PROVISIONS FOR TRANSFORMER VAULTS


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PROVISIONS FOR TRANSFORMER VAULTS
PROVISIONS FOR TRANSFORMER VAULTS142. Location. Vaults shall be located where they can be ventilated to the outside air without using flues or ducts wherever such an arrangement is practicable.143. Walls, roofs, and floors. The walls and roofs of vaults shall be constructed of reinforced concrete, brick, load-bearing tile, concrete block, or other fire-resistive constructions, which have adequate structural strength for the conditions and a minimum fire resistance of 3 h according to Method for Fire Tests of Building Construction and Materials, ANSI/ASTM E119-1995, Standard Methods of Tests of Fire Endurance of Building Construction and Materials, NFPA 251-2006. The floors of vaults in contact w…
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. PROVISIONS FOR TRANSFORMER VAULTS, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export