

Low smoke, zerohalogen polyolefin jacket


Annealed solid copper conductor

Shielded cableUnshielded cable


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Introduction

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RAYCHEM RHW

When installed in conduit as specified, Raychem RHW cables meet the requirements of the

circuit integrity fire test, UL 2196 (ULC S139 in Canada), and are UL Listed and CSA Certified

in North America. They are listed in the UL and ULC Fire Resistance Directories. For specific

approval information, see the product data sheets in the Technical Data section.

RAYCHEM MC

Raychem MC cables meet the requirements of the circuit integrity fire test, UL 2196, and are

UL Listed. They are listed in the UL Fire Resistance Directory. Note: 'MC' is not a CEC cable

type. For specific approval information, see the product data sheets in the Technical Data

section.

RAYCHEM CI

Raychem CI cables are UL Listed as stand-alone fire-rated cables requiring no conduit

protection when tested to UL Standard No. 2196. However, they are also listed in the UL and

ULC Fire Resistance Directories as fire-rated systems when provided with conduit protection.

They are CSA Certified and UL Listed fire alarm cables, NEC Type FPL and NPLF, and CSA

Type FAS. Cables are also UL listed as Type CL3 (Class 3 cables for remote control, signaling

and power limited circuits). For specific approval information, see the product data sheets in

the Technical Data section..

OUTSIDE NORTH AMERICA

Pyrotenax fire-rated fire alarm and power cables are also available for use outside North

America, and are LPCB certified to BS 6387, Categories C, W, and Z, and to BS 5839-1:2002

for standard and enhanced grades of cable. These products carry the CE Mark, and are

approved to local standards. Contact Tyco Thermal Controls for information on our range of

cables certified for use worldwide.


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Fire Alarm Circuits

Fire alarm circuits may utilize Pyrotenax System 1850 MI cables or Raychem CI polymeric

cables. The following general guidelines relate to the design and installation of fire alarm

circuits using either cable technology.

Pyrotenax System 1850 and Raychem CI Fire Alarm Circuit Design Considerations

Fire alarm systems should only be designed by professionals familiar with generally

accepted design practices. The information provided below relates specifically to designs

using Tyco Thermal Controls fire alarm cables and must be followed, along with all relevant

local codes and standards, to ensure that the systems are designed properly. For additional

information, contact your Tyco Thermal Controls representative or phone Tyco Thermal

Controls at (800) 545-6258.

CABLE SIZING

Primarily data and signal communications, these circuits are low voltage and low current,

utilizing 18 AWG through 12 AWG conductors.

Cable sizing should be in accordance with the fire alarm system manufacturers

recommendations.

EQUIPMENT BONDING

The copper sheath of System 1850 cable meets North American code requirements for an

equipment grounding conductor.

CABLE TERMINATION AND SPLICES

When using Raychem CI or Pyrotenax System 1850 shielded cables, the drain wire is

connected to the metallic foil or shield. At each junction box, the drain wires are connected

together, but not grounded; the shield drain wire is only grounded at one point in the circuit.

Raychem CI polymeric cable

Special terminations are not required for Raychem CI cable. A 2-hour fire-rated slice box

is available for use with this cable.

System 1850 MI cable

System 1850 MI fire alarm cables are approved as a complete system only when used

with the appropriate Pyrotenax termination and splice kits. The use of nonapproved

components may compromise the reliability of the system and will invalidate approvals

and warranties.

Fig. 5 System 1850 MI cable termination

Brassgland

Pot


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Fire Alarm Circuits

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Fig. 6 Typical fire alarm system

Installation Guidelines

These installation guidelines apply to Pyrotenax System 1850 MI and Raychem CI polymericcables only. When installing a system, refer to the requirements in the UL/ULC Fire Resis-

tance Directory and the appropriate System 1850 or Raychem CI data sheets and installation

instructions (available via the Tyco Thermal Controls web site at www.tycothermal.com).

SUPPORTING FIRE ALARM CABLE

It is important that all support components are made of appropriate materials, such as copper,

steel, stainless steel, and concrete. Materials such as aluminum, brass, plastic, lead, wood,

etc. are not acceptable.


