4.1. ERMUSR 09-10-2019 - Laserfiche WebLink

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reasons. Facilities with line-commutated synchronous inverters shall have the inverters connected on the load side of the safety disconnect switch. Back Feed Protection—The Customer agrees, if requested,to supply ERMU with a schematic diagram and associated equipment list for the generating facility control circuitry to enable ERMU to determine if the generation facilities safety equipment provides a level of safety consistent with the safety level required by ERMU for its electrical equipment and employees. Connection to ERMU's distribution system shall only be made through an ERMU approved interconnection device that will prevent back feed. A disconnecting device shall be installed to electrically isolate the Distribution System from the Customer Generator. The only exception for the installation of a visible disconnect is if the Customer Generator is interconnected via a mechanically interlocked open transfer switch and installed per the NEC (702.6) "so as to prevent the inadvertent interconnection of normal and alternate sources of supply in any operation of the transfer equipment." The visible disconnect shall provide a visible air gap between the Customer Generator and the Distribution System in order to establish the safety isolation required for work on the Distribution System. This disconnecting device shall be readily accessible 24 hours per day by ERMU personnel and shall be capable of padlocking by ERMU personnel. The disconnecting device shall be lockable in the open position. The visible disconnect shall be a UL approved or National Electrical Manufacturers Association (NEMA) approved manual safety disconnect switch of adequate ampere capacity. The visible disconnect shall not open the neutral when the switch is open. A draw-out type circuit breaker may be used as a visual open. The visible disconnect shall be labeled"Generation Disconnect"to inform ERMU personnel. Energizing of Equipment by Generation System—The Customer Generator shall not energize the de-energized Distribution System. The Customer shall install the necessary padlocking(lockable) devices on Customer Generator to prevent energizing the de-energized Distribution System. Lock out relays shall automatically block the closing of breakers or transfer switches onto the de-energized Distribution System. Grounding Issues—Grounding of sufficient size to handle the maximum available ground fault current shall be designed and installed to limit step and touch potentials to safe levels as set forth in"IEEE Guide For Safety In AC Substation Grounding", ANSI/IEEE Standard 80". 3 133