---
title: Fire Resistive Wiring Methods
tags:
  - type/encyclopedia-entry
up: "[[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.|700.10(D)(2)]].

![[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.|700.10(D)(1)]]

![[nfpa-70_700_emergency-systems#700.10(D)(1) Occupancies.]]

Note that even in these occupancies only [[nfpa-70_100_definitions#Feeder.|feeders]]
require fire protection, not [[nfpa-70_100_definitions#Branch Circuit.|branch circuits]].

## Construction

> [!info] Keywords
> * Low Smoke Zero Halogen (LSZH)

### Fire Resistive Metal-Clad (MC) Cable

[[nfpa-70_330_mc-cable|330 Metal-Clad Cable: Type MC]]

### Mineral Insulated (MI) Cable

[[nfpa-70_332_mi-cable|332 Mineral-Insulated, Metal-Sheathed Cable: Type MI]]

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](https://www.omnicable.com/vitalink/)

[Lifeline® Fire Rated Cable Systems | Prysmian](https://na.prysmian.com/markets/electrification/industrial-and-construction/building-wire/fire-resistive-cable-systems)

[Chemelex Pyrotenax](https://www.chemelex.com/en-us/pyrotenax)