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3-phase ampacity amps armored cable automatic transfer switch ballast bend bonding jumper branch circuit building busway cable tray capacitors ceiling Check circuit breakers Code coil conduit connected contactor contacts control circuits cost cuit demand control diagram disconnecting means distribution electrical practice electricians enclosure energy engineers equipment fault feeder ﬁeld ﬁrst ﬁxtures ﬂoor ﬂuorescent full-load current fuses grounding conductor heat pump heaters heating identiﬁed installed insulation lamps leads lighting load located luminaires magnetic maintenance maximum ment mercury-vapor lamps meter motor circuits motor control mounted normal ohmmeter one-line diagram operation overcurrent overload relay panel permits phase plant protective device pump riser running Section short-circuit sizes speciﬁc starter steel supply Swbd switch switchgear tanks temperature terminals thermal tion torque transformer trip units utility utility vaults voltage volts wiring