Electrical · E-9CNNJ

Automatic Transfer Switch "Ats."

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This electrical riser diagram outlines a 300-ampere, 480Y/277-volt, 3-phase, 3-wire automatic transfer switch with a solid neutral. Power is supplied from a 130-kilowatt, 480Y/277-volt, 3-phase, 4-wire natural gas-powered emergency generator set housed in a NEMA 3R enclosure. Control wiring and battery charger connections are routed per the manufacturer's specifications. The system feeds panel EH2A, which further distributes power to panel EH2B and a 30 kVA transformer TE2A serving panel EL2A. A separate branch supplies a 75 kVA transformer T1B connected to panel L1B with a number 4 copper ground.

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