Wiring standards Single phase 2 wire 120 V

Wiring standards • Single phase, 2 -wire 120 V or 220 V • Single phase, 3 -wire • 220 V between phases ; 110 V between phase-neutral • Three phases, 3 -wire • No neutral ; 220 V between phases • Three phases, 4 -wire • 220 V between phase-neutral ; 380 V phase-phase http: //www. analog. com/energymeter

Fault Tolerant Energy Metering AD 7751 - monitor phase and neutral currents http: //www. analog. com/energymeter

Anti-Tamper 2 wire, 1 f Meter Example AD 7751: 1 f, Real Pwr, anti-pilfer, Motor Drive Neutral Input Side Load Side Phase Fault Detection LED Counter ac to dc Power Supply k. W-H 0 0 9 8 2 3 7 +5 V IPhase PGA ADC 1 A 10011. . . Residential Outllets AD 7751 IPhase>INeut 11100. . . Line Voltage Stepdown INeut PGA ADC 1 B X IPhase<INeut 10110. . . Digitalto. Frequency Digital Comparator * V Gain Calibration 11100. . . ADC 2 11110. . . Reverse Polarity LED *Note: http: //www. analog. com/energymeter Digital Comparator Selects > of IPhase or INeutral Calibration LED

Basic 2 wire, 1 f Meter Example AD 7750/5: 1 f, Real Pwr, Motor Drive output Neutral Input Side Load Side Phase Counter ac to dc Power Supply k. W-H 0 0 9 8 2 3 7 +5 V Residential Outllet AD 7750/5 PGA ADC 1 101011. . . 1101. . Line Voltage Stepdown X ADC 2 Digitalto. Frequency 111001. . . Calibration LED Gain Calibration Reverse Polarity LED http: //www. analog. com/energymeter

ADE 7756/3: Processor based Meter Example (remote reading or multi-tariff billing) Neutral Load Side Phase Comm ac to dc Power Supply EEPROM Input Side +5 V ADE 7756/3 PGA ADC 1 1011. . . X ADC 2 1101. . Registers & Serial Interface MCU & LCD Driver Calibration DTF Calibration LED http: //www. analog. com/energymeter LCD Display Residential Outllet