Delivery rooms and other similar areaslocations may

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delivery rooms, and other similar areas/locations may be a “Wet Procedure Location” as defined by 1.2.3. 2. EXTERIOR ELECTRICAL . 2.1 Exterior electrical systems shall conform to ANSI-C2, "National Electrical Safety Code," except where Service technical criteria have more stringent requirements. 2.1.1 Common Voltages. 4.16kv, 12.47kv, 13.2kv, 13.8kv and 34.5kv are common distribution voltages. However, 12.47kv, 13.2kv, and 13.8kv are the normal distribution voltages serving medical facilities. 2.2 Normal Source Site Investigation . Coordinate electrical utility siting with other utilities. Provide underground distribution on site, and visual screening by location or landscaping elements, where appropriate for the project, to improve overall site aesthetics. 2.3 Normal Hospital Source . For electrical design criteria related to power supply, see documents listed in Table 9-1. Hospitals will be served by two primary service feeders each serving one end of a double-ended substation or to a selector switch serving a multi-ended network substation. Each feeder shall be able to carry the full hospital demand plus 20 percent spare load growth, and shall be installed in an underground concrete encased ductbank within the hospital site. Dual primary feeders serving both © J. Paul Guyer 2010 8
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ends of a double-ended substation, through a primary selector switch, must have prior approval of the regulatory authority before incorporation into a design. Service feeders will be connected to different power sources, if available, and to two differently routed distribution system feeders. Where two power sources are not available, the service feeders may be connected to two different sections of a true loop system (A true loop system configuration is where both ends of a utility primary feeder originates from different substations or switching stations, or different breakers and transformers in the same substation and has the capacity to serve the total loop load from either end.). Manually operated primary selector switch and fused load break disconnect switch will be provided for each transformer as indicated in Figure 9-1. Figure 9-1 Hospital One-Line Diagram © J. Paul Guyer 2010 9
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Transformers will normally be located outside the hospital, but may be located within the building where practicable and economical. Double-ended unit substation distribution systems will be designed for hospitals, medical centers and specially designated facilities. The double-ended substation configuration shall be arranged for easy expansion from each end. Each transformer in the double-ended unit substation will be sized to serve approximately 60-70 percent of the substation demand load (linear and nonlinear) before forced air cooling is initiated and 100% of demand load with forced air cooling initiated and will be impedance matched. All double-ended unit substations will have coordinated surge and fault protection. System protection will be selective. The normal power system main equipment shall not be located below finish grade level.
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