2011 Electric Service Requirements Manual, 2nd - Pacific Power

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Section 5 2011 Electric Service Requirements, 2 nd Edition Requirements: 1. Distances noted in Section 5.5 and Table 5.5 are from the pad. 2. If the building has an overhang, the distance is measured from the outside edge of the overhang. 3. Outside walkways or stairs attached to the building are considered part of the building. Minimum clearances must also be maintained from walkways used for exiting to a place of safety. 4. Distances less than those specified in Table 5.5 (but not less than the required working space) may be allowed if approved by the appropriate code enforcement authority. This may require alternate means of fire protection per NEC Section 450.27 and NESC Section 152(A)(2), including fire barriers, fire-rated walls, sprinkler systems, oil-containment means, or other measures. Use of alternate means of fire protection must be approved by the local code enforcement authority. 5. The final grade at the location of the transformer shall provide oil drainage away from the building. Otherwise, an oil containment means is required. 6. The customer shall conform to all local building codes, insurance regulations, and/or ordinances affecting the transformer location. 7. Combustible/non-combustible construction types are defined by respective state building codes. 8. No vegetation other than grass or sod shall be present in the clear workspace. 9. Trip hazards such as gutters, spigots, etc., shall not exist within the clear workspace. Curbs may be acceptable in the clear workspace; contact the Power Company during site scoping. 10. A minimum 6-foot (6') clearance between fire hydrants and metallic padmounted equipment shall be maintained. This clearance may be reduced to 4 feet (4') for non-metallic equipment. Greater separation may be required by local ordinances. 11. Where equipment is exposed to vehicle traffic, barrier posts are required; see Section 9.9 and consult the Power Company for installation-specific requirements. 12. Additional clearances may be required for other padmounted equipment. Table 5.5—Clearances Between Oil-Filled Padmounted Equipment and Structures, and Structure Openings Clearance to Side of Framing (ft) Vertical Clearance from Framing (ft) Clearance in Front Type of Framing of Framing (ft) Fire escape 20 10 Doorway 20 10 Window that can be opened 20 10 Solid window 10 5 10 Air vent intake 20 10 25 Air vent exhaust 10 10 25 Combustible surface (single-phase) 8 See Figure 5.5.2 Combustible surface (three-phase) 8 See Figure 5.5.2 Non-combustible surface (single-phase) 3 See Figure 5.5.2 Non-combustible surface (three-phase) 3 See Figure 5.5.2 28 This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation.
2011 Electric Service Requirements, 2 nd Edition Section 5 5.6 Firewalls (Blast Walls) At locations where the space separation is inadequate to provide fire protection, a firewall (also called a blast wall) may be constructed. The firewall shall be constructed such that the heat and flame from a dynamic event are deflected away from the storage tank. The firewall shall be approved by local authorities. Contact the Power Company for information on firewalls. Also see ESR White Paper 5—Firewalls. Figure 5.6 − Firewall Placement firewall Refer to Figure 5.5.2 for clearances around the transformer. The height of the blast wall shall be tall enough to prevent personnel from exposure. As a guideline, this means that someone standing behind the blast wall should not be able to see the generator. direction of deflected blast 5.6.1 Power Company Equipment in Enclosed Spaces The Power Company requires 24-hour access to equipment in gated and enclosed spaces. If a single- or three-phase transformer, padmounted piece of equipment, or pedestal is to be placed in a gated or enclosed space, the Power Company shall be contacted prior to installation. For more information, see ESR White Paper 5—Gated and Enclosed Spaces. This manual shall be distributed and interpreted in its entirety. Individual pages will not represent all the requirements necessary for an installation. 29
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2011 Electric Service Requirements Manual, 2nd - Pacific Power

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