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Office Policy: Fire Protection of Transformer Vaults

From: Fire Marshal M. M. Stone
Date: October 2, 1997

image of people working Recent developments in various construction projects have raised concerns of fire protection in main electrical service transformer vaults. The following will be considered as Office Policy for all projects permitted after this date.

 image of welderDesign Criteria

This office recommends the installation of service main electrical transformers be located outside the footprint of the building they serve.

When service main electric transformer vaults are located within the footprint of the building, the following design criteria shall be used for vault construction.

Total enclosure with 4-hour fire resistive construction

Class "A" opening protective

All penetrations sealed with tested assemble for that use

Fire detection equipment tied to the buildings fire alarm system

Transformers shall be the only equipment permitted within the vault area

Signage shall be provided on the exterior of walls indicated "High Voltage"

Signage shall be provided on the entry doors indicating:

"Authorized personnel only"

"Emergency phone numbers"

Access shall be regulated by the utility company

Sprinkler heads shall be deleted from the vault area as with the above listed requirements the vault area can be classified as outside of the building.

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