I have an main circuit breaker panel with a 200 amp breaker and a 60 amp breaker. the main feed comes into top of 200 amp breaker and then 2 wires come out of the bottom of it and into a 60 amp breaker. They then run out of the bottom of the 60 amp breaker and into a subpanel with a 50 amp breaker, 30 amp breaker and 15 amp breaker. I tested the voltage between hot and neutral at the main panel, after the 60amp breaker, and both hots read 120v. But when I test the voltage before the 50amp breaker in the subpanel one hot wire and neutral read 120v while the other hot wire and same neutral read only 25 volts. What could the issue be? I'm pretty sure there is nothing in between, just the wire running between the breakers. Does anyone have an idea about what the issue could be?

The wire is run underground. Direct bury I believe. No conduit. Been there about 20 years.

  • How is the wiring from the main panel to the subpanel run? Individual wires in conduit? Cable in a wall? A buried cable underground? – ThreePhaseEel Mar 28 at 0:55
  • Hello, and welcome to Home Improvement. You've created two separate accounts. Please use the SE contact form to request that they be merged. – Daniel Griscom Mar 28 at 2:12
  • Has there been any excavation activity on your property lately? – ThreePhaseEel Mar 28 at 2:18
  • No there has not – Chris Mar 28 at 2:25

You most likely have a bad connection of the breaker to the sub-panel bus bar or a loose terminal somewhere. It could POSSIBLY be a bad pole on the 50A breaker, but that's fairly rare in comparison. You MUST address this immediately by the way, because it's a fire waiting to happen.

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