Permissable ???

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Dave Brenchley

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Good Day Folks !!
I have a requirement where I need to have available at a receptecle 208@30A or 120@30Amps.

Can a single 4Pole receptacle be used and the mating plug wired to provide 208 or 120 ?? Or would I be required to provide 2 recepticles ??

The application involves a theatrical followspot position where the standard device in use would require 120 but a touring company may replace it w/ one requiring 208.
 
Re: Permissable ???

I would say you should install seperate receptacles for 208V and 120V. I don't believe the code allows you to do what you want, since I seem to recall it requires a different style of receptacle for each different voltage level.
 
Re: Permissable ???

Install 2 seperate receptacles would be the best. I hope you weren't plannin on sharing the circuit for this/these outlets. It may be nice in theory, but is not correct.
Besides, you know that eventually you will need both lights to be plugged in at the same time (SOP for theaters). This way you would have power for both.
 
Re: Permissable ???

Peter .. L6 style plugs would be used ..
Pysis .. willies are the little things that back the hair on the back of your neck stand on end ..

Is there a NEC article that addresses this I could reference ??

What's the difference when a device .. say a UPS or a Dimmer takes 2 208 legs & a neutral and outputs 120 ??

THANKS for your help ..
 
Re: Permissable ???

I can't think of a code that prohibits it, that does'nt mean there aren't any, most of these other guys know the code better than me.

Although I don't like the idea I think it's an interesting code question.

As for the UPS, I doubt there are any multivoltage receptacles on it.
 
Re: Permissable ???

Well, down hill it goes.

Mine includes indecision and jitters. I can't even believe it's in a dictionary.
 
Re: Permissable ???

406.7 Noninterchangeability. Receptacles, cord connectors,and attachment plugs shall be constructed so that receptacle or cord connectors do not accept an attachment plug with a different voltage or current rating from that for which the device is intended. However, a 20-ampere T-slot receptacle or cord connector shall be permitted to accept a 15-ampere attachment plug of the same voltage rating. Non?grounding-type receptacles and connectors shall not accept grounding-type attachment plugs.
 
Re: Permissable ???

THANKS Peter
Appreciate the research, but it doesn't seem this article is applicable. It refers to the manufacture of devices, and seems to imply an exception scenario simular to mine save it's current and not voltage. ie a 120v 30a rect can accept a 20a plug. Why have a 208 4 pole device if the intent is not to aquire 120v. What purpose would the neutral serve unless it was used on a motor circuit or a device that required 120 ????

here again folks THANKS ..

... enjoyed the willie story ..
 
Re: Permissable ???

How bout 406.3(F) then.

_____________________________________________________

If Hans can get the Willies so can you.

Larry's Willies

[ June 01, 2005, 07:09 PM: Message edited by: physis ]
 
Re: Permissable ???

Originally posted by petersonra:
406.7 Noninterchangeability. Receptacles, cord connectors,and attachment plugs shall be constructed so that receptacle or cord connectors do not accept an attachment plug with a different voltage or current rating from that for which the device is intended.
Click to expand...
Looks like your answer to me. You don't have to like it.
 
Re: Permissable ???

By Dave Brenchley:

and seems to imply an exception scenario simular to mine save it's current and not voltage
Click to expand...
I agree with you that 406.7 is addressing "construction". But I want to point out that

20-ampere T-slot receptacle or cord connector shall be permitted to accept a 15-ampere attachment plug of the same voltage rating.
Click to expand...
has nothing to do with what you're talking about doing. If you look at 220.21(B)(3) and it's Table you'll see why that provision exists.
 
Re: Permissable ???

If you installed a NEMA L14-30 in the wall and fed it with the proper circuit.

:confused:

[ June 02, 2005, 06:01 AM: Message edited by: iwire ]
 
Re: Permissable ???

Not to encourage the practice, but lets say he uses the L14-30R receptacles. (H-H-N-G)

What is to stop one from wiring the two hots and ground on the L14-30P for their 208V load? (leaving the neutral unconnected in the plug)

What is to stop one from wiring one hot, neutral, and ground on the L14-30P for their 120V load? (leaving the other hot unconnected in the plug)
 
Re: Permissable ???

Can't get my hands on the NEC till later today. Could someone please cut and paste 406.3(F).
THANKS !!!

Iwire .. your are 100% correct .. I used an incorrect reference to the plug/recept style. My intent was to use a 4 pole device .. ie L14.

Two recepts is likely the unquestionable solution.
The question arose because I posed it to an EC on the job and he was empathic it would be a violation but could not document it. I was hoping you folks could shed some light.
 
Re: Permissable ???

I can't "cut and paste" it but I can tediously and laboriously, one letter at a time, transcride it. Just dramatizing. :D

406.3(F) Noninterchangeable Types. Receptacles connected to circuits that have different voltages, frequencies, or types of current (ac or dc) on the same premises shall be of such design that the attachment plugs used on these circuits are not interchangeable.
Click to expand...
Bob, are you saying that this doesn't disallow the idea?

Edit: I left out a space and that made it look funny.

[ June 02, 2005, 02:13 PM: Message edited by: physis ]
 
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