In fire alarm applications, Raychem CI may be installed without conduit protection, pro-

vided that it is mounted on noncombustible surfaces such as concrete or masonry, or

supported by steel hangers from these surfaces. It may also be installed in 1/2" minimum

EMT, with steel set-screw fittings, or 1/2" RMC. Conduit supports must be spaced 48" on

center.

System 1850 MI cable

System 1850 MI cables may be directly mounted on noncombustible surfaces such as

concrete or masonry, or supported by steel rod and channel (trapeze) systems.

Tyco Thermal Controls and UL/ULC listing requirements for fire-rated cables stipulate

support spacing at certain intervals; refer to the installation instructions shipped with the

product and available via the Tyco Thermal Controls web site, www.tycothermal.com.

Emergencysplitter

Transferswitch

CPU

Security console(Central alarm control facility)

Basement

BasementGround

1st floor

2ndfloor

3rdfloor

4thfloor

5thfloor

6thfloor

7thfloor

8thfloor

9thfloor

nthfloor

Data-gathering panels

First device on each floor(Pull station, horn, speaker, strobe)

Other devices

Roof

Fire-ratedcable


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Fig. 7 Typical fire alarm installations for System 1850 MI cable

SEISMIC CONSIDERATIONS

In areas where the risk of seismic activity is high, precautions must be taken where Tyco

Thermal Controls fire-rated cables cross expansion joints and at termination points.

For more information, see Appendix D.

TERMINATING FIRE ALARM CABLE


Raychem CI cables are terminated in the same manner as conventional cable and do not

require special terminations. When terminating shielded cable, the shield is exposed by

stripping back the outer jacket, then removed and discarded. The shield drain wire is in

direct contact with the shield throughout the cable, and is used to preserve shield conti-

nuity at termination and splice points. The drain wire is joined at intermediate splice

points, but not bonded to ground; single point grounding dictates that it be bonded toground only at one end of a complete circuit.

Pyrotenax System 1850 MI cable

Details on terminating Pyrotenax System 1850 MI cables can be found in the installation

instructions provided with each System 1850 MI fire alarm cable termination kit. Factory

preterminated System 1850 MI cable sets are available. For details on preterminated

cable sets, contact your Tyco Thermal Controls representative or phone Tyco

Thermal Controls at (800) 545-6258.

CONNECTING FIRE ALARM CABLE


For Raychem CI cable installed in EMT, use only steel set-screw connectors or an all-steel

compression bushing for coupling the EMT, and for the EMT connection to the enclosure.Zinc or other materials are not acceptable.

Pyrotenax System 1850 MI cable

For Pyrotenax System 1850 MI cables, the termination gland is a brass fitting available in

1/2" and 3/4" NPT sizes, depending on the cable diameter.

Fig. 8 Brass gland

Trapeze Method Direct Mounting Method

Steelrod

Steelchannel

Twisted paircables

Noncombustiblematerial

Twisted paircables


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Critical Power Circuits

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Gland size information for each specific cable is available from the product data sheets in the

Technical Data section. When tightened with the recommended torque, this gland simulta-

neously seals the enclosure and grips the cable through a brass compression sleeve. This

connection, when installed according to the installation instructions, provides the following

benefits:

Hydrostatic withstand pressure up to 6000 lbs/sq in (4.22 kg/sq mm)

Pull-off force, when tightened to torque settings, as shown in Table 1


Critical power circuits utilize Pyrotenax and Raychem cables. The following general

guidelines relate to the design and installation of critical power circuits specific to both

technologies.

Circuit Design ConsiderationsPyrotenax System 1850

Critical power circuit systems should only be designed by professionals familiar with gener-

ally accepted design practices. The information provided below relates specifically to designs

using Pyrotenax power cables and must be followed, along with all relevant local codes and

standards, to ensure that the systems are designed properly. For further information, contact

your Tyco Thermal Controls representative or phone Tyco Thermal Controls at (800) 545-6258.

CABLE SIZING

System 1850 MI cable size is based on circuit breaker size, which in turn is based on load

calculations. Special rules apply for motors, including fire pumps, where cable size is based

on 125% of full load current. Use the ampacity tables specified in the electrical code to

determine the cable size. If the calculated voltage drop exceeds the specified limits, a larger

cable size must be chosen.

