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The 20A breaker for my bedroom will trip whenever we have a power outage at my house. If you reset it, it will trip again after an interval, say 5~10 seconds. The longer you wait to reset it, the longer it will go before it trips. It generally takes 5-6 hours of waiting before you can reset it and and not have it trip again. What might be causing this? Could it actually be a wiring or electrical problem in my house or is it likely that the breaker is failing?

Things connected to the breaker:

  1. Two desk lamps
  2. One overhead lamp
  3. One fan
  4. Two desk clocks/alarm radios

Having the lights and fan off does not seem to impact this.

The last time this happened, we contacted our landlord to have an electrician come fix it when we could not get the breaker to stay on. An electrician came out the day after and found nothing wrong and it was working: very unhappy landlord.

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This only happens after a power outage? Does the breaker trip when the power goes out, or when it comes back on? If you turn the breaker off manually, can it easily be reset? Is this a standard breaker, or a Ground Fault Circuit Interrupter (GFCI) or Arc-fault Circuit Interrupter (AFCI) breaker? Does it take far less pressure to turn the breaker off manually than other breakers? What is the make and model of the breaker (A picture might help)? What is the make and model of the panel? –  Tester101 Apr 19 '13 at 11:01
    
@Tester101 power outage. I could turn it off and on myself without issue. GFCI breaker. Sorry, it bit the dust, I cant tell how hard it is to turn off now. –  Kortuk Jun 20 '13 at 17:30
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2 Answers

up vote 2 down vote accepted

Probably a bad breaker, but the symptoms are also consistent with a mild overload causing the breaker to heat up and trip over time, the longer you let the breaker cool before resetting, the longer it takes for it to heat up and trip again.

I'd leave it turned off until you've ruled out a short in the wiring or other overload condition causing it to trip - if it's a short somewhere, that short is causing a lot of heat somewhere in the walls or other inaccessible place.

It's possible that the wiring is not straightforward and there's a load connected to the breaker that you're not aware of - like maybe the toaster in the kitchen is on the same circuit so be aware of what other appliances in the house may be in use when you experience the trip.

The hard thing about finding a short circuit is that if it's due to, say, a bad connection in a junction box under the floor, it may not short out until you walk near it and make the wires flex enough to touch. If you notice any kind of burning smell associated with the trip, keep the breaker turned off until someone finds the problem.

Some types of breakers are subject to "nuisance tripping" even without any overload or wiring problems - if you have an AFCI or GFCI breaker, you could be experiencing nuisance trips due to a device that's plugged in.

If you have 20A service to your bedroom, you're probably in a newer house (15A is more typical, especially in older construction), so a short is less likely than if you're in an older house so the most likely cause of the problem is a bad breaker. Hopefully the landlord had his electrician swap out the breaker since a breaker is relatively cheap compared to having the electrician make another service call.

The consequences of a short somewhere are severe enough (i.e. a fire in the walls or other inaccessible area) that it's worth ruling out a short before you leave the circuit turned on. If the landlord can't fix it to your satisfaction, hire an electrician of your own and bill it back to the landlord. Even if it's just a bad breaker, the landlord is responsible for wiring problems.

The fact that it stays on after waiting 5-6 hours probably means that it's not a short, but I wouldn't dismiss any repeated circuit breaker trips since the circuit breaker is your only warning about a dangerous short in the wiring.

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You talk a lot about "ruling out" a short circuit, how would one go about doing this? –  Tester101 Apr 19 '13 at 11:05
    
Herrbag answered that part in his answer -- use an ammeter from the breaker box to see how much load is on the circuit. If there's more load than what you've put on the circuit, there's a short somewhere. And his suggestion to verify the wire gauge is a good one too. –  Johnny Apr 19 '13 at 14:40
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The circuit is either (nearly) overloaded or the breaker is defective.

An ammeter check of the circuit in question is the best way to verify an overload. This is not a recommended DIY test because the breaker box has to be opened and the ammeter put in series with the breaker.

Your list of devices wouldn't normally be close to using 20A, unless a device was faulty.

The electrician could have done the test I described. If the load is normal, replacing the breaker is in order.

Update: To be thorough, the wire gauge of the circuit should be verified (it should be 12 gauge for 20A, 14ga for 15A), as well as doing the load testing... Perhaps this circuit has been a problem before and someone increased the breaker to 20A (from 15A) to eliminate nuisance tripping. Overloaded breakers are not good, overloaded wiring is dangerous.

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