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Question DetailsAsked on 7/30/2013

How can I determine if my electrical panel box is a 100 amp or a 200 am?

I want to have my homes electrical panel (circuit breaker box) replaced. You have big deals listed on your site that show 2 prices: 1 of 100 amp boxes and 1 for 200 amp boxes. How can I determine if panel is 100 amp or 200 amp?

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3 Answers


Open the panel door and look at the "main Breaker" size at the top of the panel. There are some older breaker panels that do not have a main breaker, but most do.

If it's really old, check the main fuse size at the top.


Answered 7 years ago by BayAreaAC


I wrote up a story in April about replacing circuit breaker boxes. I hope you find this helpful.


Answered 7 years ago by HughV


The panel should have it marked - either stamped in the metal facing inside the panel, or inside the door - stamped or on a rating sheet. You should NOT have to pull any cover pieces off to find this.

I would question why you are looking at a big deal if you don't know what your panel size is ? Also, the big deal may be for a box upgrade, but that does not mean your service and the outside main breaker are rated for that - makes sure if it is for a panel box upgrade, that the full service and main breaker are included in the deal or you will still be stuck with 100A capacity.

You should be working the other way around - figure out what capacity box you need for whatever circuits you want to add, THEN add up to see what size box and service you need.

Answered 7 years ago by LCD

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