Multiconductor MI cables have the same ampacity ratings as multiconductor polymeric cable

types. However, the NEC allows full free air ampacity for unjacketed single conductor MI

cables configured according to Fig. 9 as long as a space of 2.15 cable diameters is

maintained between bundles.

In Canada, cable size is determined in accordance with Sections 4 and 8 of the CEC.

Table 1 Pull-Off Force for Torque Settings

Gland size (NPT) (in) Recommended torque (lbs-ft) Pull-off force (lbs)

1/2 25 175

3/4 42 200


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Fig. 9 Spacing of bundled conductors

Although unjacketed single conductor MI cable is unaffected by any temperature increase

resulting under the installation conditions shown in Fig. 9, the termination may need to be

sized-up to keep it within its temperature limits in accordance with electrical code require-

ments. Refer to the installation instructions shipped with the product for details on sizing

terminations.

VOLTAGE DROP

Voltage drop calculations are based on calculated load, not circuit breaker rating.

For conventional cables, simple formulas are used to determine if the cable size listed in the

ampacity tables meets the required voltage drop limits. While these formulas can be applied

to System 1850 MI cable, voltage drop values specific to the characteristics of MI cable can

be calculated using any of the following:

An equation based on the run length, the conductor current, and the circuit voltage is

provided in Appendix B

A quick voltage drop calculator is available via the Tyco Thermal Controls web site,

www.tycothermal.com Pyrosizer MI cable sizing software is available via the Tyco Thermal Controls web site,

www.tycothermal.com, or through your Tyco Thermal Controls representative

EQUIPMENT BONDING

The copper sheath of System 1850 MI cables meets North American code requirements for

the equipment grounding conductor. The brass gland completes the grounding path from the

cable sheath to the equipment. For single conductor cables, the ground path includes a non-

ferrous brass plate, as shown in Fig. 10 (in Canada, brass plates are required only for ampac-

ities over 200 A).

Spacing (S) betweenmultiphase paralleledsingle conductor cables(see Fig. 1.16)

(S)

(S)

MulticonductorMI cable

SingleconductorMI cables


13/22


H57573 12/05



13 of 22

.

Fig. 10 Equipment bonding using brass plate

SHORT CIRCUIT CAPABILITY

The following graphs give the maximum allowable short circuit currents for System 1850 MI

cables. The first is based on the cable only. The cable will survive if the short circuit currents

shown are not exceeded; however, the terminations could be damaged. The second graph

provides the maximum short circuit current to avoid damage to terminations. The cable

system will tolerate short circuit currents up to this magnitude and survive undamaged.

Fig. 11 Short circuit currents

MulticonductorMI cable

Brass glandBrass plate

Enclosure wall

Lock washer

Details of brass plate

Steel enclosure cutout(steel must be removed)

Lock washer

Single conductorMI cables

Lock washers

10

100

1000

Conductor Size

18

14

16

12

10

8 6 4 3 2 1 1 /0

2/0

3/0

4/0

250kcmil

350kcmil

500kcmil

ConductorCurrent

ThousandsofAmps

0.1

1

0.1

1

10

100

1000

Conductor Size

1 cycle

2 cycles

4 cycles

8 cycles

16 cycles30 cycles

60 cycles90 cycles

18

14

16

12

10

8 6 4 3 2 1 1 /0

2/0

3/0

4/0

250kcmil

350kcmil

500kcmil

ConductorCurrent

ThousandsofAmps

1 cycle

2 cycles

4 cycles

8 cycles

16 cycles

30 cycles60 cycles90 cycles

Maximum short circuit currentsfor Pyrotenax MI cablesexcluding terminations

Maximum short circuit currentsfor Pyrotenax MI cables

to avoid damage to terminations


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EXPANSION AND VIBRATION

In certain circumstances it may be necessary to take precautions to prevent mechanical

damage to System 1850 MI cable. See Appendix D for details.

CORROSION AND MI CABLE

In most applications, System 1850 MI cables can be used without any additional protection

against corrosion. However, in applications where the cable may be exposed to corrosives,

such as when the cable is directly buried or embedded in concrete, additional protection in

the form of a polymer jacket is required. Refer to Appendix E for more information on corro-

sion and MI cable.

