This electrical single line diagram details weatherproof mechanical distribution board "HDAR" rated for 1600 amperes, 480 volts, three-phase, three-wire service. The distribution board feeds six rooftop units, designated RTU-A1 through RTU-A6, each rated at 145 kilowatts with an associated motor and variable frequency drive. Each rooftop unit feeder is protected by a 225 ampere, three-pole breaker. An additional spare circuit provides four 225 ampere spaces on the 1600 ampere, three-pole main bus.
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