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110 tap off 220 plug? cc 02-09-2007
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Posted by cc on February 9, 2007, 9:48 pm


Is it possible, and safe, to run a 110 outlet off a 220 outlet? The
electrician said it was, but out of code, so he would not. BUT I know
one of the mag's had an article last year which showed how.

I am not an electrician, so please be as clear as possible..thanks..


Radiant Heat 468x60
Posted by RBM on February 9, 2007, 11:06 pm


If you have a 15 or 20 amp dedicated outlet for something like an
airconditioner, it can be converted at the breaker panel from 240 to 120
volt, but if you're looking to tap 120 volts from an existing 240 volt
outlet, it would need a neutral conductor, which many 240 volt outlets won't
have



> Is it possible, and safe, to run a 110 outlet off a 220 outlet? The
> electrician said it was, but out of code, so he would not. BUT I know
> one of the mag's had an article last year which showed how.
>
> I am not an electrician, so please be as clear as possible..thanks..
>



Posted by Toller on February 9, 2007, 11:24 pm



> Is it possible, and safe, to run a 110 outlet off a 220 outlet? The
> electrician said it was, but out of code, so he would not. BUT I know
> one of the mag's had an article last year which showed how.
>
> I am not an electrician, so please be as clear as possible..thanks..
>
How many amps is the circuit?
How many wires is the circuit?

Assuming you want to install a 120v 20a (or 15a) outlet, the 240v circuit
cannont be over 20a (or 15a).
And it will have to be 3wire so you have a neutral for your 120v outlet; and
that would be odd to find on a 20a 240v circuit.

So, you probably have too much amperage, or not enough wires; so you
probably can't do it.
The electrician might have been thinking of using the ground wire as a
neutral. That is certainly against code, and while it would work, isn't
something you want to do. I hope a magazine didn't recommend it.



Posted by mm on February 10, 2007, 12:26 am



>
>> Is it possible, and safe, to run a 110 outlet off a 220 outlet? The
>> electrician said it was, but out of code, so he would not. BUT I know
>> one of the mag's had an article last year which showed how.
>>
>> I am not an electrician, so please be as clear as possible..thanks..
>>
>How many amps is the circuit?
>How many wires is the circuit?
>
>Assuming you want to install a 120v 20a (or 15a) outlet, the 240v circuit
>cannont be over 20a (or 15a).
>And it will have to be 3wire so you have a neutral for your 120v outlet; and
>that would be odd to find on a 20a 240v circuit.
>
>So, you probably have too much amperage, or not enough wires; so you
>probably can't do it.

How can he have too much amperage available? If the wires two the 120
volt circuit are as big as the wires to the original circuit, and the
receptacle is big enough to handle whatever is plugged in, how can
there be too much amperage?

The rest I agree with.

>The electrician might have been thinking of using the ground wire as a
>neutral. That is certainly against code, and while it would work, isn't
>something you want to do. I hope a magazine didn't recommend it.
>


Posted by Chris Friesen on February 10, 2007, 1:21 am


mm wrote:

> How can he have too much amperage available? If the wires two the 120
> volt circuit are as big as the wires to the original circuit, and the
> receptacle is big enough to handle whatever is plugged in, how can
> there be too much amperage?

I'm assuming that the OP wants to hook up a standard 15A duplex
receptacle. If the original circuit is more than 20A then generally you
cannot wire a 15A receptacle to it.

Chris

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