CABLE TERMINATION AND SPLICES

System 1850 MI cables are approved as a complete system only when used with the appro-

priate Pyrotenax termination and splice kits. The use of nonapproved components will com-

promise the reliability of the system and will invalidate approvals and warranties.

Two types of termination kits are available: Pyropak kits for all single and multiconductor

cables, and Quickterm kits for #6 AWG and larger single conductor cables. The Quickterm

kits include a special connector to splice the solid MI conductor to a flexible tail (flexible tail

not supplied).

Factory preterminated System 1850 MI cable sets are available in a range of sizes and lengths.

For details on preterminated cable sets, contact your Tyco Thermal Controls representative

or phone Tyco Thermal Controls at (800) 545-6258.

Fig. 12 Terminations for System 1850 MI cable

In cases where the manufactured length is shorter than the required run length, a splice is

used to join individual lengths of cable. Two options for splicing System 1850 MI cable are

available:

Factory fire-rated splice:

A UL/ULC 2-hour fire-rated, all-welded joint is installed at thefactory.

Field-installed fire-rated splice:

A field-installed fire-rated splice, consisting of a splice kit

and a separate field fire protection kit, is used to extend cable length.

Cap andsleeveassemblies

Self-sealingtape

Brassglands

Heat-shrinkablesleeving

Brassglands

Sealingcompound

Crimpconnectors

Brasspots

Pyropak Quickterm


15/22


H57573 12/05



15 of 22

Fig. 13 Splices for System 1850 MI cable

TYPICAL SYSTEM INSTALLATION

A typical critical power circuit installation utilizing System 1850 MI cable is shown in Fig. 14.

Additionally, components and accessories available for single and multiconductor MI cablesare shown in Table 2. For further information on components and accessories, see the prod-

uct data sheet in the Technical Data section.

Fig. 14 Typical System 1850 power circuit system

Factory splice

Field-installed splice

Emergencysplitter

Emergencysplitter

Splice

Generator

GFire

pump

Transferswitch

Mainelectrical

switchgear

Transferswitch

Flexibletails

Quickterm

Brassplate

Gearclamp

Clamp

System 1850 fire-rated MI cable

Table 2 Component and Accessory Availability

Catalog number Single conductor MI Multiconductor MI

Pyropak

Quickterm

Field and factory splices

Brass plates


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H57573 12/05


These installation guidelines apply to System 1850 MI cables only. When installing a system,

refer to the requirements in the UL/ ULC Fire Resistance Directory and appropriate System

1850 data manuals and installation instructions shipped with the product, and available via

the Tyco Thermal Controls web site at www.tycothermal.com. Refer to national and local

electrical codes for additional details. For further information, contact your Tyco ThermalControls representative or phone Tyco Thermal Controls at (800) 545-6258.

SUPPORTING SYSTEM 1850 MI CABLE

It is important that all support components are made of appropriate materials, such as copper,

steel, stainless steel, and concrete. Materials such as aluminum, brass, plastic, lead, wood,

etc. are not acceptable.

System 1850 MI cable may be directly mounted on noncombustible surfaces such as

concrete or masonry, or supported by steel rod and channel (trapeze) systems. To achieve

free air rating, spacing must be maintained between the cable bundles and also between the

bundles and the mounting surface; refer to Fig. 15. Tyco Thermal Controls and UL/ULC

listing requirements for fire-rated cables stipulate support spacing at certain intervals; refer

to the installation instructions shipped with the product and available via the Tyco ThermalControls web site, www.tycothermal.com.

System 1850 MI cable should not be installed in conduit, other than when transitioning

through a wall, floor, or ceiling,

Fig. 15 Supporting System 1850 MI cable

It is important to keep the overall loading on the rod and channel system within limits.

Table 3 shows the recommended loading guidelines based on the minimum channel depth

of 1-1/2 inch. Note that the cable load calculations as shown in Table 3 take into account

only the load represented by the MI cable.

Steelrod

1-1/2" channel(to maintain NEC

free air rating)Multiconductor

cable

Free air rated installation Free air rated installation Non-free air rated installation

Singleconductor

cables Steelchannel



Singleconductorcables

Table 3 Loading Guidelines

Cable load* Support method

Up to 150 lbs 3/8" threaded rod

Between 150 lbs and 200 lbs 1/2" threaded rod

Between 200 lbs and 300 lbs 1/2" threaded rod, double channel

* Cable load = lbs/ft cable x total number of runs x 4

Note:

Maximum width of 1-1/2" channel: 36"


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17 of 22


In areas where the risk of seismic activity is high, precautions must be taken where the cable

crosses expansion joints and at termination points. For more information, see Appendix D.

