The only time it becomes an issue is if a couple cables are bundled in the foam or going through a penetration sealed with foam. You treat it like a raceway at that point. (you derate)
334.80
Yes but i am confused Greg....
334.80 forbids 310.15 A 2 EX. & requires
310.15 B 3>>>
Where the number of current-carrying conductors in a raceway or cable exceeds three, or where single conductors or multiconductor cables are installed without maintaining spacing for a continuous length longer than 600 mm (24 in.) and are not installed in raceways, the allowable ampacity of each conductor shall be reduced as shown in Table 310.15(B)(3)(a).
in part reads>
Where more than two NM cables containing two or
more current-carrying conductors are installed, without
maintaining spacing between the cables, through the same
opening in wood framing that is to be sealed with thermal insulation, caulk, or sealing foam, the allowable ampacity of each conductor shall be adjusted in accordance with Table 31 0.15(B)(3)(a) and the provisions of 310.15(A)(2), Exception, shall not apply.
Most of our installs are required to have fire caulk between floors and/or units. These holes might be 4-5" in length, not 24" , so can i take it the 24" is relevant here?
I ask , because local code '
lore' seems to think otherwise, or perhaps said firecaulk does not work well for mutli-wires?
~S~
