Question about Electrical Supplies
The breaker will trip after about 5 minutes of running time
Breakers trip because of heat.
When heat from wire exceeds breaker rating, it trips.
Something is causing heat on the wire, wire is too small for the amp draw, there is short circuit, or breaker is bad.
Replace breaker and/or test wire.
Put amp-meter on wire and read amp draw through wire.
Amps cause heat. That's why high voltage lines from power station are high-volt-low-amp so there is no heat loss with long distance transmission, until transformer at home converts electricity to lower volts and high working amps with enough power to run electrical devices.
Same is true for AC and DC circuits.
If amp reading on wire exceeds rating on breaker for length of time, then breaker will trip.
The fact that the breaker lets current (amps) to flow for a period of time before tripping is because the breaker is probably rated for slow-acting, or it takes a while for amp draw to heat the wire.
Following image shows amp-meter that clips over wire to get amp reading.
Posted on Nov 01, 2012
If it takes 5 minutes to trip, I would rule out a short. I agree with Gene, Change the breaker. If that doesn't work, check your wires and calculate the amp rating of the breaker with what is being used on that circuit. Formula: Voltage X Amperage = Wattage.
Posted on Mar 05, 2016
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Posted on Jan 02, 2017
The most likely causes in their order of probability are: 1) water somewhere in the circuit causing the hot wire to ground; 2) a legitimate trip caused by a defect in a device plugged into the circuit; and 3) a defective GFCI breaker. In the first case, wait until it has been dry for about a week and see if it trips. In the second case, make sure there is nothing plugged into the circuit and try resetting. In the third case go ahead and put the regular breaker in, then put a GFCI outlet into the first box downstream from the breaker. If installed according to the directions, that outlet should protect all of the outlets downstream.
Posted on Feb 27, 2009
SOURCE: gfci breaker for spa
gfci's are designed to trip if they receive voltage on there ground/neutral side, therefore my vote is for Smithbrother I would say there is probably a partial short somewhere in you system.
Posted on Mar 24, 2009
check ot see if its on a shunt trip system. what it means is that in order to reset the breaker you have to see what made it trip. Look for a 115 volt breaker that is tripped in the panel that serves tha line. good luck.
Posted on Jan 25, 2009
It's possible that the first breaker that you said does not trip - it could be that breaker is failing to trip on a bad circuit. That is, it could be you have a bad circuit but that first breaker is not detecting it and pretends everything is OK. If your new breaker trips on the first breaker's circuit, the curcuit it probably bad and the breaker in not working properly. The most common problem for failed circuits is a stray ground wire in a box somewhere in the curcuit resting against a hot or neutral wire. You'll have to take apart every connection on that curcuit to find it. Not fun.
Posted on Jun 27, 2009
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