CABLE LAYOUT

In multiconductor cables, the magnetic effects of the phase conductors cancel each other

out, allowing for cable installation in any configuration. However, single conductor cables

should be bundled in groups containing one conductor from each phase to minimize the

resulting magnetic field in each grouping. The grouped single conductor cables are then

fastened tightly together, ensuring that the gland connectors at each end of the cable run are

connected to the metal enclosure, either directly or through a brass plate. Typical single

conductor cable configurations are shown in Fig. 16. The neutral conductor may be located

within or outside the cable group.

Fig. 16 Recommended installation configurations

Electrical codes generally limit paralleling cable configurations to cable sizes 1/0 AWG and

larger. The codes address the balancing of resistance by stipulating:

All conductors must be the same length

All conductors must be the same size and the same material

All conductors must have the same type of insulation

All conductors must be terminated in the same manner

A current measurement should be taken immediately after the cables begin to carry load.

Load imbalances between conductors of up to 10% are tolerable and expected. Deviations

above 10% must be investigated and corrected.

When installing single conductor cables through a ferrous enclosure, precautions must be

taken to prevent induction heating in the steel. This is accomplished by removing a section of

the enclosure and installing a nonferrous brass plate (in Canada, this is only required above

200 amperes). Brass plates with pretapped holes are available for the gland connectors.

Single circuit(preferred)

Single circuit(alternative)

Two cables inparallel per phase

(preferred)


(alternative)

Three or more cablesin parallel per phase

(preferred)


(alternative)

Note: The spacing S between bundles, not including neutral, should be a minimum of 2.15 cable diameters in the U.S. (NEC), or 2 cable diameters in Canada (CEC).Neutral may be located as shown, or outside groups in the most convenient location.

NAB

NBA

NAB

NAB

NAB

NAB

ABN

ABN ABC ABCNBA ABCNNCBA

ABC ABCN

ABC BC

AN

S

S

ABN ABNS

ABNS

ABC ABCS

ABCS

ABCNS

ABCNS

ABCN

ABC

ABC

S

ABC

ABC

S ABC

S

BCBCANAN S

BCBCANAN S

BCANSS S

Single Phase 3 Phase 3 Wire 3 Phase 4 Wire


18/22


18 of 22 Tyco Thermal Controls www.tycothermal.com (800) 545-6258 H57573 12/05

Fig. 17 Enclosure with cutout and brass plate

TERMINATING SYSTEM 1850 MI CABLE

Details on terminating System 1850 MI cables can be found in the installation instructionsprovided with each System 1850 MI cable termination kit.

Factory preterminated System 1850 MI cable sets are available in a range of sizes and lengths.

For details on preterminated cable sets, contact your Tyco Thermal Controls representative

or phone Tyco Thermal Controls at (800) 545-6258.

Fig. 18 Preterminated cable set

CONNECTING SYSTEM 1850 MI CABLE

The termination gland is a brass fitting available in standard NPT sizes. The glands are sup-

plied in 1/2", 3/4", 1", or 1-1/4" sizes, depending on the cable diameter.

Fig. 19 Brass gland

Gland size information for each MI cable is available from the product data sheets in the

Technical Data section. When tightened with the recommended torque, this gland simulta-

neously seals the enclosure and grips the cable through a brass compression sleeve. This

connection, when installed according to the installation instructions, provides the following

benefits:

Brassplate


19/22



Hydrostatic withstand pressure up to 6000 lbs/sq in (4.22 kg/sq mm)

Pull-off force when tightened to torque settings as shown in Table 4

Note: Terminations are not required to be fire-rated since the emergency equipment they

serve is in a fire-rated room.

Circuit Design ConsiderationsRaychem RHW and MC cables

Critical power circuit systems should only be designed by professionals familiar with

generally accepted design practices. The information provided below relates specifically to

designs using Raychem RHW and MC power cables and must be followed, along with allrelevant local codes and standards, to ensure that the systems are designed properly. For

further information, contact your Tyco Thermal Controls representative or phone Tyco


CABLE SIZING

Cable size is based on circuit breaker size, which in turn is based on load calculations.

