Power in my shop
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    DaubsNU1's Avatar
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    Power in my shop

    New to me acreage with 30'x40' shop (Lester building), no power currently...getting ready to run 100 amp service when ground thaws.

    Shop will be used to for woodworking and automotive work. Biggest power draws currently will be Campbell Hausfeld Pro-180 mig welder, 240v 60 gallon air compressor, old-school table saw. May add plasma cutter and heater down road.

    At previous house I had electrician run 240v line to garage. I pulled that breaker box from old house and plan to use in the shop.

    Air Compressor: Box already set up with 20A/240v circuit breaker. Compressor will be ~30 feet from the box, by my calculations I should be able to use copper 12AWG, correct?
    2015 John Deere x750, 60" HC Deck
    1979 Lawn-Boy 7268 ("Frank")
    2007 Lawn-Boy 10797 ("Sally")

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    RodW's Avatar
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    Quote Originally Posted by DaubsNU1 View Post
    Air Compressor: Box already set up with 20A/240v circuit breaker. Compressor will be ~30 feet from the box, by my calculations I should be able to use copper 12AWG, correct?
    12 AWG should be fine at that distance (be sure to include both vertical and horizontal runs in your total length measurements.). Here's a decent calculator:

    Voltage Drop Calculator

    "utilizing a #12 Copper conductor will limit the voltage drop to 0.87% or less when supplying 20.0 amps for 30 feet on a 240 volt system."

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    Senior GTT Super Slacker Gizmo2's Avatar
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    Maybe I missed it but what is the current draw on the compressor?
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    DaubsNU1's Avatar
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    Quote Originally Posted by Gizmo2 View Post
    Maybe I missed it but what is the current draw on the compressor?
    Thanks RodW.

    Gizmo2: not sure on current draw from compressor. The 20A/240v circuit worked in previous house.

    Welder: Box already set up with 20A/240v circuit breaker. Want to put 240v outlets on east and west side of the shop. East side will be 15' from box, then will run line up wall, across truss, then back down wall to west side of shop, another 40' of wire (~55' total). Calculator calling for copper 10AWG(?). Can I run 10/3 to junction box, branch off to first outlet with pigtail, then run remainder over shop to west side? Note: Will only be using one outlet at a time.
    2015 John Deere x750, 60" HC Deck
    1979 Lawn-Boy 7268 ("Frank")
    2007 Lawn-Boy 10797 ("Sally")

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    pappa's Avatar
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    Quote Originally Posted by Gizmo2 View Post
    Maybe I missed it but what is the current draw on the compressor?
    I maybe stupid but why do you need to know the start up and running load in amps? Just use the 20 amp breaker and #12 wire and if the breaker trips or the wire melts you go bigger or buy a new compressor! DAH!
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    Quote Originally Posted by pappa View Post
    I maybe stupid but why do you need to know the start up and running load in amps? Just use the 20 amp breaker and #12 wire and if the breaker trips or the wire melts you go bigger or buy a new compressor! DAH!
    Hopefully they make an equivalent to this for building wiring:

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    Quote Originally Posted by DaubsNU1 View Post
    Can I run 10/3 to junction box, branch off to first outlet with pigtail, then run remainder over shop to west side? Note: Will only be using one outlet at a time.
    Oops, I guess you can.
    Last edited by Roger47; 02-20-2019 at 11:28 AM.
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Go with 10AWG and donít look back. The breaker is to protect the wiring, not the device. The breaker has to be sized correctly due to the wiring. 14AWG uses 15a on 120, 12AWG uses 20a on 120, so on and so forth.

    So if you need to use 20a on 240, you can go 12AWG and still be fine as long as your run is short enough to be appropriate. 10AWG would be better and you can still legitimately use a 20a breaker. You can always go larger wire size for the breaker size, but not the other way around.

    10AWG isnít that much more expensive and allows a fudge factor and for future upgrades.
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Quote Originally Posted by Roger47 View Post
    I don't think so if you want it to be NEC compliant.
    No, itís fine. He can run many outlets on the one circuit. The breaker is to protect the wiring, not the devices. If he runs more than the breaker can handle, it trips. It wonít overheat the wiring and potentially cause a fire.

    There may be a limitation on how many outlets on a circuit, but heís not going to exceed it in this case.
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    2720 w/ 200CX FEL
    , Ken's weld-on hooks, Fit Rite Hydraulics Top and Tilt kit, Artillian forks.
    1954 60 - getting full restoration, 1964
    110 round fender in the shop for crustoration
    Ferris IS3200Zzero turn mower

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    DaubsNU1's Avatar
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    Quote Originally Posted by Roger47 View Post
    I don't think so if you want it to be NEC compliant.
    Country life, so no inspections needed. But safety is #1 concern...I don't want to burn down the shop.

    Would I need to run a separate 240v line to other side of the shop, and have it on it's own breaker?
    2015 John Deere x750, 60" HC Deck
    1979 Lawn-Boy 7268 ("Frank")
    2007 Lawn-Boy 10797 ("Sally")

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