On the front plate of a watt-hour meter, which item is not required?

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Multiple Choice

On the front plate of a watt-hour meter, which item is not required?

The basic job of the front plate is to communicate essential electrical ratings and identity so the meter can be installed and used correctly. Two things that must be clear are the energy unit the meter measures (watt-hours) and the system frequency it’s designed for (frequency rating). These ensure you connect the meter to the right type of supply and understand what it measures. Accuracy class, on the other hand, is about how precise the meter’s readings are under defined conditions. That performance detail isn’t required to be displayed on the front plate; it’s normally found in certification documents, datasheets, or calibration certificates. So accuracy class isn’t a mandatory front-plate item, which is why it’s the correct choice.

The basic job of the front plate is to communicate essential electrical ratings and identity so the meter can be installed and used correctly. Two things that must be clear are the energy unit the meter measures (watt-hours) and the system frequency it’s designed for (frequency rating). These ensure you connect the meter to the right type of supply and understand what it measures.

Accuracy class, on the other hand, is about how precise the meter’s readings are under defined conditions. That performance detail isn’t required to be displayed on the front plate; it’s normally found in certification documents, datasheets, or calibration certificates. So accuracy class isn’t a mandatory front-plate item, which is why it’s the correct choice.

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