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Old 02-23-2009, 02:55 PM   #1
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Dual Main Breakers

I have an older home in the serria mountians. I just found out that I cannot get insurance without replacing the fuse box with a breaker box. I have a main breaker box with one 220 main breaker for 100 Amps. The feed from that goes to a indoor fuse panel I need to replace. I found a simple one at Lowes but it too has a 100 Amp main breaker. The cost of 60 or 70 main breaker is, unfortuneatly, really high. Can I series two 100 Amp breakers, and stay within califorina codes?

I saw from other chats that adding a sub panel with a 100 amp main breaker to a 60 amp circuit seem to be ok. The 100 amp breaker acts as just a cut-off switch. But what happens if the both the main and subpanel breakers are the same current rating? My main breaker was added years ago, when I need to upgrade my service entrence to code. Previously the main feed went directly to my indoor fuse panel. So, consequently, there is only one circuit in the exterior box feeding the fuse box. The wires between the two boxes was also upgraded at that time to support 100 Amps.


Last edited by dcwestcott; 02-23-2009 at 03:19 PM. Reason: giving a better explaination of my situation
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Old 02-23-2009, 03:02 PM   #2
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i don't think so, but then again, i'm usually wrong about such things....
i might not be understanding exactly what you have in mind.


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Old 02-23-2009, 03:11 PM   #3
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Sure you can. You could put a 200 amp inside if you wanted as long as the feeder wire is protected by the 100 outside.
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Old 02-23-2009, 07:26 PM   #4
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Yes. And you need to have a 4-wire cable going inside.
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