Looking for thoughts concerning the bundeling of MC cables. this is a hotel with numerous (120) 12-2 MC cables going to rooms from an electric room. As you can imagine, a lot of cables in a small space. Does 310.15 (B)(2) cover this, that they can only be bundled for max. 24" before derating,any help please. We just allowed MC in our jurisdiction, so not sure. Thanks in advance
Bundeling MC cable
- Thread starter bkelly
- Start date
- Status
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
See 310.15(B)(2)(a)exception No. 5
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Yes, for over 24" of bundling derating would apply. The reference that Pierre provided can give you some relief from the derating of MC cables. With 120 cables they would have to be put in small bundles according to the parameters of 310.15(B)(2)(a)ex. 5 to make it work.
chevyx92
Senior Member
- Location
- VA BCH, VA
You can bundle mc with no more than a total 20 CCC per 310.15(B)(2) Exception 5.
You have 120 12/2 mc's, so you could have 12 bundles of 10 mc's if you wanted.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
If this were me I would use as many MWBC's as possible to cut down on the number of CCC's.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
Might be bad idea in hotel. You would not want 2 or 3 pole breakers. If 1 trips you will have guests being upset if they were not the cause and your turning off there power to reset.
- Location
- Massachusetts
They would have to be on 15 amp breakers because you can not roll up the the next size with multi outlet branch circuits.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
For the sake of extending the knowledge of the good book, I'm wondering if it's compliant
on this example to come off a 20a c.b. right into an 18a fuse holder (yuck) then connect
to the branch circuit conductors?
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