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What To Do When The Main Circuit Breaker Trips Off

How to Identify an Electrical Problem: Tripping Main Circuit Breaker or Blown Fuse, What to do About a Home Electrical Problem.

Tripping Main Circuit Breaker
Electrical Question: The main switch in the fuse box has shut off three times, what could cause this?

This home electrical question came from: Kandi, a Homeowner from Houston, Texas.

Dave’s Reply:
Thanks for your electric wiring question Kandi.

Troubleshooting the Cause of a Tripping Main Circuit Breaker

Application: Electrical Troubleshooting, Testing Electrical Circuit Wiring.
Skill Level: Intermediate to Advanced. This electrical wiring project is best performed by a Licensed Electrical Contractor.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester or Continuity Tester.
Estimated Time: Depends on experience and level of problem solving skills.
Precaution: Testing live wires is dangerous and should be done by an experienced individual only. Testing using a continuity tester should only be made after the circuit has been identified and turned OFF and Tagged.

Tripped Main Breakers and Electrical Circuit Problems

What to do about a Electrical Circuit Problem

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NEC Codes for Home Electrical Wiring
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FAQs Frequently Asked Questions and Comments

One Response to “What To Do When The Main Circuit Breaker Trips Off”
  1. Forrest Brown says:

    My main panel 240V, 100A Seimans breaker would periodically trip off at very odd intervals. None of the normal trouble-shooting techniques worked. The problem was eventually traced to a combination of when the outdoor temperature was in excess of 95F and running the A/C unit or the Clothes Dryer. (The House built in 1985). Thermal trip units are supposed to be compensated for ambient temperatures, but it turns out that the Main breaker was sort of getting tired on hot days (so do I, come to think of it). Problem solved by replacement.

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