708-Critical Operations Power Systems: Page 7 of 7

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The performance test is not intended to verify selectivity in 708.52(D), as this is often coordinated similarly to circuit breakers by reviewing tie and current curves and properly setting the equipment. (Selectivity of fuses and circuit breakers is not performance tested for overload and short circuit.)

(D) Selectivity. Ground-fault protection for operation of the service and feeder disconnecting means shall be fully selective such that the feeder device, but not the service device, shall open on ground faults on the load side of the feeder device. A six-cycle minimum separation between the service and feeder ground-fault tripping bands shall be pro vided. Operating time of the disconnecting devices shall be considered in selecting the time spread between these two bands to achieve

100 percent selectivity.
FPN: See 230.95, FPN No. 4, for transfer of alternate source where ground-fault protection is applied.

708.54 Coordination. Critical operations power system(s) overcurrent devices shall be selectively coordinated with all supply side overcurrent protective devices.

V. System Performance and Analysis

708.64 Emergency Operations Plan. A facility with a COPS shall have documented an emergency operations plan. The plan shall consider emergency operations and response, recovery, and continuity of operations.

FPN: NFPA 1600-2007, Standard on Disaster/Emergency Management and Business Continuity Programs, Section 5.7, provides guidance for the development and implementation of emergency plans.