Anonymous
Anonymous asked in Home & GardenMaintenance & Repairs · 1 decade ago

question about main circuit breaker at my house?

The main circuit breaker on the side, at the outside out my house is overheating and pops. All electricity inside the house gets turned off when this hapens. It tends to happen whenever I use the AC on a hot day. The electrician says that this 90 AMP circuit breaker needs to be replaced. The problem is that he says that they don't make these 90 AMP circuit breakers anymore. They only have them in 100 AMP. He says it's safe to go up from 90 to 100 AMP.

Is this safe to do at my house? Your suggestions would be greatly appreciated.

Update:

I forgot to mention that this 90 amp circuit breaker is the main circuit breaker to the house. On the panel outside the house, there are 2 circuit breakers. One for the main, and one for the AC. The AC breaker is OK. Only the main 90 amp circuit breaker trips when I use the AC. The AC was tested, and the AC was not the root cause of this problem. The main circuit breaker was the problem.

Update 2:

So is it safe to upgrade my 90 amp circuit breaker to a 100 amp circuit breaker?

10 Answers

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  • 1 decade ago
    Favorite Answer

    It sounds like you are overloading the circuit.

    A circuit breaker trips when:

    To much current flows through it

    There is a short or ground fault

    Breaker is bad

    To find out if there is to much current flow, you need to test the main feeders with an ampmeter, preferably on a hot day with AC running.

    If your panel is pulling more than 90 amps, the main should trip. That is what it is supposed to do.

    If it is not pulling anywhere near 90 amps, the breaker is bad and needs to be replaced.

    You need to look at the panel and see what the bussing is rated at. It is probably rated at 100 or even 125 amps. If so, you can safely replace the main with a 100 A. Do not replace it with a 200 A breaker as one poster has said.

    You might think about upgrading to a 200 A panel. This will give you the capacity to add more circuits in the future.

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  • 1 decade ago

    Your main 90 amp breaker is probably weak...

    You should have the breaker replaced with a 100 amp.

    If it was your AC it would trip the breaker for the circuit that you AC is on..

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  • 4 years ago

    Turn all other circuits to off, then the main on and back off, make sure it's all the way off, wait a few minutes then try the main again. If it still will not stay on, then replace the breaker. If it does stay on, then slowly turn the rest on, one at a time, and if it blows again, then the circuit that blows the main has a problem.

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  • 1 decade ago

    Ask your power provider if they have the proper wiring for your upgrade.I would say they do is just a mater of asking them to make sure.If they say yes and only then your electrician could upgrade your breaker.U still have home work to do in order to find out if 100 Amps are OK for your house.U should get all your appliances watt usage and lighting add them all together and u will find out how many amps u going to need. Putting in a bigger breaker don't mean your system can take it.

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  • Anonymous
    1 decade ago

    If your breaker is closing all the time, means the system is being overloaded, a sparky should inform you of options besides upping the size of the breaker, we had an extra line put in, so that not so many items are running at the same time, sounds iffy in increasing the breaker, means something is overheating, maybe even melting b4 switching off, get another opinion

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  • 1 decade ago

    trust your electrician, let him install the 100 amp for now, but what you might consider in the future is to up grade your electrical service to 200amps, while your electrician is there get a quote. It should cost about $450 for the parts and $200 for labor, but then again he could already have the parts and be willing to cut you a deal

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  • Anonymous
    1 decade ago

    Your wire size going into the house from your disconnect outside is probably rated for 100A. They don't make wire rated for only 90A. I would assume your electrician is aware of wire rating.

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  • Anonymous
    1 decade ago

    yes you can put a 200 amp on there and it will work

    the amp is what it needs to work you can always use more no problem

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  • 1 decade ago

    Yes ,its the main and probably has just gotten weak.

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  • 1 decade ago

    as you have two more CBs, these CBs will take care of fault current less than 100A. so you can replace it by 100A

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