Master Electrician Practice Questions - ICC National Standard Master Electrician Exam

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In a standard 120/240-volt single-phase residential service, what is the phase relationship between the two ungrounded conductors?

They are in phase with each other They are 180 degrees out of phase with each other They are 120 degrees out of phase with each other They are 90 degrees out of phase with each other

Correct Answer:

They are 180 degrees out of phase with each other

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