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~4~` c5: ^~ :c;"'/f1iJf~{~.`_:~..'~~ °'."V,lV~7~'°'~"-'~ O 1997 Portland General Electric. All ~ights reserved. 3. The Engineer or Design's supervisor must be consulted when duct runs exceed 300 feet in total length or load exceeds 1200 amperes. 4. To facilitate installation of cables 350 KCM and larger: For cable runs of 150 feet or less with two or less 90 degree bends, no more than two 3-PH circuits should be installed per duct. ,., 1;_ • For cable runs of 151 feet to 300 feet, or of 150 feet or less with three 90 degree bends, single 3-PH circuits should be installed per duct. 5. For cable runs of 151 feet or more, be sure to consider voltage drop criteria before installing conduits. 6. First bend is assumed to be at feeding end of conduit run. If all bends are at pulling end of conduit, consult the Engineer or Designer's supervisor. Miscellaneous Customer Equipment The customer should provide, install, and maintain lighting and electrical outlets inside the vault. Lighting is to meet code restrictions (NEC 220-3b). Recommended lighting load is 2 watts per square foot. Two convenient 20 amp, 120 volt outlets should be provided in large vaults. One outlet is adequate in smaller vaults (8' x 12'). If fans are installed in the vault (for ventilation), they will typically be 30 amp, 208v, 3-phase. The customer shall provide and maintain electric service for them. Access into the vault by the customer for maintenance is to be coordinated through PGE. Grounding The customer should provide an earth ground to which PGE will attach. Size of the ground (250 KCM BSD) is according to National Electric Code (NEC), Article 250, and especially Table 250-94. The customer should ground all customer-owned metal equipment in the vault, such as doors, grates, lighting fixtures, sprinkler pipes, etc. Sumps and Sills A sump should be provided in the vault according to NEC 450-46. It would need to be large enough to contain the oil from one transformer, an area 18" x 18" x 12" is recommended. The drain line shall not be connected to a sewer system unless approved by the municipality having jurisdiction. The customer must obtain this approval. The customer would be responsible for pumping the sump if water accumulates in it. PGE would remove any transformer oil collected in the sump. A removable grate should be provided over the sump; this is the customer's responsibility. PGE PROPRIETARY MATERIAL - THIS INFO IS BASED ON ASSUMPTIONS 8 CRffERIA WHICH MAY NOT BE VALID OUTSIDE THE PGE ELECTRIC SYSTEM - FOR INTERNAL USE Ot~Y UNDERGROUND BUILDING CLASS A VAU LTS UNDERGROUND XI DESIGN CONSTRUCTION P.G.E. CO. STANDARD I T& D STANDARDS ~ DATE 08-09-96 LD-310-07-11 ~Baek ~ ~ -= Menv~ C(ose '-=~