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post #1 of (permalink) Old 01-31-2004, 01:31 PM Thread Starter
 
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Wiring 230V for a welder

Well, I pulled my wire last night and installed the recepticle but when I went to install the breaker into the load center, I discovered, though there appeared to be plenty of open slots, most have no connection lugs that mate to the breaker. [img]images/graemlins/mad.gif[/img]

Really blew goal of getting sparky fired up before midnight!

So I get to looking closer at things and it brings up a few questions.
There are two bus bars entering the load center from the meter box. Do I have to pull a feed from each of these to accomplish my 230 or could both halves of my 30 amp breaker pull from the same feed?

I do have a 230 AC unit in my sunroom that appears to pull from one feed.

I have one single module slot open on the load center (like for a typical 15 amp breaker) Does this mean I will be forced to install a separate breaker box? [img]images/graemlins/crybaby.gif[/img]
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post #2 of (permalink) Old 01-31-2004, 01:45 PM
 
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Re: Wiring 230V for a welder

Did you purchase the same brand breaker as your box?

I believe they are all slighty differant ie a siemens breaker will not fit a square d box, vise versa, and even in the same brands i believe there are differances. maybe i dont understand your problem exactly but thats what it sounds like to me.


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post #3 of (permalink) Old 01-31-2004, 01:53 PM Thread Starter
 
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Re: Wiring 230V for a welder

Good question! Yes, GE Box and GE breaker. The GE breaker has small contacts in a slot on one edge. This slot sets in a verticle orientation with the breaker setting horizontal. The one single slot that is available, has the tab that fits into the contacts on the breaker, but what appeared to me to be open slots on the opposite side of the load center have no contacts. I'll run outside with my digital and see if I can get a close pic.
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post #4 of (permalink) Old 01-31-2004, 02:13 PM Thread Starter
 
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Re: Wiring 230V for a welder

Arrow points to the tab that I was referring to in my last post.

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post #5 of (permalink) Old 01-31-2004, 04:24 PM
 
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Re: Wiring 230V for a welder

here is your answer



you have both 1" single and 2" double breakers and 1/2" breakers the top is the 2" double and the 3 on the botom right are the 1/2"

to get the correct current you have to have 2 hots meaning 1 hot from one big bar and 1 from the other big bar
which comes in from the front



the 1/2's jump in from the lil'sideways bars

just go to home depot and get some 1" piggy back breakers convert a couple of 1" singles to the piggy backs and free up 2 1" slots



when you use the piggy back breakers i would try to double up odd stuff like something that does not get used at the same time like a bedroom circuit to not overload the bus bar

what size wire are you useing and dont forget about voltage drop

you can get away with 8ga cu(copper) on a 50 amp for a short distance but you really should use 6ga cu or you can use alum. but it has 2 be around 2 sizes bigger like 1 Ø-(ought)

ofcourse the safty stuff now
never overload your main or the feeder wire to the panel
if it trips do not increase the breaker size with out the wire size increased
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post #6 of (permalink) Old 01-31-2004, 05:04 PM
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Re: Wiring 230V for a welder

That's exactly what I did, is piggy backed two 15amp bedroom circuits together and replaced the left over space plus the existing garage circuit with a 60 amp main. Then I ran that to a sub box with 6/3 copper wire. Since I now have a sub box in my garage, I can add more than one 220 out let if wanted (ie a 50 amp for a welder and a 15 for air), and some dedicated 120's for power tools.
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post #7 of (permalink) Old 01-31-2004, 10:38 PM
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Re: Wiring 230V for a welder

What am I missing? You’ve got a spot for a double don’t you?

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post #8 of (permalink) Old 02-02-2004, 12:29 PM Thread Starter
 
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Re: Wiring 230V for a welder

Yea Taz,
I thought that I could use a double in that slot, but if you could see in the pic, you can't get one into that slot. The Home Depot Guru said that these load centers are designed so that you can not fill every slot.

Actually, I replaced the 2 1" single pole breakers feeding my sub panel with 1 double pole 1". This left enough open slots for my double pole 30 amp for the welder.

Was going to post back Saturday with the solution but was having too much fun melting steel. [img]images/graemlins/burnout.gif[/img]

Hopfully others will benifit from all of the solutions posted.

Thanks! [img]images/graemlins/grin.gif[/img]
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