Electrical · A-WWGH9

Electrical One-Line Diagram for 480V to 208/120V Distribution Transformer and Panels

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An electrical distribution single-line diagram details the connection from a 1200A three-phase main distribution panel feeding an 800A NEMA 1 main circuit breaker panel designated ASHP-B1-1 at 480 volts with a 50,000 AIC rating. A feeder conduit A8003 runs 104 feet with a 1.25 percent voltage drop and 47,997 available fault current. A secondary branch circuit from the main distribution panel feeds a 45 kVA transformer with a 480 volt primary and 208/120 volt secondary via a 70A three-phase breaker and 16 feet of conduit with a 0.88 percent voltage drop. The transformer steps down power to a 225A NEMA 1 main circuit breaker panel designated 1-OLP-6A with a 150AT, 225AF capacity and 10,000 AIC rating through a 17-foot feeder with a 0.88 percent voltage drop and 6,283 available fault current, utilizing a number 6 ground.

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