21 of the National Electrical Code® (NEC®) covers electrical system penetrations through fire-resistant rated wall, partitions, floors, or ceilings. The main purpose of this requirement is to control the possible spread of fire or products of combustion. Airports, Railway Stations, Metro Stations: Power distribution for security screening systems, communication systems, control centers, firefighting systems, emergency lighting, evacuation signage systems, and lifts/escalators. Large Stadiums, Convention Centers, Theaters: Power distribution for. A fire-rated electrical room is designed for one of two reasons – to contain fires and prevent their spread or to prevent fires outside the electrical room from entering the room. The required fire rating is for a defined period, typically one or two hours.
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