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(a) Strength. Vault structures shall have sufficient strength to withstand the loading to which they may be subjected and to support the equipment mounted therein.
(b) Wall Material. Vault interior walls shall be of assemblies of materials approved for not less than one-hour, non-combustible fire-resistive construction.
(c) Doors. Door openings to vaults shall be protected by approved one-hour rated fire door and frame assemblies.
(d) Ceiling Access. Vault ceiling access opening covers or grates weighing less than 100 pounds shall be securely fastened in place.Openings must be minimum of 26 inches diameter or 24 inches by 26 inches in size. Safe access shall be provided from the opening to the floor or other working surface.
(e) Ventilating Ducts. All ventilating flues or ducts shall be of noncombustible construction.
(f) Ventilating Openings. Ventilating openings shall not be through the vault door, except where door opens to outdoors.
(g) Adequate Ventilation. Vaults shall be provided with means for ventilation adequate to prevent equipment temperatures in excess of those at which the equipment may be safely operated.
(h) Drainage. Where drainage from sumps in vaults is to a sewage system, a suitable trap shall be installed capable of preventing the entrance of sewer gas into the vault.
(i) Foreign Pipes and Accessories. Pipelines such as sewer, water, gas, oil, etc., in as far as is practicable, shall be installed outside the vault enclosure unless they constitute an integral part of operation of the equipment installed in the vault. Where it is impracticable for such lines to be installed outside the vault, they shall contain no appurtenances (such as valves, faucets, or fittings) inside the vault that require maintenance.
(Title 24, Part 3, Section 3-110-35.)
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.
HISTORY
1. Editorial correction including renumbering of former Article 66 to Article 17 filed 11-2-83 (Register 83, No. 45).
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