24 normal ambulatory and clinic source all other

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2.4 Normal Ambulatory and Clinic Source . All other health care facilities will be served by a single-ended substation distribution system with coordinated surge and fault protection. The primary service feeder will be designed to carry full demand plus 20 percent spare load growth capacity. 2.5 Transient Protection . Systems that incorporate solid-state devices are susceptible to electrical system transients that can cause system malfunction or equipment component damage. Unless specifically required for specific items of equipment by an A&E (designer) evaluation of solid-state requirements for intensive care areas and approved for installation, power conditioning equipment will normally not be installed as part of the building electrical system at the utilization point. Systems that utilize solid state devices will be provided with transient protection. Static Uninterruptible Power System (UPS) will normally be provided with the equipment and system being served. However, requirement or provisions for UPS will be determined on a project-by-project basis. Provisions for future installed power conditioning equipment will be determined on a project-by-project basis. 2.6 Grounding. System ground shall be adequate for safety and for reliable operation of sensitive Users' and facility equipment. Typical communications system equipment © J. Paul Guyer 2010 10
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used in hospitals requires five ohm system ground for proper operation. All grounding systems will be bonded together as required by NFPA 70. 3. ALTERNATE POWER SOURCE . 3.1 Alternate Electrical Source . The alternate electrical source will conform to NFPA- 70 and 99 except where Service criteria listed in Table 9-1 have more stringent requirements. Additional load capacity may be provided those hospitals assigned mobilization or mass casualty response missions, or located in an area where extended power outages are frequent. The emergency power source will be designed as a separately derived power source. True RMS metering will be provided for load monitoring. 3.2 Ambulatory Care Centers and Clinics . An alternate power source shall be provided if required by NFPA-99. If an on-site generator set is not required by NFPA-99 and 70, approval must be justified. The justification will address contingency requirements, local power requirements, and safety for human life. 3.3 Medical and Dental Clinic. Where any concentration of inhalation anesthetic or intravenous sedation is used or any electrical life support or resuscitative equipment is used in medical or dental clinics, an alternate source of power is required in accordance with NFPA-70, and NFPA-99. The alternate source of power will be either a generator, battery system, or self-contained battery internal with the equipment and will have the capacity to sustain its full connected load at rated voltage for a minimum of 1 and 1/2 hours. The system will be so arranged that the alternate source of power shall be automatically connected to the load within 10 seconds. The essential electrical system
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