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I have a 21b20m 20kw electric furnace when weather is cold the 100 amp breaker trips two or three times a day can you help please

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If you have a heat pump you usually have 1st & 2nd stage emergency heat . Your 2nd set of elements may be bad. You can test this with a meter by ohming across each element and it should read a ohm value. Then ohm from the element to ground and it should read OL if it does not it is shorted. Also 100 amp breakers for some reason always fail I have changed more 100 a breakers than any other size. You can also get an amp probe and turn your thermostat up and read the amp draw to see if it is close to 100a. Hope this helps

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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kcmetal9901
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SOURCE: 3 combination arc fault breakers tripping under load

What is happening is the white wire that comes off the breaker is probably too close to another neutral or too close to a hot wire that is on one of the other circuits that will make it trip when you use a drill etc... Check to see if the coiled up white wire off of the breaker is not near a hot in the panel. I have had lots of arc fault breakers trip for that reason.

Posted on Nov 28, 2008

freetek
  • 5568 Answers

SOURCE: 15 amp Gould breaker trips every 24 to 48 hours

As seemingly with everything else, these devices were once very reliable but now fail early in life.
Assuming that this is no GFI (Ground Fault Interrupter) equipped breaker, you must  have a bad one. If it is, you may have some stray currents tripping the breaker.
While finishing up on our new home and putting breakers in the main box for the first time, one brand new breaker refused to stay set even though the circuit was OK and no loads on that branch connected at all. In the two years we have been here, we had to replace a second one acting just as you describe.

Posted on Dec 15, 2008

muttandjeff
  • 359 Answers

SOURCE: electric furnace wire heating up

you should have a 3- conductor # 6-3 copper wire running to this 60 amp breaker @ the furnace to the panel if this is not the case you should replace this with a # 6 as of now as it is a fire hazard as it is and needs to be fixed at once , # 10 -2 wire is only good for 30 amps and a 60 amp breaker will not trip under fault condition and you could have a fire , if you need further assistance on this let me know and i will try to help

Posted on Jan 10, 2009

  • 653 Answers

SOURCE: Ground Fault circuit Breaker trips each time a load is applied

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

  • 132 Answers

SOURCE: two 15 amp arc fault breakers installed on two

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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