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#100330 - 11/12/06 05:27 AM MC question
kencr Offline
Member
Registered: 07/25/04
Posts: 36
Loc: Southern, NJ USA
We have a boat load of 12-4 mc cable which we would like to use up. It was bought at an auction.
One thing we could use it for ( I think ) is to run two 2 pole 208 volt circuits to one location.
Would this be allowed by code ?

Black - White one 208 circuit

Blue - Red one 208 circuit

Green shared ground.

Yes ?? No ?? Maybe ??

Thanks
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#100331 - 11/12/06 05:51 AM Re: MC question
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
200.7(C)(1) allows the use of the white in a cable assembly for an ungrounded conductor if you remark it.

So yes you can run two 208 circuits.

However when I see 12/4 I am thinking one multi wire branch circuit.

Black A

Red B

Blue C

White N



[This message has been edited by iwire (edited 11-12-2006).]
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#100332 - 11/12/06 05:57 AM Re: MC question
kencr Offline
Member
Registered: 07/25/04
Posts: 36
Loc: Southern, NJ USA
iwire

Yes I use it for that also.

We do a pizza chain that has two 208 volt ovens. 4 -11/16 box mounted oven hood with one 12-3 drop cord to each oven. The 12-4 will work great. Just one wire to j box.

Thanks for your input
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#100333 - 11/12/06 06:15 AM Re: MC question
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Sounds like a great use of 12/4 MC
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#100334 - 11/12/06 09:48 AM Re: MC question
renosteinke Offline
Cat Servant
Member
Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
More then three current-carrying conductors... did you de-rate?
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#100335 - 11/12/06 12:01 PM Re: MC question
Tiger Offline
Member
Registered: 05/04/05
Posts: 714
Loc: Crystal Lake, IL USA
I thought you aren't allowed to remark small guage branch circuit wiring.

Dave
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#100336 - 11/12/06 12:06 PM Re: MC question
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Tiger as a general rule you can not.

However there are some exceptions for the white in cable and cord assemblies.

You can find these in 200.7
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#100337 - 11/12/06 12:18 PM Re: MC question
Tiger Offline
Member
Registered: 05/04/05
Posts: 714
Loc: Crystal Lake, IL USA
200.7(C)(3)?

Thanks iwire.

Also, I thought the 208 volt leg (of a delta 3PH) is only to be used for 3 phase, not single phase.

Dave
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#100338 - 11/20/06 11:44 AM Re: MC question
tdhorne Offline
Member
Registered: 03/22/01
Posts: 344
Loc: Maryland, USA
Dave
The installation that people seem to be talking about here is with wye connected three phase were the voltage to ground is the same on all three phases.
_________________________
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison
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