Electrical Room Door Fire Rating Requirements

1 1 1 with the exception of fabric fire safety curtain assemblies this standard addresses assemblies that have.

Electrical room door fire rating requirements.

Vaults are definitely different from electrical rooms. Please note that electrical room may require fire rated walls see nfpa 110 5 2 1 5 2 2. This standard regulates the installation and maintenance of assemblies and devices used to protect openings in walls floors and ceilings against the spread of fire and smoke within into or out of buildings. Nfpa 75 appendix c fig b 1.

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

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.