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Mike
Mike, Master Electrician
Category: Electrical
Satisfied Customers: 1425
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: 1 year ago.
Category: Electrical
Expert:  Jason replied 1 year ago.

Hello. Welcome to Just Answer.

Expert:  Jason replied 1 year ago.

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

Customer: replied 1 year ago.
Taking the readings at the breaker box, where the wires enter the buses
Customer: replied 1 year ago.
I'm checking the total number of circuits now
Customer: replied 1 year ago.
It's actually every other circuit
Customer: replied 1 year 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 1 year ago.

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

Expert:  Jason replied 1 year 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 1 year ago.

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

Customer: replied 1 year ago.
Okay, so turn off all double poles, check the mains
Expert:  Jason replied 1 year ago.

Yes, exactly.

Customer: replied 1 year ago.
Okay with all double poles off, still getting 120v to both mains
Expert:  Jason replied 1 year ago.

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

Expert:  Jason replied 1 year ago.

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

Expert:  Jason replied 1 year 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?