jerrystull
New member
- Location
- Strasburg, Virginia
How many "tightly" bundled 10/2 MC cables can be safely together? I asked for no more than 8, The JHA designer said up to 4" in one bundel. Does heat build up mean anything?
usace inspector
- Thread starter jerrystull
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician
It all depends on what you end up with after doing a derating calculation. Picking numbers (like no more than 4 or 8) out of the air will accomplish nothing. And yes heat is the issue with bundling cables together.
Welcome to the forum.
Welcome to the forum.
The exception in 310,15(B) might give some insight:
Exception No. 5: Adjustment factors shall not apply to Type AC cable or to Type MC cable without an overall outer jacket under the following conditions:
(1) Each cable has not more than three current-carrying conductors.
(2) The conductors are 12 AWG copper.
(3) Not more than 20 current-carrying conductors are bundled, stacked, or supported on ?bridle rings.?
A 60 percent adjustment factor shall be applied where the current-carrying conductors in these cables that are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing exceeds 20.
Exception No. 5: Adjustment factors shall not apply to Type AC cable or to Type MC cable without an overall outer jacket under the following conditions:
(1) Each cable has not more than three current-carrying conductors.
(2) The conductors are 12 AWG copper.
(3) Not more than 20 current-carrying conductors are bundled, stacked, or supported on ?bridle rings.?
A 60 percent adjustment factor shall be applied where the current-carrying conductors in these cables that are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing exceeds 20.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Yup, that exception is very handy when running #12 AWG MC cable, however he's asking about #10 AWG.
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