Special rules apply for motors, including fire pumps, where cable size is based on 125% of

full load current. Use the ampacity tables specified in the electrical code to determine the

cable size. If the calculated voltage drop exceeds the specified limits, a larger cable size must

be chosen.

Ampacity for Raychem RHW cables is based on cable in conduit rules in the NEC and CEC.

Higher ampacity is allowed for single conductor Raychem MC, in accordance with NEC Table310.20, when bundled and configured for free air as shown in Fig.1.15 as long as a space of

2.15 cable diameters is maintained between bundles.

VOLTAGE DROP

Standard voltage drop calculations apply to Raychem RHW and MC cables.

EQUIPMENT BONDING

Normal equipment bonding rules apply to Raychem RHW in conduit; a properly sized equip-

ment grounding conductor is required. For further information on Raychem fire-rated

grounding conductors, contact your Tyco Thermal Controls representative or phone Tyco


Raychem MC cables are designed so that the copper sheath meets the NEC requirement for

an equipment grounding conductor; no separate grounding conductor is required. For single

conductor cables, the ground path includes a nonferrous (brass) plate.

CABLE TERMINATION AND PULL BOXES

Raychem RHW cables are terminated in the same manner as conventional cable in conduit

and do not require special terminations. Pullboxes are approved for use with Raychem RHW.

Raychem MC is terminated using readily available brass fittings and simple tools. Details of

terminating procedures can be found in the installation instructions provided with each cable

shipment.

Table 4 Pull-Off Force for Torque Settings

Gland size (NPT) (in) Recommended torque (lbs-ft) Pull-off force (lbs)

1/2 25 175

3/4 42 200

1 58 250

1-1/4 75 300


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20 of 22 Tyco Thermal Controls www.tycothermal.com (800) 545-6258 H57573 12/05


These installation guidelines apply to Raychem fire-rated cables only. When installing a

system, refer to the requirements in the UL/ ULC Fire Resistance Directory and appropriate

Raychem RHW or Raychem MC installation instructions shipped with the product and

available via the Tyco Thermal Controls web site at www.tycothermal.com. Refer to national

and local electrical codes for additional details. For further information, contact your TycoThermal Controls representative or phone Tyco Thermal Controls at (800) 545-6258.

SUPPORTING RAYCHEM FIRE-RATED CABLES

It is important that all support components are made of appropriate materials, such as

copper, steel, stainless steel, and concrete. Materials such as aluminum, brass, plastic, lead,

wood, etc. are not acceptable.

SUPPORTING RAYCHEM RHW

Raychem RHW fire-rated cable in conduit may be mounted in any environment suitable for

conventional RHW cable in conduit. The conduit may be directly mounted on noncombusti-

ble surfaces such as concrete or masonry, or supported by steel rod and channel (trapeze)

systems. In a vertical run, the conductors must be supported inside the conduit in the rec-

ommended manner described in the installation instructions shipped with the product andavailable via the Tyco Thermal Controls web site at www.tycothermal.com.

Fig. 20 Supporting Raychem RHW cable


Following are the recommended loading guidelines based on a minimum channel depth of

1-1/2 inch.

Trapeze support Two piece clamp

Wall or floorassembly

(noncombustiblematerial)

ConduitSteelchannel

Clamp

Conduit

Steel channel

Clamp



Up to 150 lbs 3/8" threaded rodBetween 150 lbs and 200 lbs 1/2" threaded rod

Between 200 lbs and 300 lbs 1/2" threaded rod, double channel

* Cable load = (lbs/ft of conduit x total number of conduits + lbs/ft cable x total number of runs) x 5

Note: Maximum width of 1-1/2" channel: 36"


21/22



TERMINATING RAYCHEM RHW

In critical circuits, Tyco Thermal Controls requires installation of an intermediate box to

prevent ingress of gases into critical equipment enclosures, as described in the installation

instructions shipped with the product, and available via the Tyco Thermal Controls web site

at www.tycothermal.com.

CONNECTING RAYCHEM RHW

No special accessories or tools are required for connecting Raychem RHW.

