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#100330 - 11/12/06 09:27 AM MC question  
kencr  Offline
Member
Joined: Jul 2004
Posts: 35
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 09:51 AM Re: MC question  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#100332 - 11/12/06 09:57 AM Re: MC question  
kencr  Offline
Member
Joined: Jul 2004
Posts: 35
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


#100333 - 11/12/06 10:15 AM Re: MC question  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Sounds like a great use of 12/4 MC


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#100334 - 11/12/06 01:48 PM Re: MC question  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
More then three current-carrying conductors... did you de-rate? [Linked Image]


#100335 - 11/12/06 04:01 PM Re: MC question  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
I thought you aren't allowed to remark small guage branch circuit wiring.

Dave


#100336 - 11/12/06 04:06 PM Re: MC question  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
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


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#100337 - 11/12/06 04:18 PM Re: MC question  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
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


#100338 - 11/20/06 03:44 PM Re: MC question  
tdhorne  Offline
Member
Joined: Mar 2001
Posts: 345
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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