Three new home concerns

[ActionDave]

6:50 am or there abouts on my local station....

I haven't heard that guy since the 90's. Used to crack me up.

 

[north star]

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"I have to say that it can be a judgement call, but just how many cables can
we pull through the same set of holes bored in the framing before we decide it is
too hard to consider any spacing being adequately maintained ?

Years ago the place I worked for when we did new houses we usually drilled about
a 2.5 inch hole and ran however many cables we needed in it, seldom ever needed a
second set of holes.........Now I still kind of think the load diversity factor of most
dwelling circuits still doesn't contribute to excessive heating, but that is a different
issue....................I now drill only 3/4 - 1 inch holes and usually several sets when
close to the panel and only install 9 or less current carrying conductors in whatever
combination of cables end up being installed in each hole..........If you put many more
cables then that in there, how do you ensure the ones in the center of the group
have adequate spacing around them to dissipate heat ?............The outer ones may not
have enough spacing but at least have more surface exposure to free air."

Refer to Section E3605.4.4, in the `06 IRC:


"In A Single Family Dwelling [ SFD ]:

From the `06 IRC, Section E3605.4.4 - Conductors of Type NM cable:
Conductors in NM cable assemblies shall be rated at 90?C (194?F).....Types
NM, NMC, and NMS cable identified by the markings NM-B, NMC-B, and
NMS-B meet this requirement..........The ampacity of Types NM, NMC, and
NMS cable shall be at 60?C (140?F) conductors and shall comply with
Section E3605.1 and Table E3605.5.3.........The 90?C (194?F) rating shall
be permitted to be used for ampacity correction and adjustment purposes
provided that the final corrected or adjusted ampacity does not exceed
that for a 60?C (140?F) rated conductor.................Where more than two
NM cables containing two or more current-carrying conductors are
bundled together and pass through wood framing that is to be fire- ,
or draft-stopped using thermal insulation or sealing foam, the allowable
ampacity of each conductor shall be adjusted in accordance with
Table E3605.3."



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[kwired]

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Refer to Section E3605.4.4, in the `06 IRC:


"In A Single Family Dwelling [ SFD ]:

From the `06 IRC, Section E3605.4.4 - Conductors of Type NM cable:
Conductors in NM cable assemblies shall be rated at 90?C (194?F).....Types
NM, NMC, and NMS cable identified by the markings NM-B, NMC-B, and
NMS-B meet this requirement..........The ampacity of Types NM, NMC, and
NMS cable shall be at 60?C (140?F) conductors and shall comply with
Section E3605.1 and Table E3605.5.3.........The 90?C (194?F) rating shall
be permitted to be used for ampacity correction and adjustment purposes
provided that the final corrected or adjusted ampacity does not exceed
that for a 60?C (140?F) rated conductor.................Where more than two
NM cables containing two or more current-carrying conductors are
bundled together and pass through wood framing that is to be fire- ,
or draft-stopped using thermal insulation or sealing foam, the allowable
ampacity of each conductor shall be adjusted in accordance with
Table E3605.3.





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Understood, and NEC has about the same requirement. But the picture in the OP does not involve fire or draft stopping in the holes.

 

[north star]

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"Understood, and NEC has about the same requirement. But the picture in the OP does not involve fire or draft stopping in the holes."

Good point ! :happyyes:

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