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3-phase 3-wire circuit 90 degrees accuracy alternating current ampere-hour amperes angle balanced ball calibration cent load current transformers damping delta connected demand pointer demand register dial duplex recorder eddy currents electrical electromagnet four-wire four-wire circuits friction frictional torque full load gear train indicating induction installations INSTRUMENT TRANSFORMERS interval kilovolt-ampere hours kilowatt hours lagging power factor load curve magnetic circuit maximum demand measured mechanism meter coils meter element method neutral operation per-cent permanent magnet phase phase-angle errors POLYPHASE METER APPLICATIONS potential coil potential transformer primary current reactive meter reading RECORDING DEMAND METERS reset revolutions rotation secondary current service meter shaft Shallenberger shown in Fig single-phase meter speed standard temperature test meter three-element meter three-phase three-wire tion torque two-element meter two-phase unity power factor voltage coils voltage transformer voltage unbalance volts WATTHOUR AND DEMAND watthour constant watthour meter wattmeter watts Westinghouse wire worm zero