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title, tags, up
| title | tags | up | |
|---|---|---|---|
| Fire Resistive Wiring Methods |
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electrical-construction |
Fire Resistive Wiring Methods
Requirements
Permitted methods for fire protection of emergency feeders are specified in nfpa-70_700_emergency-systems#700.10(D)(2) Feeder-Circuit Wiring..
!nfpa-70_700_emergency-systems#700.10(D)(2) Feeder-Circuit Wiring.
the requirements of which only apply to occupancies listed in nfpa-70_700_emergency-systems#700.10(D)(1) Occupancies.
!nfpa-70_700_emergency-systems#700.10(D)(1) Occupancies.
Note that even in these occupancies only nfpa-70_100_definitions#Feeder. require fire protection, not nfpa-70_100_definitions#Branch Circuit..
Construction
[!info] Keywords
- Low Smoke Zero Halogen (LSZH)
Fire Resistive Metal-Clad (MC) Cable
nfpa-70_330_mc-cable
Mineral Insulated (MI) Cable
nfpa-70_332_mi-cable
When terminating single conductors in a ferrous metal enclosure, it is necessary to terminate MI cables in a brass plate to prevent heating due to ferroelectric hysteresis Cut out and replace a section of the enclosure with the plate
When cutting a hole in the enclosure would void its listing, or is otherwise not allowed, the cables can be terminated through a brass plate into a junction box and power brought to the enclosure through a conventional raceway.
[!info] According to Pyrotenax literature, the intermediate junction box method is obligatory for fire pump controllers.
Fire Resistive Cable-in-Conduit (CIC)
Resources
VITALink Fire-Rated Cables | OmniCable