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OO 1997 Portland General Electric. All rights reserved <br />: ~ A siil under the~door needs to be provided to prevent oil from leaving the vault and~water from <br />entering. The sill should be a minimum of 4 inches and a maximum of 6 inches high (NEC <br />450-43b). <br />All vent openings should be designed such that water does not enter the vaalt. PGE will seal <br />all duct openings to prevent water from entering the vault. <br />.. _ r _ ~. . . r.: ~~r ~~: _ _ , . <br />1. The Vault Handbool~, March 26, 1980, PGE. <br />2. 1993 National Electric Code. <br />3. PGE Tariffs Book, January 1, 1996. <br />4. Oregon Electric Service Requirements Manual, August 8, 1995 <br />PGE PROPRIETARY MATERL4L - THIS INFO IS BASED ON ASSUMPTIONS 3 CRRERIA WHICH MAY NOT BE VALID OUTSIDE THE PGE ELECTRIC SYSTEM - FOR INTERNAL USE ONLY <br />UNDERGROUND BUILDING CLASS A X DESIGN ~ ~ CONSTRUCTION <br />VAU LTS T& D STANDARDS <br />UNDERGROUND DATE 08-09-96 <br />P.G.E. CO. STANDARD LD-310-07-12 <br />~!~~e ~~~~l~~*. ~~ ~ <br />