Energy meters are used to measure electrical energy meters, also known as watt-hour meters, fire meters, kwh meters, refers to the measurement of various electrical quantities of the instrument.
When using the Watt-hour meter, note that in the case of low voltage (no more than 500 volts) and small current (dozens of Ann), the Watt-hour meter can be directly connected to the circuit for measurement. In the case of high voltage or large current, the watt-hour meter can not be directly connected to the line, and must be used with a voltage transformer or current transformer.
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