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O 1997 Portland General Electric. All rights reserved <br />y Optional equipment upon approva/ of /ocal fire marshal. ` ~ <br />PGE wouid prefer a pre-action sprinkler system in a vault. This type of system has a <br />water control valve that opens independently of the fuses in the sprinkler heads. <br />PGE's requirements to be met, by a vault sprinkler system, are: <br />1. Accidental opening of sprinkler head will not cause water to spill into vault. <br />2. A lockable control valve is to be located near var~lt entrance for operation by ` <br />PGE when work is performed in vault. <br />3. Control system and piping are for vault only. <br />4. Two separate actions must occur before water is released. <br />The pre-action fire sprinkler system will meet all of the above conditions. A dry-pipe <br />system with "on-off' heads is similar to a pre-action system and is an alte~nate system. <br />A wet-pipe system v~iith "on-off' heads is a second alternate system. Deiuge systems <br />are to be avoided. <br />Foreign Equipment & Ducts <br />Equipment not directly related to electrical service shall not be located inside the vault. <br />uc s an ~ioes not ~s d for I ~trir SPrvirP ehn~ ~Irl ~~+ ~ass through the va~lt ar a <br />(NEG 450-47). <br />Equipment Layout and Vault Sizing {Commercial Buildings) <br />Determining the required size of a vault is dependent on the amount of equipment in the vault <br />and the room required to operate the equipment safely. In general, the vault shall be no <br />smafler than the dimensions necessary to allow three cubic feet per kVA of maximum <br />transformer capacity. If exposed live parts (fuses, switches) are in the vault, minimum height <br />is 13 feet. Maximum height of a vault should be 20 feet so the duct work can be done with <br />ladders. <br />Items to consider when laying out a vault are: <br />1. Electrical clearances required for safety and operating equipment. (See N~C 710-33 <br />and NEC 110-34.) <br />• Nine feet from any exposed live parts to personnel. <br />• 7.5 inches between phases at 12.5 kV. <br />• Four inches from 7.2 kV to ground. <br />PGE PROPRIETARY MATERIAI - THIS INFO fS BASED ON ASSUMPTIONS 8 CRITERUI WHICH MAY NOT BE VALID OUTSIDE THE PGE ELECTRIC SYSTEM - FCR !MERNAL USE ONLY <br />UNDERGROUND BUILDING CLASS A <br />VAU LTS <br />UNDERGROUND <br />P.G.E. CO. STANDARD <br />X I DESIGN ~ I CONSTRUCTION <br />I T&D STANDARDS ~ <br />DATE 08-09-96 <br />LD-310-07-05 <br />_ <br />~~r"~ Y-Menu - Close ~- <br />