Electrical Engineering - 220v for welder

Author

220v for welder

inspired13

2007-04-11, 3:25 am

Hi all:

I am trying to wire a new receptacle to a pre-existing 220v line that
was for
a dryer in my shop- the welder requires a 30 A line which this one is,
and needs
a NEMA 6-50 receptacle. I can see that the dryer receptacle has two
hots ( red and black) and a neutral white- however, i see that the
6-50 needs two hots and a ground.
I am assuming that this means the existing line can still be used with
a few modifications- it is 10/3- .....tape a green indicator on both
ends of the white and make that a ground? is this correct Thanks for
any help-!

SparkyGuy

2007-04-11, 3:25 am

> I can see that the dryer receptacle has two
> hots (red and black) and a neutral white- however, i see that the
> 6-50 needs two hots and a ground.

What gauge (size) are each of the wires?
--
Sparky

gfretwell@aol.com

2007-04-11, 3:25 am

On 10 Apr 2007 21:05:25 -0700, "inspired13"
<anthonycastronovo@gmail.com> wrote:

>Hi all:
>
>I am trying to wire a new receptacle to a pre-existing 220v line that
>was for
>a dryer in my shop- the welder requires a 30 A line which this one is,
>and needs
>a NEMA 6-50 receptacle. I can see that the dryer receptacle has two
>hots ( red and black) and a neutral white- however, i see that the
>6-50 needs two hots and a ground.
>I am assuming that this means the existing line can still be used with
>a few modifications- it is 10/3- .....tape a green indicator on both
>ends of the white and make that a ground? is this correct Thanks for
>any help-!

That will work fine.

Long Ranger

2007-04-11, 3:25 am

"inspired13" <anthonycastronovo@gmail.com> wrote in message
news:1176264325.819797.150910@b75g2000hsg.googlegroups.com...
> Hi all:
>
> I am trying to wire a new receptacle to a pre-existing 220v line that
> was for
> a dryer in my shop- the welder requires a 30 A line which this one is,
> and needs
> a NEMA 6-50 receptacle. I can see that the dryer receptacle has two
> hots ( red and black) and a neutral white- however, i see that the
> 6-50 needs two hots and a ground.
> I am assuming that this means the existing line can still be used with
> a few modifications- it is 10/3- .....tape a green indicator on both
> ends of the white and make that a ground? is this correct Thanks for
> any help-!
>

You have the "old" style dryer plug. The neutral was used as a ground. Since
it is a neutral, and a ground, it has to be insulated, since it carries
current. The new standard is for four wires, which is a separated neutral
and ground. I wouldn't waste time taping anything, the electrons will never
know the difference. Since your new welder is strictly "220", the wire will
be used as a ground only. The only reason your dryer needed a neutral was
for the light bulb inside the tumbler, and sometimes the control wiring.
Strictly speaking, you are not allowed to tape a wire to identify it unless
it is at least a number two. If you must be anal about it, you are allowed
to strip the wire bare to identify it as a ground, but then what happens
when you need it as a neutral again?

inspired13

2007-04-11, 9:25 am

I should have clarified this- would the neutral be used as ground-
or should the ground line to the receptacle actually be moved from
the
neutral bar in the panel to ground?

Thanks again-

Long Ranger

2007-04-11, 1:25 pm

"inspired13" <anthonycastronovo@gmail.com> wrote in message
news:1176301123.932508.200560@w1g2000hsg.googlegroups.com...
>I should have clarified this- would the neutral be used as ground-
> or should the ground line to the receptacle actually be moved from
> the
> neutral bar in the panel to ground?
>
>
> Thanks again-
>
Yeah, that's different. If the circuit comes from a sub-panel, the wire
needs to be moved to the ground bar. (If it did, it would be wrong anyway,
for a dryer outlet.) If it's the service panel, the ground and neutral
should be on the same bar. Sometimes people separate into two bars for
housekeeping purposes, but they should both be bonded together in the
service panel.

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