Double Duplex Receptacle grounding with SDC

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dlmerchant

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Windham, NH
Hello guys - I have a customer that would like to have a double duplex receptacle installed. One side of the receptacle would be a 120v 20a feed from a UPS power distribution panel. The other side would be a 240v 20a single phase (6-20R) feed from a utility-fed sub panel. Is it ok for these two circuits to share a common outlet box without isolation? Following that same thought, should be grounds be bonded? Thanks guys!
 
Since the two circuits are on the same yoke they would require simultaneous disconnect (handle tie or multi-pole CB) which cannot be done with circuits originating from different panels. The EGC's can be connected together.

Welcome to the Forum. :)
 
infinity said:
Since the two circuits are on the same yoke they would require simultaneous disconnect (handle tie or multi-pole CB) which cannot be done with circuits originating from different panels. The EGC's can be connected together.

Welcome to the Forum. :)
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Thanks, Rob. I suspected that would be the answer.
 
dlmerchant said:
Hello guys - I have a customer that would like to have a double duplex receptacle installed. One side of the receptacle would be a 120v 20a feed from a UPS power distribution panel. The other side would be a 240v 20a single phase (6-20R) feed from a utility-fed sub panel. Is it ok for these two circuits to share a common outlet box without isolation? Following that same thought, should be grounds be bonded? Thanks guys!
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Since you mentioned "double duplex receptacle", it is possible. even probable, that you are actually talking about two receptacle yokes, each holding two receptacles.
If that is the case, you can put the two in the same box without any restrictions, although it would be desirable or maybe required to somehow (color, tags, tape, etc.) identify the two sets of conductors as coming from two different systems.

The previous response would apply if, for example, you took a single duplex receptacle on one yoke, broke off the links, and connected each receptacle to a different 120V AC source not originating in the same panel.
 
GoldDigger said:
Since you mentioned "double duplex receptacle", it is possible. even probable, that you are actually talking about two receptacle yokes, each holding two receptacles.
If that is the case, you can put the two in the same box without any restrictions, although it would be desirable or maybe required to somehow (color, tags, tape, etc.) identify the two sets of conductors as coming from two different systems.

The previous response would apply if, for example, you took a single duplex receptacle on one yoke, broke off the links, and connected each receptacle to a different 120V AC source not originating in the same panel.
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Correct - No split yokes. A total of 4 receptacles (2 yokes) is specified. Each yoke fed by a different AC source (UPS and Utility).
 
dlmerchant said:
Correct - No split yokes. A total of 4 receptacles (2 yokes) is specified. Each yoke fed by a different AC source (UPS and Utility).
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Then you're OK. You use of the words receptacle and side in the OP threw me off. Sorry for the confusion.

One side of the receptacle would be a 120v 20a feed from a UPS power distribution panel. The other side would be a 240v 20a single phase
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dlmerchant said:
Hello guys - I have a customer that would like to have a double duplex receptacle installed. One side of the receptacle would be a 120v 20a feed from a UPS power distribution panel. The other side would be a 240v 20a single phase (6-20R) feed from a utility-fed sub panel. Is it ok for these two circuits to share a common outlet box without isolation? Following that same thought, should be grounds be bonded? Thanks guys!
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They can share a common box w/o isolation, and if you mean grounds tied together, yes. Since they should both be #12 wire, either ground can bond the box.

Such setups (120 and 240V recepts in same box) are fairly common in exercise rooms that could have both 120 and 240V equipment.
 
JFletcher said:
They can share a common box w/o isolation, and if you mean grounds tied together, yes. Since they should both be #12 wire, either ground can bond the box.

Such setups (120 and 240V recepts in same box) are fairly common in exercise rooms that could have both 120 and 240V equipment.
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The key is that the 240 is just 120V to the neutral, just like the other circuit(s).
If you have 240 to neutral, it would be more of a problem sharing a box. But the wire insulation for that 240 and the 120 is just the same.
 
infinity said:
Since the two circuits are on the same yoke they would require simultaneous disconnect (handle tie or multi-pole CB) which cannot be done with circuits originating from different panels. The EGC's can be connected together.

Welcome to the Forum. :)
Click to expand...

He stated "double duplex" which would put the two circuits on separate yokes, right?
In that case, he should be OK.

I thought I was responding to the last post, and now I don't see how to delete mine.
I can edit it, but would have just as well deleted it...................
 
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GoldDigger said:
The key is that the 240 is just 120V to the neutral, just like the other circuit(s).
If you have 240 to neutral, it would be more of a problem sharing a box. But the wire insulation for that 240 and the 120 is just the same.
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iwire said:
:?
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I am guessing he is referring to 404.(8)(B) and 406.(5)(H). 2 devices in one box with 300V or more between between them.

We usually run into this with 277V and 120V switches, but applies to receptacles also.

IDK what the voltage difference would be between a 120V L-N device and a 240V L-N device, but Goldy presents that it could be problematic.
 
jumper said:
I am guessing he is referring to 404.(8)(B) and 406.(5)(H). 2 devices in one box with 300V or more between between them.

We usually run into this with 277V and 120V switches, but applies to receptacles also.

IDK what the voltage difference would be between a 120V L-N device and a 240V L-N device, but Goldy presents that it could be problematic.
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Depending on which Ls are used, it could be either 120V or 360V unless three phase is involved.

mobile
 
240V L-N? In the US, what xfmr would have that setup?

Can a nema 6-20R be legally wired 240V (or 208V high leg) one side with a neutral? Im guessing they can be used on a 240V delta service, tho that would be 2 hots and a ground. Are they rated for 240/250V to ground?
 
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