How much power does your shop draw?

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Forum topic by Madmark2 posted 02-10-2019 09:34 PM 952 views 0 times favorited 16 replies Add to Favorites Watch
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1826 posts in 1506 days

02-10-2019 09:34 PM

Topic tags/keywords: power shop max load outlets 220 110 question bandsaw planer scroll saw biscuit joiner drill press router spray gun blade jointer sander tablesaw ros dc lighting modern

Our shop is pretty well equipped. We have two 220v loads, the 60 gal air compressor and the big hybrid TS. We have a 3-1/2 hp Milwaukee Heavy Duty router, two band saws (12” & a broken 9”), OSS, scroll saw, model making TS, thinness sander, lunch box planer, two drill presses, 4×36 belt sander, 1×42 knife sander, 2 ros’s and a 1hp DC. This plus assorted lighting (all LED) and other small power tools, drills, circ saw, etc.

Our total outlets
Lighting on its own circuit

All of the 110v tools are run from a single 15a circuit on the back wall of the garage. There is a quad box from that which feeds the benches and fixed machines. We have a single 220v 20a circuit that is switched between the two big load so that both can never come on together.

We rarely trip the breaker when even at max load planing with the DC running for extended periods of time. No other permutation has tripped the lone 15a breaker even with three of us working at once.

Arrrr, what’s in you panel?

-- The hump with the stump and the pump!

16 replies so far

View ibewjon's profile


2147 posts in 3711 days

#1 posted 02-10-2019 10:20 PM

I brought a full 100 amp, 240 volt feed to my shop, but I am an electrician. I work alone, and the most I could ever use is 5 HP for tools, plus a 5 HP if the air compressor kicked on. Plus I do have a heat pump / ac. How many tools can you run at once? Do you work alone or is this a business? I have a neighbor who was bragging to me that he had 30 receptacles in his shop, each on a separate circuit. Since he also works alone, he wasted a lot of breakers and wire. Sounds like you are just getting by, but of course more is always better.

View Madmark2's profile


1826 posts in 1506 days

#2 posted 02-10-2019 10:39 PM

three small scale operations not selling lots but staying busy. boxes and pipes mostly. no hvac – shop is 1/2 of two car garage. we’re effectively running off one outlet for 110v and a 2nd for the 220v loads without issue.

as an electrician what is your opinion of us using a DPDT sustained center off 20a 220v switch to feed the saw and compressor alternatively?


-- The hump with the stump and the pump!

View ibewjon's profile


2147 posts in 3711 days

#3 posted 02-10-2019 11:26 PM

Probably a good thing. With that switch, the other tool can not start and trip breaker.

View klassenl's profile


207 posts in 3577 days

#4 posted 02-11-2019 02:46 AM

My shop panel is currently fused at 30amps. No problems even with 5kw of heat. But I am only a 1 man shop.

-- When questioned about using glue on a garbage bin I responded, "Wood working is about good technique and lots of glue........I have the glue part down."

View Jared_S's profile


407 posts in 877 days

#5 posted 02-11-2019 03:11 AM

Small one man setup

240v list
Bandsaw 5hp (22A)
Shaper #1 3hp (15A)
Shaper #2 5hp (25A) + power feed 1/2 hp (2.5A)
Shaper #3 5.5hp 13.7A 3 phase + feeder 1hp (4.7A)
Tenoner 3hp 8.7A 3 phase
Mortiser 2hp 6.7A 3 phase
Table saw 2hp 11A
Planer 2hp 11A
Moulder #1 2hp 11A
Moulder #2 2hp 11A
Air compressor 5hp 20A

Im not going to add that total amperage up, but im running it all off two 30amp lines.

View mike02719's profile


267 posts in 4704 days

#6 posted 02-11-2019 04:39 AM

I ran a three conductor #8 uf cable underground from my shop to the house. My future consideration was to install three 1” plastic conduits. just in case. In the house I used the 220v range breaker to power the shop. Since then I have used the remaining conduits for TV, telephone, intercom, etc. For receptacles, every six feet or at least three on each wall. I put a 110v and a 220v on either side of the wall stud. For my table saw, I ran both under the floor to a covered trap .This has worked well for me (one man shop) for the last 20 years. I only run the lathe, TS, drill press, on 220v. The best thing I did during this was to buy a circuit breaker panel for the shop. All my equipment is right there in the shop for potential problems. Works for me. Good Luck.

PS I am the luckiest man in the world. We have the Red Sox, Patroits, Celtics, and Bruins winning so often.

-- Mike, Massachusetts

View Charlie H.'s profile

Charlie H.

