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-   -   220V 100A Circuit (http://www.diychatroom.com/f18/220v-100a-circuit-18892/)

canadaisintexas 03-23-2008 11:52 PM

220V 100A Circuit
 
I'm building a shop for to be used for various automotive projects. I need to end up with 1 220V and 1 110V wire leading in to the shop. I already have prebuilt boxes (possibly called breaker, not familiar with electrical terminology i'm afraid) that will split the 220V and 110V sources in to many outlets. I'm going to need 80 amps via the 220V source and 20 amps via the 110v source. The house has 200 amp service and I have enough capacity as under 100 amps are currently used. What I need is a walkthrough (preferably with pictures, although anything will help) as to everything I need to do to take my existing 200 amp box in the garage and end up with these 2 wires running out of the garage. Preferably without adding another box in the garage, although I can do so if nescessary. I don't need any help with the construction/how to run wires side, just the electrical wiring/hardware side. If no one can provide what I need, links or a point toward certain books that would teach this would be greatly appreciated, and don't worry guys, i wont be doing this until I feel I have enough knowledge to do so safely and even then it will be checked by a qualified electrician before any switches get flipped.

Thanks,
Rob

CowboyAndy 03-24-2008 05:31 AM

Well, you can't take and "split" the a 240v circuit into 2... what you would need is a subpanel. You mentioned that you have a "prebuilt box" that will split it? Is this possible a subpanel? What you would need is to run a 100AMP sub panel to your shop. There are a few generic walk though/faq's on subpanels around somewhere.

You are going to need 3 wire + ground for this.

Speedy Petey 03-24-2008 07:43 AM

http://www.selfhelpandmore.com/homew...rage/index.htm

JGarth 03-24-2008 08:46 AM

This is a CLASSIC.

canadaisintexas 03-24-2008 10:00 AM

Quote:

Originally Posted by JGarth (Post 110279)
This is a CLASSIC.

To everyone else: Thanks for the help, ill check out that link.

Garth: I sincerely thank you for your extremely helpful input, now if you could kindly find someone else's thread to go "help" I would much appreciate it:thumbsup:

Thanks,
Rob

Stubbie 03-24-2008 10:46 AM

Welcome to the forum Rob

You are welcome to ask your questions here. Shows you want to know how to do this safely. Understand though that what your doing is a bit more than changing out a light switch. I have no way of knowing your skill level with electrical but from your post you are pretty new. That's OK we all started at the beginning sometime.....:)

I would suggest at least going to the big box store and buying a few books that will show how to install a sub-panel in a detached building. Use these to guide you and get a little info on how things are done and more importantly why they are done. It is critical that you have an understanding of what your looking at when you take the cover off that garage breaker box. Just having someone say connect this here and that there is no way to do electrical work. You need to understand why your connecting things to certain points. Electricity will kill you. If you energize the installation and it is wired wrong it may kill someone else. So respect what your doing.... electricity isn't comparable to a plumbing leak.

The fact that you are asking questions on this forum shows me you have the common sense to do a little research and get advice. That is a big step in the right direction.

You are going to need to install a "sub-panel" in your shop.

We will be glad to help you. Ask your questions... most of us will not belittle you . I only ask that you be honest with yourself... if our answers to your questions cause confusion please get an electrician to install this sub-panel. And be darn sure your local codes department inspects the installation regardless... for sake of safety to others and yourself.

If I thought it was feasible I would have the a DIY forum rules require posting of the "permit for inspection" before answering a "how to install" question like yours. I'm not trying to be mean.... just that it is that important.

canadaisintexas 03-24-2008 10:54 AM

Stubbie: Do you have any recommendations of specific books or just any general book on the subject from a big box store?

As far as safety, the $ isn't the reason I want to do this myself, it's a desire to learn new things. Everything I do will be thoroughly checked by a qualified electrician before any power gets turned back on, and like I said, i'm not even going to start trying to do this until I feel like I have a good enough knowledge of what's going on to be able to do so safely.

Thanks,
Rob

Stubbie 03-24-2008 11:45 AM

Hi Rob

That's fair enough in my book.

As for books I would just go through the ones they have available and see if in the table of contents if they have a sub-panel install. Then buy the one you think is best for your needs. It doesn't have to be to a detached building install we will tell you any differences as we go.

Lets start the process of getting you on the right track.

I believe you said this is mainly a one man shop. You have a total load of 80 amps for your 220 equipment. And 20 amps for 120 volt items.

If you want you might break these loads down for us so we know what you are going to be operating in the shop.

A 100 amp sub-panel should be fine as I don't fore see you using all 80 amps of the 220 equipment at once plus the 120.

To get started with some questions.....

1.) Sounds like the shop is detached and separate from your home is that correct...?

2.) Are you wanting an overhead supply to the shop or conduit underground or do you want to direct bury wires? My recommendation is underground in PVC conduit if possible.

3.) How far from the 200 amp panel to the location where you think you would mount the breaker panel ('sub-panel') in the shop? You don't have to be dead accurate but a good approximation.

canadaisintexas 03-24-2008 04:56 PM

Shop will actually be attatched, and the sub panel will be approximately 40 feet away from the main.

CowboyAndy 03-24-2008 05:27 PM

Then you don't need a ground rod, just a 3 wire + ground cable.


The neutrals and grounds in the sub panel must be seperate.

mr500 03-24-2008 05:42 PM

If it is attached cant he just run a 3 wire set up on this?

Speedy Petey 03-24-2008 05:44 PM

Quote:

Originally Posted by mr500 (Post 110431)
If it is attached cant he just run a 3 wire set up on this?

3-wire PLUS a ground.

canadaisintexas 03-24-2008 05:47 PM

So i need to find a book that covers wiring a "3 wire plus ground subpanel"?

Also, I was told that if the subpanel is in the shop I can split between 240 and 120 in the subpanel in the shop and don't need to run seperate wiring for 240 and for 120 all the way from the main to the subpanel, is this correct?

Thanks for all the help!

jerryh3 03-24-2008 06:35 PM

Quote:

Originally Posted by canadaisintexas (Post 110437)
So i need to find a book that covers wiring a "3 wire plus ground subpanel"?

Also, I was told that if the subpanel is in the shop I can split between 240 and 120 in the subpanel in the shop and don't need to run seperate wiring for 240 and for 120 all the way from the main to the subpanel, is this correct?

Thanks for all the help!

Yes. You'll be able to run both 240 and 120 from the subpanel. Just a question...what are you going to run with 240 that you will need 80A? Welders, compressors?

Speedy Petey 03-24-2008 06:39 PM

Quote:

Originally Posted by canadaisintexas (Post 110437)
So i need to find a book that covers wiring a "3 wire plus ground subpanel"?

Also, I was told that if the subpanel is in the shop I can split between 240 and 120 in the subpanel in the shop and don't need to run seperate wiring for 240 and for 120 all the way from the main to the subpanel, is this correct?

Thanks for all the help!

Yes. That is the point of the sub-panel.


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