For all 3-wire single-phase service loads on 120-208 volt networks, the meter shall be of which type?

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Multiple Choice

For all 3-wire single-phase service loads on 120-208 volt networks, the meter shall be of which type?

In a 3-wire single-phase service, there are two hot conductors carrying current to and from loads. The total energy used comes from both legs, so you need a meter that can monitor both currents. A two-element meter has separate current paths for each leg and a common voltage circuit, allowing it to sum the energy from both wires and give the true total for the service. A three-element meter is designed for three-phase systems with three independent currents, which isn’t applicable here. A single-element meter only measures one current path, so it would miss energy on the other leg. Therefore, the two-element meter is the appropriate choice.

In a 3-wire single-phase service, there are two hot conductors carrying current to and from loads. The total energy used comes from both legs, so you need a meter that can monitor both currents. A two-element meter has separate current paths for each leg and a common voltage circuit, allowing it to sum the energy from both wires and give the true total for the service. A three-element meter is designed for three-phase systems with three independent currents, which isn’t applicable here. A single-element meter only measures one current path, so it would miss energy on the other leg. Therefore, the two-element meter is the appropriate choice.

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