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Mike, Master Electrician
Category: Electrical
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Experience:  Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
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I have several circuits that are currently getting partial

Customer Question

I have several circuits that are currently getting partial to no voltage. I have 120v on both lines into the house, and most of my circuits are getting 120v, but I'm only getting 3.75v on several circuits. What are some possible solutions?
Submitted: 9 months ago.
Category: Electrical
Expert:  Jason replied 9 months ago.

Hello. Welcome to Just Answer.

Expert:  Jason replied 9 months ago.

Do you know how many total circuits are affected? Where are you taking the readings?

Customer: replied 9 months ago.
Taking the readings at the breaker box, where the wires enter the buses
Customer: replied 9 months ago.
I'm checking the total number of circuits now
Customer: replied 9 months ago.
It's actually every other circuit
Customer: replied 9 months ago.
I get 120v on one circuit, and then 3.75 at the next, then 120v, etc as I go down each side of the box
Expert:  Jason replied 9 months ago.

Sorry for the delay. Had a phone call from another customer.

Expert:  Jason replied 9 months ago.

This sounds like a dead leg of power. The only reason you would get a good reading on each main is because it's reading through the double pole breakers. If you turn off all double pole breakers, you should be able to isolate one of the mains as being dead.

Expert:  Jason replied 9 months ago.

Or, it could be the main breaker that has the problem.

Customer: replied 9 months ago.
Okay, so turn off all double poles, check the mains
Expert:  Jason replied 9 months ago.

Yes, exactly.

Customer: replied 9 months ago.
Okay with all double poles off, still getting 120v to both mains
Expert:  Jason replied 9 months ago.

Is that when taking a reading from one main breaker lug to other main breaker lug?

Expert:  Jason replied 9 months ago.

When the meter probes are oriented that way, the reading should be around 240 volts, as you probably already know.

Expert:  Jason replied 9 months ago.

If that's the reading you are getting, then the main breaker itself is the problem. Are you able to post a photo of your panel, with all breakers shown?

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