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
477 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
1915 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
1915 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.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

The “Briolette” faceted glass sink from Kohler measures 17.5” wide and is sure to catch the eye—as it does the light. $707.50 Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... For some decorative recycling, consider burying old bottles upside down to create edging for your garden beds and walkways... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon