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Question DetailsAsked on 6/13/2013

how much should upgrading home electric to 200 amps from 100 amps?

current system works fine for air conditioning, heating, stove, dryer, etc. I want to hook up an 80 amp device in my basement shop and I don't have enough amps currently available.

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1 Answer


Here are a couple of basically identical and related recent questions and related answers:

Note that a single 80A device is too large a load for most breaker boxes - most are rated for 30A or 50A maximum per breaker, so you will probably need a separate feed from the outside master breaker box to a new auxiliary panel serving only that one device, which would probably be cheaper than trying to pull an 80A wire (looks like 6 ga is borderline, so probably 4 ga) into an existing multi-breaker box anyway.

Also, an 80A load would provide quite an expensive mess in your existing box if it ever overheated or shorted out - so I would really recommend a separate breaker box for it, with the shortest possible run from the master panel. Remember to really upsize the wiring, and have the electrician remember temperature derating and cable type if being run in conduit, as for a welder circuit (my guess as to what this is for) being pulled to the front of the garage or workshop so you can easily weld either indoors or outdoors.

Answered 7 years ago by LCD

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