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Wiring subpanel for garage shop and dryer

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Topic by BrownsFan posted 10-17-2012 09:10 PM 88461 views 1 time favorited 55 replies Add to Favorites Watch
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BrownsFan

10 posts in 2534 days

10-17-2012 09:10 PM

Purchased new home with gas for the laundry.

I need to install electric for the dryer and while I’m at it, I might as well wire for my 220v 20amp Unisaw in the garage.

House has 200 amp service to the main panel. I have approximately 65ft between main and subpanel.

What gauge wiring do I want between panels?

It will be about a 6ft run from the sub to the dryer…..gauge???

It will be about 15ft from the sub to the Unisaw…. gauge???

I don’t have any other 220 tools in the shop. Of course I want a little expansion, but I don’t wanna go nuts the garage already has electric for the smaller tools. What amp subpanel do you recommend? ... and wire gauges?



View J's profile

J

70 posts in 2347 days

10-21-2012 11:37 PM

75C aluminum #2/0 is rated to 135A—You should not go above 125A on 2/0.
I have been in your shoes with this issue before; 2 pole breakers cut your panel capacity in half, so get a larger panel with more breaker spaces than you think you need. If a panel says “12 spaces 24 circuits” then it will only have room for 6 -2 pole breakers; 24 circuits can be made by using tandem breakers and are for 120v only.

In your situation I would put in a 100A sub-panel.

You can buy a 100A SquareD sub panel with main breaker built in (so the lugs in your main panel need a space to connect the feed wires that go to the sub) for about $50 from Home Depot. The 2/0 wire will have no trouble fitting into smaller amperage breakers either.

As far as amperage ratings go for your dryer/tools

a dryer should be on a 30Amp circuit;
your table saw likely only needs 12-2 run to the plug

12g romex = 20Amps
10g romex = 30Amps
8g romex = 40Amps
romex is the same as NM-B

Don’t forget that the feed to the sub-panel includes 4 wires: 2 hot wires, 1 neutral(marked white at each end) and a ground,

Use
2/0 Aluminum for the hot legs
1/0 Aluminum for the neutral leg #4 copper or #2 aluminum for your ground wire

Sub-panels must have the neutrals and grounds completely separated, with the neutral bus isolated from (not bonded to) the steel enclosure of the sub-panel.

-- I found the board stretcher... finally!

View burley's profile

burley

2 posts in 2242 days

10-27-2012 08:44 PM

J
You must have some electrical backround to make these suggestions however, if I could add a few pointers. Your sub panel must have a disconnecting means and you can not put two wire under a terminal that is designed for one wire. You must provide a terminal designed for two wires. I hope you find this information useful.

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J

70 posts in 2347 days

10-28-2012 12:08 AM

Thanks Burley;
the information I offered was by no means a complete description of the NEC, or residential wiring. I should also add this to my initial post that the service disconnect can be the “main” breaker that often comes included with many electrical panels, and is often cheaper than buying the parts separately, or it can be a breaker that is installed in the remaining spaces of the main panel.

I prefer to have the shut off within sight of the panel that power feeds. It doesn’t matter which panel has the shut off. If the main panel is not in sight and there is space on the hot legs in the main panel then I will use a panel with an included main as my disconnect.

As per the NEC:
Each service disconnecting means must be permanently marked to identify it as part of the service disconnecting means. When a building or structure has multiple services and/or feeders, a plaque is required at each service or feeder disconnect location to show the location of the other service or feeder disconnect locations. See 230.2

I also did not state that one could hook two hots to the same single pole breaker, I said that many panels have packaging labeled “12/24” indicating 12 slots and 24 circuits – This is misleading labeling because you could only have 24 – 120V circuits if you used tandem breakers. I do not recommend tandem breakers because they are expensive and many electricians that I know believe they are dangerous because they get hot. The additional wires in an enclosure also become cluttered and there are a maximum number of wires that can be in an enclosure. To be clear – 240v uses two hot wires and a two pole breaker.

Again, this is by no means a complete list of everything involved in adding a sub-panel. Your municipality may have requirements that supersede the NEC. A top notch hardware store in your specefic area will help you to determine any additional aspects of your job (like metal or pvc conduit for example).

-- I found the board stretcher... finally!

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dbray45

158 posts in 1706 days

01-26-2015 01:28 PM

I am not so sure about that Bill – I bought my house new (in Maryland) and it took 10 years to find all of the problems and correct them. The only saving grace was that I didn’t have additional things messed up in the walls from other people.

-- Love woodworking and fixing most anything

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dbray45

158 posts in 1706 days

01-27-2015 02:23 PM

Bill – does everything have to be a marketing position for you? The point of sites like this is to change things to something that we (or our customers’) need or want and either ask questions on how to do something or show off what we have done, not to find a contractor to do it. If you put together a blog and make a list of all the contractors and sub contractors you have on you lists, the folks here can use it for a reference – that would be good. As far as I am concerned – the only place that the word “should” is required is where electric, plumbing, and permits come to play.

Most people have a pretty good idea what a garage is used for. For me, my garage will not see a car or a washer/dryer, it will be my shop. The cabinets that I put into it will be made by me – not garage appeal.

Sorry, not normally like this but after seeing a whole lot of posts from you and all of them are sales pitches, it got old. Let’s talk shop—Brown’s fan—- great job so far

-- Love woodworking and fixing most anything

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