New Shop Electrical layout

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Forum topic by Spitfire1 posted 06-05-2020 01:14 AM 1600 views 0 times favorited 35 replies Add to Favorites Watch
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68 posts in 2189 days

06-05-2020 01:14 AM

Topic tags/keywords: electrical layout new shop layout

Hi All,
I am in the process of building a new house with a new dedicated shop. This week I am going over the electrical layout for it. The shop space will be an oversized single car garage attached to the house. I am wondering what are some things to consider or keep in mind in the layout.

For starters I am thinking of adding at least two 220v circuits for table saw and dust collector. Aside from that and a number of regular plugs haven’t really got much else.

35 replies so far

View kajunkraft's profile


197 posts in 3660 days

#1 posted 06-05-2020 01:34 AM

Building your new shop is a lot of fun as well as a challenge. So far as the outlets it is a good idea I to plan out where your various machines will be. Therefore, the 120 & 240 outlets can be in the best locations. Grizzly has a shop layout program that is free and could be helpful for you. Also, I put the bottom of all my receptacles 50” up from the floor. This may be helpful if flooding is an issue for you but also means you can prop up a 4” sheet of material on the floor and not cover up an outlet. No matter how many outlets you think you need, put in more! Also try to label your breakers so you know which breaker is for which receptacle. Good luck.

View Fred Hargis's profile

Fred Hargis

7476 posts in 3944 days

#2 posted 06-05-2020 10:21 AM

I would put in more than 2-240V circuits, you may have more tools in the future as well as wanting to relocate the use points of the ones you do have. I would also put all receptacles 52” above the floor (so they don’t get blocked by things leaning against the wall) and you might want to consider using 2-gang boxes for the 120V outlets…even running 2 circuits to each so that each duplex is on a different breaker. That allows the use of to high-amp tools in each location. Lastly, have your lights on their own circuit, just in case you trip a breaker you can still have light. Enjoy!

-- Our village hasn't lost it's idiot, he was elected to congress.

View Redoak49's profile


5571 posts in 3439 days

#3 posted 06-05-2020 10:45 AM

I would have a subpanel out in the shop as it makes it easier to make electrical changes in the future.

I would put at least one 220 on every wall and wire them for 30 amps.

I would put at least two 110 on each wall

Wire the ceiling to have capability to add lights, fan, air filter, garage door opener and drop down plugs.

Plan for heat and air conditioning.

View DaveM123's profile


113 posts in 744 days

#4 posted 06-05-2020 11:32 AM

I agree with having a few 220 outlets. When I did my shop the only thing I had on 220 was my table saw. I put in one 220 outlet. Big mistake. I now have my dust collector and bandsaw on 220 so I have had to add outlets. Wish I had been thinking ahead!

-- Dave

View John Jardin's profile

John Jardin

103 posts in 1090 days

#5 posted 06-05-2020 11:51 AM

I agree with Redoak 49:

I would have a subpanel out in the shop as it makes it easier to make electrical changes in the future.

I would put at least one 220 on every wall and wire them for 30 amps.

I would put at least two 110 on each wall

Wire the ceiling to have capability to add lights, fan, air filter, garage door opener and drop down plugs.

Plan for heat and air conditioning.

View John Smith's profile

John Smith

3042 posts in 1613 days

#6 posted 06-05-2020 11:53 AM

all above are good suggestions.
the only thing I would add is a 220v near the big door for a “real” welder.
“just in case” you ever decide to get one.


-- I am a painter: that's what I do, I like to paint things. --

View becikeja's profile


1193 posts in 4263 days

#7 posted 06-05-2020 11:59 AM

I have incorporated contactors into my electrical system. I have a master switch at the front of the shop that can be locked out. The master switch then connects to 8 different circuits 5-120V and 2-240V circuits with multiple outlets on each. These circuits feed the power tools. Lights, radio, A/C etc…. are on separate circuits. By doing this I can prevent my grand kids from accidentally turning on any power tools if they happen to wonder in the shop without me. Maybe a bit overkill, but I would never forgive myself if something happened. I also had several contactors lying around so why not? If you’re starting from scratch it would be easy to incorporate and you will not regret it.

