New Subpanel

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Forum topic by Kevin posted 12-13-2010 05:05 AM 1156 views 0 times favorited 4 replies Add to Favorites Watch
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462 posts in 3173 days

12-13-2010 05:05 AM

Topic tags/keywords: sub panel electric circuit breaker 240v 110 240 110v

I’ll be slapping in my last 20a 220v dp tomorrow in my sub panel. It’s rated at 100a I believe. Problem is that it only has 8 slots and 6 of the slots will be 240’s. I have two 110’s for my lights and smaller stuff. I can already see that I need a 240v for a dust collector soon and some more 110’s when I add onto my garage in the spring.

How should I approach this? Get a new subpanel to replace my current one with a larger amp rating or get another sub panel when I build on? I’m sure i’ll have to replace the current cb from the main box and possibly the wires. They are good size for sure, but nothing like my 1/0g wire I have ran for my audio systems.


-- Williamsburg, KY

4 replies so far

View Manitario's profile


2629 posts in 2851 days

#1 posted 12-13-2010 06:58 AM

I’d replace the subpanel with a larger one; put it in now as you’re going through the work and hassle of rewiring, rather than regretting it later, or having to rewire once you have all your machines hooked up. I can’t imagine you needing a subpanel with a larger amperage rating, unless you plan to use all your tools at once, but get enough slots so that you can accommodate your current needs and anything you may add in the future.
BTW I’m super jealous that you can put in a 100a sub panel: my house has only a 100a service so when I have my TS, DC and my 30a heater on my wife can’t use the oven…

-- Sometimes the creative process requires foul language. -- Charles Neil

View Kevin's profile


462 posts in 3173 days

#2 posted 12-13-2010 08:24 AM

True, I think that a sub panel with more slots is really what I need. In the summertime the air conditioner(220) and TS/DC would be all that is running at a time, plus the shop lights. Yes, 100a is probably plenty I would imagine.

Wow, sometimes you don’t realize how lucky you are until someone points it out. That’s gotta be rough in the winter time Rob :(


-- Williamsburg, KY

View Gregn's profile


1642 posts in 2951 days

#3 posted 12-13-2010 12:22 PM

I agree with the larger sub panel as well to allow you to dedicate circuits and save you a lot of headache later.

-- I don't make mistakes, I have great learning lessons, Greg

View Eagle1's profile


2066 posts in 3032 days

#4 posted 12-13-2010 02:58 PM

I would put a bigger panel in now than later. It gives you room to grow. I’m in the process of adding 2 more 220’s in. I needed a bigger subpanel. I went to the local electral store here in town. The lady there is quite informative. She didn’t have the panel we were talking about. but she did have a full panel with 100 amp breakers. She sold it to me with 2 30amp breakers. I think it has 18 or 20 poles in it. She sold it to me for $100.00. My cousion said that was a good idea, he’s a contractor. He is going to wire it for me, like he did the sub that I have now. The only thing he told me that I thought it was a great idea. He knows I want to build a seperate building for my shop. He said when you do just pull the new box off from the otherone, move it to the new building. But he did say if you decide to move remove it before you start to sell the house.

-- Tim, Missouri ....Inside every older person is a younger person wondering what the heck happened

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