09:35AM | 11/23/05
Member Since: 11/13/05
1 lifetime posts
Just finished my 12x20 detached workshop which sits 25' from the corner of my house (on the opposite end from my elecrical box). Outside Electrical box is 75' as the crow flies. I want to be able to operate my table saws, drills, lights, etc. What size wire and Amps do i need to run to the box I'm installing in my shop. My saw is 20 amp as is most of my larger tools. You all know the normal loads i'm sure.

Any help would be greatly appreciated.

Thanks, RON.


09:51AM | 11/23/05
Member Since: 11/22/05
2 lifetime posts
add up the watts of all the tools you are going to use by multipling the amps x the volts to find out how many amps you need.

There's more to the formula.

You can ask or find it here

This is basically an electrical forum.

These guys answer quik.

They's lots of info there.

good luck to ya



Tom O

01:54PM | 11/23/05
Member Since: 09/17/02
487 lifetime posts

At a minimum, 60 amps.

If you'll send me your e-mail address, I'll send you a FAQ that deals with sub-panels in detached buildings. It covers wire sizes, burial depths, grounding, etc.


08:15AM | 11/24/05
Member Since: 04/25/05
1918 lifetime posts
That is the largest combination of equipment that will be operating at ONE TIME.

Typically that will be a table saw (plan for a 3 ph cabinet saw even if you don't have one now) and dust collector. Plus lights and heat/AC.

Typically that comes up to about 30 amps. A 50-60 amp feed will be fine in most case unless you are doing welding. Maybe some ceramic kilms require more power.

But get a 100-125 amp sub-panel. You can get ones with more slots.


06:58AM | 07/28/07
Member Since: 07/27/07
2 lifetime posts
depending on your incoming service size, i would install a 50 to 100 amp sub-panel. if you only have a 100 amp service, install a 50 amp sub-panel. if its a 200 amp service, install a 100 amp sub-panel. for wire sizes, you can't figure "as the crow flies." you have to figure total length of conduit. the rule of thumb is for over a hundred foot run, step up the size one gauge. for a hundred amp service, you'll need to run number 2 with a number 6 ground. and step it up a size if your run is over a hundred feet. oh, and chances are, you don't even have a 3 phase service if this is residential.


07:16AM | 07/28/07
Member Since: 04/25/05
1918 lifetime posts
First you did not indicate if the wire size is for copper or AL.

But table 310.15(b)(6) is limited to residential service laterals and feeders.

It can't be used for a sub-panel for a shop.


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