-- Don't outsmart your common sense

View Knockonit's profile


1226 posts in 1652 days

#8 posted 06-05-2020 11:59 AM

220 on all walls, especially near doors in event you decide to use a welder, yeah i know the 110 migs are great, but sometimes you need the big daddy to melt the metal.
at work counters, outlets should be about every 4 ft, with at least two circuits on counter top system, on working walls, where planers, drill presses, misc. sanders ect tools, i’d still do every four feet, easier to do it before closing walls, doesn’t mean you have to use them but cords strung all over the joint well, we know how well that works.
I have two coil cords in my garage, space haphazardly, just in event i move the big table, i hate stepping on cords so the drops are great.
buying the leds, you can get linkable units, with a 3-5 ft cord on them, i made mistake and hung way too many led lights, for a while had to issue sun glasses, till i re spaced and adjusted count of units, i like light but got the led scalp burn , lol.
outlets are cheap to put in, before the fact, i redid mine a few months back and made sure i had at least two circuits on each wall, in event i was running a couple power hungry units,
best imo to over kill the outlets rather than, “oh crap, i shoulda put one here.”
best of luck with new shop, anxious to see layout as time allows
rj in az
and yes subpanel, so much easier to have local breaker than a walk about to get to one

-- Living the dream

View JackDuren's profile


1853 posts in 2410 days

#9 posted 06-05-2020 12:45 PM

Wire aint cheap and you need dedicated 220 runs. Gotta be smart or willing to pay for the dedicated runs.

View controlfreak's profile


3701 posts in 1052 days

#10 posted 06-05-2020 01:18 PM

I did the 50” to the bottom of the 2 gang box which was a great idea I picked up here. I ran two circuits to each box and used an almond 20 AMP on the left circuit. I used a white on the right circuit. It give me a kind of mental reminder of what I am using on each circuit so if high amperage tool is on the left circuit I reflexively plug the next tool in the right. If I ever trip which hasn’t happened yet I can just move the load by moving a plug over.

View jonah's profile


2283 posts in 4749 days

#11 posted 06-05-2020 01:55 PM

A subpanel is a no-brainer. There’s no chance you never ever want to make any changes, so make changes as easy as possible.

Other than that, I’d go with at least three 240V circuits and obviously 120V everywhere.

View ibewjon's profile


2928 posts in 4243 days

#12 posted 06-05-2020 02:00 PM

I also put in a contactor for lockout, but mine is a 100 amp, so it feeds the whole tool panel. I also have a primary panel for lighting, heat, ac, cameras, and several receptacles controlled by an in wall timer to control battery chargers. If this is a shop, not a garage, add an in floor receptacle in the proper box for power to ts without a cord to trip on. Even a duct for dust collection near the receptacle. I like working without trip hazzards. Of course, all these suggestions cost money.

View Madmark2's profile


3414 posts in 2038 days

#13 posted 06-05-2020 02:18 PM

Plug mold over the bench

Wall outlets over 48” for sheet goods clearance.

Put in quad boxes instead of duals.

Put in 2x the lighting you think you need directly over tools and as low as possible. General lighting is overrated, TASK lighting is key. More is always better.

Use twist lock (L prefix) connectors on your 220v loads, well, just because.

NEMA 5 is 110v, NEMA 6 is 220v, digits after dash are max amps, add L for locking. So NEMA 5-15 is standard 110v/15a wall plug while NEMA L6-20 is the 220v/20a locking plug for your saw.

-- The hump with the stump and the pump!

View bondogaposis's profile


6182 posts in 3801 days

#14 posted 06-05-2020 02:31 PM

Make sure have the electrician put some outlets in the ceiling so you don’t have extension cords running across the floor.

-- Bondo Gaposis

View ibewjon's profile


2928 posts in 4243 days

#15 posted 06-05-2020 05:07 PM

Ceiling receptacles will require twist lock.

showing 1 through 15 of 35 replies

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