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100 per cent ammeter amperes apparatus arrangement average load average power boilers capacity central station central-station circular mils CM CM coil computed connected load connected-load factor consumers cost decreases demand factor demand imposed demand meter determined devices direct current direct-current distribution system diversity factor economical engine equation equipment example Example.—What feeder flow formula 54 graphic Hence high voltage illustrated indicated induction installation insulation interval kilowatts lightning arrester line reactance load factor load graph maximum demand motor National Electrical Code obtained ohms operating panel plant factor power factor power load practice pressure prime movers rated resistance safely carry serve shown in Fig single-phase steam substation switch switchboard three-phase three-phase circuit three-wire tion transformers turbine two-phase two-wire unit usually values voltage drop voltage impressed voltage regulator volts drop watt-hour meter wattmeter watts windings wire