What is the typical voltage of a residential branch circuit in the US?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Study for the ESCO Electrical Employment Ready Test. Prepare with practice questions, hints, and detailed explanations for each question. Get ready for your electrical certification exam!

Multiple Choice

What is the typical voltage of a residential branch circuit in the US?

Explanation:
The typical branch circuit in a US home provides about 120 volts AC. This comes from the split-phase service where each branch circuit uses one hot leg relative to neutral, giving roughly 120 V. The two hot legs are opposite in phase, so between them you’d have 240 V, which is why large appliances use dedicated 240 V circuits. The voltage can vary a bit in practice (often around 114–125 V), but 120 V nominal is the standard for lighting and receptacle circuits. DC is not used for these standard branch circuits. That’s why the correct choice is 120 VAC nominal.

The typical branch circuit in a US home provides about 120 volts AC. This comes from the split-phase service where each branch circuit uses one hot leg relative to neutral, giving roughly 120 V. The two hot legs are opposite in phase, so between them you’d have 240 V, which is why large appliances use dedicated 240 V circuits. The voltage can vary a bit in practice (often around 114–125 V), but 120 V nominal is the standard for lighting and receptacle circuits. DC is not used for these standard branch circuits. That’s why the correct choice is 120 VAC nominal.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy