310-15(b)(2)(a)

[jonaslc]

I was told that there was an exception #5 for this article. I am using a 1999 code book and I do not see an exception 5. If this has changed in the 2002, could someone please tell me what that exception is.

 

[david]

Re: 310-15(b)(2)(a)

310.15 Ampacities for Conductors Rated 0?2000 Volts.
(B) Tables.
(2) Adjustment Factors.

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:
(a) Each cable has not more than three current-carrying conductors.
(b) The conductors are 12 AWG copper.
(c) 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.

 

[stamcon]

Re: 310-15(b)(2)(a)

There was an exemption in the prior code that was deleted in the '99 NEC. I don't what it was or if the '02 has it back or a different exemption as #5.