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159 <br />D RAFT North Carolina 911 Board Operating Standards — Version 04/14/2011 D RA FT <br />1 4.5.3.1 A feed from a commercial utility distribution system <br />2 4.5.3.2 An engine -driven generator installation or equivalent designed for continuous operation, where a <br />3 person specifically trained in its operation is on duty at all times <br />4 4.5.3.3 An engine -driven generator installation or equivalent arranged for cogeneration with commercial <br />5 light and power, where a person specifically trained in its operation is on duty or available at all times. <br />6 4.5.4 Secondary Power Source. <br />7 4.5.4.1 The secondary power source shall consist of one or more standby engine -driven generators. <br />8 4.5.4.2 Upon failure of primary power, transfer to the standby source shall be automatic. <br />9 4.5.5 Stored Emergency Power Supply System ( SEPSS) shall be provided for telecommunications <br />10 equipment, two -way radio systems, computer systems, and other electronic equipment determined to be <br />11 essential to the operation of the Public Safety Answering Point. <br />12 4.5.5.1 The SEPSS shall be of a class that is able to maintain essential operations long enough to <br />13 implement the formal Comprehensive Emergency Management Plan. <br />14 4.5.5.2 The instrumentation required to monitor power shall be remotely annunciated in the operations <br />15 room. <br />16 4.5.6 Power circuits shall include their associated motors, generators, rectifiers, transformers, fuses, <br />17 and controlling devices. <br />18 4.5.6.1 The power circuit disconnecting means shall be installed so that it is accessible only to authorized <br />19 personnel. <br />20 4.5.6.2 Surge Arresters otherwise known as Transient Voltage Surge Suppression ('IVSS) shall be <br />21 provided for protection of telecommunications equipment, two -way radio systems, computers, and other <br />22 electronic equipment determined to be essential to the operation of the Public Safety Answering Point. <br />23 4.5.7 Isolated Grounding System. Telecommunications equipment, two -way radio systems, computers, <br />24 and other electronic equipment determined to be essential to the operation of the Public Safety Answering <br />25 Point shall be connected to an isolated grounding system. <br />26 4.5.8 Engine -driven generators shall be sized to supply power for the operation of all functions of the <br />27 Public Safety Answering Point. <br />28 4.5.8.1 When installed indoors, engine -driven generators shall be located in a ventilated and secured area <br />29 that is separated from the Public Safety Answering Point by fire barriers having a fire resistance rating of <br />30 2 hours or better. <br />31 4.5.8.2 When installed outdoors, engine -driven generators shall be located in a secure enclosure. <br />32 4.5.8.3 The area that houses an engine - driven generator shall not be used for storage other than spare parts <br />33 or equipment related to the generator system. <br />Page 6 <br />