2P GFCI Breaker serving one yoke.

[480sparky]

............I just mentioned that there is 240V present at the single yoke device that is rated for 125V....... Just surprised me is all.

Each receptacle is supplied with the voltage it is rated for. The fact that there's 240v between them makes no difference. There are no 240v loads, so it doesn't need to be rated for 240v.

 

[winnie]

Remember that most receptacles' ratings are based on slot configuration, and not current-carrying or insulative parts' capacities.

I believe that this is the key. If you look at the construction of a 240V 15A receptacle, you will find it very similar to that of a 120V 15A receptacle.

If you look at twist lock cord caps, you will find similar construction for different voltage levels of the same amp rating.

I am sure that there is an insulation rating on these receptacles and cord caps, and a maximum rated voltage between terminals, but these numbers are rather different (and much higher) than the nominal voltage rating of a particular slot/blade configuration.

-Jon

 

[kwired]

Nope. Parallleling.

You could use one and abandon/remove the other.

It is not a parallel circuit if the tab at the receptacle is broke off, which I believe he said it was it is no different than running four conductors to two different locations - the load ends are not connected together.

 

[roger]

Nope. Parallleling.

You could use one and abandon/remove the other.

It wouldn't be paralleling, Chris said both tabs were broken out so the two grounded conductors are going to seperate devices.

Roger

 

[roger]

Oooops, I didn't see Kwired had already posted.

Roger

 

[ELA]

Remember that most receptacles' ratings are based on slot configuration, and not current-carrying or insulative parts' capacities.

Ratings most certainly are based on other criteria such as creep distance and clearance. When you remove the tab between the slots you are left with only ~0.12" of clearance (measured on one receptacle I had available near by). Normally this would not be of any concern when using the second terminal as a switch leg.
In this post's configuration you now have 240V separated by only ~0.12".

There are many different variations of charts for clearances and creep distance. I believe this distance just barely meets the minimums (depending upon the definitive chart used).

One manufacturers data sheet I looked at only specifies 125V and is not specific about its use in this configuration.
As someone mentioned I would certainly want to use the better grade of receptacle if I were using it in this application.

As can be seen in this specification sheet for a Industrial grade device they also include a Dielectric voltage rating. I wonder if this rating is retained when using in this application?

http://www.leviton.com/OA_HTML/ibeCCtpItmDspRte.jsp?item=7895&section=10954&minisite=10021

As I have said I accept others here knowledge on the subject and their comments that it is legal. I just wanted to better define what my initial concern/surprise was.

 

[LarryFine]

It is not a parallel circuit if the tab at the receptacle is broke off, which I believe he said it was it is no different than running four conductors to two different locations - the load ends are not connected together.

It wouldn't be paralleling, Chris said both tabs were broken out so the two grounded conductors are going to seperate devices.

Both correct. My oops.

 

[LarryFine]

In this post's configuration you now have 240V separated by only ~0.12".

Good point, and whenever I have used a duplex thusly, I have always separated the metal edges of the broken-out tab farther apart with a flat-blade screwdriver.