Electrical Room Door Fire Rating Requirements

A 1 1 see annex k for general information about fire doors.

Electrical room door fire rating requirements.

These electrical rooms are small 2 hour fire rated enclosures entered by a 90 minute fire rated door from each floor and the floor slab penetration of the vertical cables or busbars rising along the building through the corners of these rooms are horizontally sealed by 2 hour fire rated mortar. Please note that electrical room may require fire rated walls see nfpa 110 5 2 1 5 2 2. Electrical room exit requirement jbartos electrical 22 apr 04 22 14. Vaults are definitely different from electrical rooms.

Outside of working and dedicated space needs there are many special considerations for electrical rooms that depend on building programs as well as exterior. You are correct that electrical vaults containing equipment with 600 amps or greaters must have at least 3 hour rated walls and 3 hour rated floors if there are any floors underneath the vault. Nfpa 75 appendix c fig b 1. Typically the main electrical room has walls fire rated at 1 hour.

Locating electrical rooms next to these especially if placed between should be carefully evaluated to ensure there is enough space and flexibility for conduits.