If 15- and 20-ampere duplex receptacles are not marked with CO/ALR, they are suitable for use with which conductors?

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Multiple Choice

If 15- and 20-ampere duplex receptacles are not marked with CO/ALR, they are suitable for use with which conductors?

Explanation:
The key idea is that a receptacle’s markings tell you which conductors it is designed to accept. If a 15- or 20-amp duplex receptacle isn’t marked CO/ALR, it is intended for copper conductors only. Copper-clad aluminum conductors have a copper outer layer, so the connection at the terminal behaves like copper and is generally acceptable for these non-CO/ALR devices. Pure aluminum conductors, on the other hand, are not suitable unless the device is CO/ALR or specifically rated for aluminum. That’s why copper and copper-clad aluminum conductors are the appropriate choices for a receptacle not marked CO/ALR.

The key idea is that a receptacle’s markings tell you which conductors it is designed to accept. If a 15- or 20-amp duplex receptacle isn’t marked CO/ALR, it is intended for copper conductors only. Copper-clad aluminum conductors have a copper outer layer, so the connection at the terminal behaves like copper and is generally acceptable for these non-CO/ALR devices. Pure aluminum conductors, on the other hand, are not suitable unless the device is CO/ALR or specifically rated for aluminum.

That’s why copper and copper-clad aluminum conductors are the appropriate choices for a receptacle not marked CO/ALR.

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