SUPPORTING RAYCHEM MC

Raychem MC may be directly mounted on noncombustible surfaces such as concrete or

masonry, or supported by steel rod and channel (trapeze) systems (see Figure 1.21). Free air

rating may be achieved when using bundled single conductor cables providing the proper

spacing is maintained between bundles and also between bundles and the mounting surface;

refer to Fig. 1.15. Tyco Thermal Controls and UL/ULC listing requirements for fire-rated

cables stipulate support spacing at certain intervals; refer to the installation instructions

shipped with the product and available via the Tyco Thermal Controls web site,

www.tycothermal.com.

Fig. 21 Supporting Raychem MC cable


Following are the recommended loading guidelines based on a minimum channel depth of

1-1/2 inch. Note that the cable load calculat ions as shown in Table 6 take into account only

the load represented by the MI cable.

TERMINATING RAYCHEM MC

In critical circuits, Tyco Thermal Controls requires installation of an intermediate box to

prevent ingress of gases into critical equipment enclosures, as described in the installation

instructions shipped with the product, and available via the Tyco Thermal Controls web site

at www.tycothermal.com.

Trapeze support Kindorf clamp Two piece clamp


(noncombustible

material)

Steelchannel

Steelchannel


(noncombustible

material)

ClampClamp

Armor

Steel channel

Clamp

ArmorArmor



Up to 150 lbs 3/8" threaded rod

Between 150 lbs and 200 lbs 1/2" threaded rod

Between 200 lbs and 300 lbs 1/2" threaded rod, double channel* Cable load = lbs/ft cable x total number of runs x 4

Note: Maximum width of 1-1/2" channel: 36"


22/22


CONNECTING RAYCHEM MC

Removal of the copper sheath and insulation from the conductors is accomplished with stan-

dard tools in a few simple steps. For details, refer to the installation instructions shipped with

the product, and available via the Tyco Thermal Controls web site at www.tycothermal.com.


In areas where the risk of seismic activity is high, precautions must be taken where the cable

crosses expansion joints and at termination points. For more information, see Appendix D.

CABLE LAYOUT

In multiconductor cables, the magnetic effects of the phase conductors cancel each other

out, allowing for cable installation in any configuration. However, single conductor cables

should be bundled in groups containing one conductor from each phase to minimize the

resulting magnetic field in each grouping. The grouped single conductor cables are then

fastened tightly together, ensuring that the gland connectors at each end of the cable run are

connected to the metal enclosure, either directly or through a brass plate. Typical single

conductor cable configurations are shown in Fig. 22. The neutral conductor may be located

within or outside the cable group.

Fig. 22 Recommended installation configurations

Electrical codes generally limit paralleling cable configurations to cable sizes 1/0 AWG and

larger. The codes address the balancing of resistance by stipulating:

All conductors must be the same length

All conductors must be the same size and the same material

All conductors must have the same type of insulation

All conductors must be terminated in the same manner

A current measurement should be taken immediately after the cables begin to carry load.

Load imbalances between conductors of up to 10% are tolerable and expected. Deviations

above 10% must be investigated and corrected.

When installing single conductor cables through a ferrous enclosure, precautions must be

taken to prevent induction heating in the steel. This is accomplished by removing a section of

the enclosure and installing a brass plate, or by cutting slots in the enclosure between the

cable entries.

Single circuit(preferred)

Single circuit(alternative)


(preferred)


(alternative)


(preferred)

Three or more cables

in parallel per phase(alternative)

Note: The spacing S between bundles, not including neutral, should be a minimum of 2.15 cable diameters in the U.S. (NEC), or 2 cable diameters in Canada (CEC).Neutral may be located as shown, or outside groups in the most convenient location.

NAB

NBA

NAB

NAB

NAB

NAB

ABN

ABN ABC ABCNBA ABCNNCBA

ABC ABCN

ABC BC

AN

S

S

ABN ABN

S

ABN

S

ABC ABC

S

ABC

S

ABCN

S

ABCN

S

ABCN

ABC

ABC

S

ABC

ABC

S ABC

S

BCBCANAN S

BCBCANAN S

BCANSS S

Single Phase 3 Phase 3 Wire 3 Phase 4 Wire

01fire rated

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