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NM Cable At Right Angles To Framing Members #79677 01/11/02 10:27 PM
Joined: May 2001
Posts: 129
frodo Offline OP
are you ever allowed to run NM Cable #8 and smaller at a right angle to cieling joist in unfinshed basements, finished basements or unfinished cielings? what about floor joist in crawl spaces or attics without a doorway?

thanks for any replies



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Re: NM Cable At Right Angles To Framing Members #79678 01/12/02 01:02 AM
Joined: Nov 2000
Posts: 2,236
sparky66wv Offline
336-6(c) and (d) reverts to 333-12 (which means it falls under the same rules as AC cables there).

In short, you gotta bore holes for anything smaller then two #6's or 3 #8's in a cable in unfinished basements, attics must be either bored or protected with running boards if they're within 7 feet of a permanent ladder or stairs, and 6 feet from a scuttle hole.

300-4(d) also gives further instructions involving the 1-1/4" rule for bored holes.

Hope this makes it clear (and I hope I got it right!). Uh... check me guys...

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Re: NM Cable At Right Angles To Framing Members #79679 01/12/02 01:44 AM
Joined: Dec 2001
Posts: 270
Elzappr Offline
Most of it is right. It IS ok to route the small cables across bottoms of basement joists if you staple them to running boards --334.15(C). Don't want people to be pulling on or damaging the flimsy cable when stuffing things in the attic, or use the cables as clothes hangers in basements! I don't see any definition for "unfinished basement" and don't know if 334.15(C) applies to crawl spaces.

[This message has been edited by Elzappr (edited 01-12-2002).]

Re: NM Cable At Right Angles To Framing Members #79680 01/12/02 09:46 AM
Joined: May 2001
Posts: 129
frodo Offline OP
thats what i thought but i have to admit that i have seen a lot of homes that do not meet these requirements.

as far as finished basements goes, i have a client who wants to install a ceiling in his partially finished basement. they are apparently turning the place into an apartment for JUNIOR.

there are already several 12/2 and 14/2 strung all over the face of the floor joist at right angles.

since the client indicated that the cieling is going to be finished out then i am wondering if it is still required to bore holes?

as far as attics go, usually home runs and short jumpers are run across the top of cieling joist at angles to save time etc., but it seems to violate the 7 foot rule...i suppose as long as the cables are a minimum of 6 feet from the scuttle hole then that is acceptable...

given a partially finished attic that has been floored, and has a doorway or a perm. stairway, then 7 foot would seem to be the minimum.

so if you have a finished or partially finished attic then NO cables should be pulled accross the tops of cielng joist at all, because you can not assume that the homeowner will not expand or exceed the initial storage space by putting to much junk up there...

i am probably guilty of violating this rule a time or two.

it appears that the rule is for protection of the cable and not for safety.

thanks for the input



Re: NM Cable At Right Angles To Framing Members #79681 01/12/02 12:17 PM
Joined: Dec 2001
Posts: 270
Elzappr Offline
Here in Oregon it seems every house is truss roofed and no body would want to drill the bottom 2X4 member of the trusses. I guess the best thing would be to route the home runs in some orderly fashion so that future remodeling would have an option to somehow box in the home run area.
Just one further comment, Frodo, cable safety is personnel safety. Course, if we had AFCI's on all circuits we wouldn't have to worry about burning the house down, would we? [Linked Image]

[This message has been edited by Elzappr (edited 01-12-2002).]


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