61 lines
2.0 KiB
Markdown
61 lines
2.0 KiB
Markdown
---
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title: Fire Resistive Wiring Methods
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tags:
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- type/encyclopedia
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up: "[[electrical-construction]]"
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---
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# Fire Resistive Wiring Methods
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## Requirements
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Permitted methods for fire protection of emergency feeders
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are specified in [[nfpa-70_700_emergency-systems#700.10(D)(2) Feeder-Circuit Wiring.|700.10(D)(2)]].
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![[nfpa-70_700_emergency-systems#700.10(D)(2) Feeder-Circuit Wiring.]]
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the requirements of which only apply to occupancies listed in
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[[nfpa-70_700_emergency-systems#700.10(D)(1) Occupancies.|700.10(D)(1)]]
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![[nfpa-70_700_emergency-systems#700.10(D)(1) Occupancies.]]
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Note that even in these occupancies only [[nfpa-70_100_definitions#Feeder.|feeders]]
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require fire protection, not [[nfpa-70_100_definitions#Branch Circuit.|branch circuits]].
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## Construction
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> [!info] Keywords
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> * Low Smoke Zero Halogen (LSZH)
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### Fire Resistive Metal-Clad (MC) Cable
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[[nfpa-70_330_mc-cable|330 Metal-Clad Cable: Type MC]]
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### Mineral Insulated (MI) Cable
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[[nfpa-70_332_mi-cable|332 Mineral-Insulated, Metal-Sheathed Cable: Type MI]]
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When terminating single conductors in a ferrous metal enclosure,
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it is necessary to terminate MI cables in a brass plate
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to prevent heating due to ferroelectric hysteresis
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Cut out and replace a section of the enclosure with the plate
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When cutting a hole in the enclosure would void its listing,
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or is otherwise not allowed,
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the cables can be terminated through a brass plate into a junction box
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and power brought to the enclosure through a conventional raceway.
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> [!info]
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> According to Pyrotenax literature,
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> the intermediate junction box method is obligatory
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> for fire pump controllers.
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### Fire Resistive Cable-in-Conduit (CIC)
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## Resources
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[VITALink Fire-Rated Cables | OmniCable](https://www.omnicable.com/vitalink/)
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[Lifeline® Fire Rated Cable Systems | Prysmian](https://na.prysmian.com/markets/electrification/industrial-and-construction/building-wire/fire-resistive-cable-systems)
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[Chemelex Pyrotenax](https://www.chemelex.com/en-us/pyrotenax)
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