What do I need 6-3 or 6-2 NM?

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Old 01-22-09, 07:41 PM
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What do I need 6-3 or 6-2 NM?

I've read many posts here, I think I have an answer to my question but let's see.

I want to run a straight 50a circuit off my main panel (I have room/capacity) for a plasma cutter. The peak input amperage at max rated output is 34amps. It came with a CSA 6-50P - like many welders. If its dedicated as a "welder" circuit, I should only require a run of 6-2NM, correct? Pricey difference between 6-2/6-3...

Also anyone have suggestions for where to purchase wiring online - thinking it may be cheaper that HDs price of $1.97/$2.56/ft respectively.

(I know it may be a little overkill, I think 8NM is all that is required for 40AMPs)

Thanks,
Mike
 
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Old 01-22-09, 08:14 PM
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6-2 with ground is correct for your application. Unlike a range, your plasma cutter does not require a neutral.
 
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Old 01-23-09, 11:31 AM
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Thanks Tony - just thought I'd check to be sure before I purchased...
Mike
 
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Old 01-23-09, 12:34 PM
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Originally Posted by mtncrawler View Post
I should only require a run of 6-2NM, correct? Pricey difference between 6-2/6-3...
#6-2 is the correct cable.

Also anyone have suggestions for where to purchase wiring online - thinking it may be cheaper that HDs price of $1.97/$2.56/ft respectively.
$2/ft is reasonable for that size. Wire price is basically tied to the market price per pound of copper so you aren't going to find major deals. With shipping cost, I doubt anyone can beat a local price, of course it can't hurt to check the supply houses too. If your required length is just shorter than a standard length, it will probably be cheaper to buy a packaged coil than pay per foot.
 
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Old 01-23-09, 12:50 PM
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Thanks Ben,

Yeah, I know I probably won't find any big deals

Funny though, when I was at HD looking for the 6-2, I happened upon a "remnant" 28' feet of 10/4 type SOOW 600V power cord. I've been contemplating making a 30a extension cord for my welder, as it turns out, this is the exact Carol cord that came with my welder..woohoo. Offered him a $1 a foot (which was maybe $.50 off) and he took it..

Mike
 
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Old 01-23-09, 05:38 PM
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28" of SOOW 10/4 cord for $28. Thats a good deal.

BTW - Not sure if you bought the wire yet or not but check the boxed prices. A lot of times you can get a much better deal if you just buy say a 50' box of boxed wire compared to the stuff they cut for you. Even if you don't use it all the still may be cheaper.
 
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Old 01-23-09, 06:22 PM
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Toyln,

Nice tip - I'll check into that. I remember seeing some 100' rolls, but it was all 6-3. May still be cheaper to buy it, use what I need (even though I only need 6-2) and sell the rest. Can't recall the price though.

BTW - Sorry, think I addressed you as Tony in an earlier post.

Mike
 
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Old 01-23-09, 09:22 PM
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Originally Posted by mtncrawler View Post
BTW - Sorry, think I addressed you as Tony in an earlier post.

Mike
No problem. It happens ALL the time!

If they have 6/3 they should have 6/2.I checked the HD page an they only list the boxed stuff type UF. Do not get that! It is a huge PITA to work with. Maybe try another big box store? Lowes? Menards?
 
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Old 01-23-09, 11:21 PM
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Originally Posted by mtncrawler View Post
, I happened upon a "remnant" 28' feet of 10/4 type SOOW 600V power cord. I've been contemplating making a 30a extension cord for my welder, as it turns out, this is the exact Carol cord that came with my welder..woohoo. Offered him a $1 a foot (which was maybe $.50 off) and he took it..

Mike

However there is one little overlooked gotcha due I know the Cord manufacter and I do have the ampcapity listing somewhere in the other computer but you can not run full 30 amp with 10/4 SOOW more like about 25 amp IIRC if I read it right.

Anyway that is pretty good deal to grab that cord.

Merci,Marc
 
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Old 01-24-09, 05:13 AM
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[QUOTE
If they have 6/3 they should have 6/2.I checked the HD page an they only list the boxed stuff type UF. Do not get that! It is a huge PITA to work with. Maybe try another big box store? Lowes? Menards?[/QUOTE]

Yeah, for sure. I laid some UF some time ago (to wire a garage). I'm headed to Lowes today to see if I can find it.

Marc,

You are absolutely right, the 10/4 is only rated as 25amp cord from General Cables website "Carolprene". My welder is a Miller 200DX inverter drawing ~28amps at rated output (don't have the manual handy, but the power cord that came on the welder is Carolprene 12/4), and my plasma is a HT PowerMax45 drawing 28-32 at rated output. I think I'll be OK, since, aside from arc initiation and if I'm welding/cutting at full capacity for longer periods of time, the cable shouldn't see anything "continuous" over 25amp. Would you caution otherwise?

Appreciate both of your help!
Mike
 
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Old 01-24-09, 10:11 AM
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Just a prolog to wire shopping...

Went to Lowes this morning and the 6-2NM was $1.65/ft (much better than HD). I asked the wire guy if they sold it in rolls (50/100') and he said no - how much you need? 60ft I tell him. Can you do any better on the per/ft price by chance, I say. So after BS'ing about home projects, he says, tell you what, I'll sell you 60ft for the price of 50ft .

So ended up paying $1.38/ft.

Never know unless you ask sometimes
 
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Old 01-24-09, 12:01 PM
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You sir, are my hero! Beer 4U2
 
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Old 01-25-09, 08:53 AM
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:NO NO NO:

Hero? Not quite, just got a little lucky!

Take care,
Mike
 
 

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