Electrical · E-QSCDJ

Main Breaker

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This electrical one-line diagram details a power distribution setup fed by an eight hundred amp service. A two hundred twenty-five kilovolt-ampere transformer rated for four hundred eighty to two hundred eight y over one hundred twenty volts, three-phase, four-wire delta-wye operation steps down the voltage. Grounding is provided using number two-slash-zero copper per the National Electrical Code. An Ansul fire suppression system signal connects to a one hundred twenty-volt relay with normally open and normally closed contacts to operate the main breaker shunt trip. Various sections and panels including designations 3SH1, 3SL1, 3SL2, 1SL1, 2K1, 2K2, and 2SL1 branch off with specific amperage ratings ranging from twenty-two to one hundred amps.

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