405 posts in 1568 days

#7 posted 02-11-2019 03:40 PM

60A subpanel, 2 circuits 220v 20A, 4 circuits 120v 20A
One worker shop, biggest power draw is from these machines.
220v dust collector 14A (can run simultaneously with other machines dedicated circuit)
220v table saw 13A
120v portable AC / heater 15A maximum (pretty much runs full time when I am in the shop dedicated circuit )
120v various machines 15A maximum
120v shop vac 10A (can run simultaneously with other machines)

-- Regards, Charlie in Rowlett, TX --------I talk to myself, because sometimes I need expert advice.---------

View WhyMe's profile


1322 posts in 2479 days

#8 posted 02-11-2019 06:38 PM

60A subpanel, 2 circuits 220v 20A, 4 circuits 120v 20A

- Charlie H.

So.. how did you get the 120V circuits if the total feed is 220V? :)

View Mainboom's profile


92 posts in 675 days

#9 posted 02-11-2019 06:56 PM

. I have a 125 main lug with 7 110v breakers. 1 240v breaker.i run a 25000 watt 240v heater. If I have that running with my dust collector. And turn my table saw on I will throw a breaker. This is because my table saw draws alot if amps.i have it set up for 110v not 240v this is because of the heater. So I have to turn table saw on then dust collector if i dont wanna unplug my heater. Other then that I can run what I want. Once I upgrade my service to the house I don’t think this will happen anymore.i actually only found this out this weekend.
My wife is a union electrician and does my panel work for me mostly.i was told I couldn’t have another 240v till we upgraded service and I have to deal with it because heater draw so many amps and so does a table saw at startup. Otherwise it’s all good it’s better then the 100ft extention cord in was using

-- CRANE OPERATORS START EARLY because iron workers need their heros ready when they wake up

View rockusaf's profile


181 posts in 1020 days

#10 posted 02-11-2019 07:51 PM

I have a company coming out next week to run a new 100amp breaker panel from the house out to what will be my 12×24 shop. There are currently 16 outlets and an overhead light all connected together and for the life of me I can’t figure out how the previous owner got power to it. The light was on when we came to look at the house but nothing works now and i pulled down the pegboard covering the walls and it looks like the wire just daisy chains from outlet to outlet and I don’t see where anything comes into the shed. They are going to split everything up into a circuit for lights and separate the outlets into 4 circuits and add a 220v circuit for later use. They are also going to run power from that panel to the other shed that has power now but it is from an overhead romex line from the shed to the house that is a little scary. Wire looped around a hook on the house and shed to put tension on it so it doesn’t sag does not inspire confidence that any of it is up to code.


-- Measure Once Cuss Twice

View panzer's profile


7 posts in 1277 days

#11 posted 02-13-2019 08:15 PM

My shop is 14×28 and I have a 100A 220v service. The amount of circuits I have is probably overkill but I’m an electrician and I don’t believe you can ever really have too much power.

Lighting is on it’s own circuit, that way if a tool trips a breaker I’m not standing in the dark with blade coasting to a stop.

There are 4 general use 20A receptacle circuits, 2 on each side of the shop. Receptacles are spaced 6ft apart and alternate so no 2 are side by side and on the same breaker. This allows me to plug in a shop vac, tools, lights, etc. near each other without tripping a breaker or having to stretch an extension cord. This was an issue in my old shop. One of these circuits also feeds a GFCI on the outside near the door

I have separate dedicated 110v 20A circuits for both the compressor and a window A/C unit.

The table saw, bandsaw and jointer share the same 220v 20A circuit. This is fine because I’m a one man shop and never run more than one machine at a time.

I need to add a 220v 50A circuit for a welder and if I ever get a real DC I will add a dedicated circuit for it also.

View ibewjon's profile


2147 posts in 3711 days

#12 posted 02-13-2019 09:59 PM

Glad to see another shop ‘overkilled’ like mine. I also installed three stop start stations for my dust collector, one next to the lathe. I also plan to add current switches on TS, shaper, planer and other tools wired back to the DC starter for auto dust collection when these machines are turned on. Good job on your overkill!!

View Manitario's profile


2816 posts in 3801 days

#13 posted 02-14-2019 04:24 AM

I have a 200amp panel in my shop. I have 3×30amp 240V circuits for planer/jointer and dust collector, 3×20amp breakers for the extensive lighting and all the wall plugs are 120V, 20amp. Heating is a pellet stove and in-floor propane fired radiant heat so not much power needed for that. I imagine that worst case scenario with all the lights on and if I was to fire up the DC and planer at the same time, I’d draw just over 80 amps.

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

View Charlie H.'s profile

Charlie H.

405 posts in 1568 days

#14 posted 02-14-2019 04:33 AM

60A subpanel, 2 circuits 220v 20A, 4 circuits 120v 20A
- Charlie H.
So.. how did you get the 120V circuits if the total feed is 220V? :)
- WhyMe

Nitpicking must be fun.

-- Regards, Charlie in Rowlett, TX --------I talk to myself, because sometimes I need expert advice.---------

View Phil32's profile


1181 posts in 821 days

#15 posted 02-14-2019 04:58 AM

As a woodcarver, all my tools are hand tools. No power. I never trip a circuit breaker. I work at the dining table.

-- Phil Allin - There are mountain climbers and people who talk about climbing mountains. The climbers have "selfies" at the summit!

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