In a distribution circuit, what does the term 'primary' refer to?

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Multiple Choice

In a distribution circuit, what does the term 'primary' refer to?

The primary is the high-voltage side of a distribution transformer. In a distribution circuit, power comes from the upstream network at a higher voltage and is fed into the transformer’s primary winding, which is designed for that high voltage. The transformer then steps the voltage down on the secondary winding to serve customers on the lower-voltage side. So the term refers to the high-voltage input, not the low-voltage output. The neutral is a return path on the low-voltage side, and ground is an earth connection for safety, not the primary. For example, a transformer that steps 12,470 V down to 120/240 V has the 12,470 V side as the primary and the 120/240 V side as the secondary.

The primary is the high-voltage side of a distribution transformer. In a distribution circuit, power comes from the upstream network at a higher voltage and is fed into the transformer’s primary winding, which is designed for that high voltage. The transformer then steps the voltage down on the secondary winding to serve customers on the lower-voltage side. So the term refers to the high-voltage input, not the low-voltage output. The neutral is a return path on the low-voltage side, and ground is an earth connection for safety, not the primary. For example, a transformer that steps 12,470 V down to 120/240 V has the 12,470 V side as the primary and the 120/240 V side as the secondary.

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