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Joined: Jul 2002
Posts: 103
J
jes Offline OP
Member
Two questions re. 300.4 and 550-15(C) (and similar)
First, for cables passing through wood members and without the required 1 1/4" setback: Has anyone experienced problems with sheathing fasteners (power driven staples or nails) missing the studs (and the protective plates for NM cable) and penetrating the cables?? As I read the NEC the plates DO NOT have to extend beyond the edges of the studs.

Second, 300.4(D) for cables PARALLEL to the studs and without the required 1 1/4" setback there appears to be an additional requirement for plate protection: If protection extending beyond the stud edge is required in this case where misdriven fasteners can impact the cable why not at drilled holes or notches?? What am I missing??

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Joined: Dec 2003
Posts: 751
E
Member
You have missed nothing. The NEC has missed it. It seems as if someone needs to raise this omission with a code submittal.


Earl
Joined: Jan 2003
Posts: 4,391
I
Moderator
Jes If you are having problems with this happening to your cables go ahead and add additional protection nothing says you have to wait for the NEC. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Joined: Oct 2000
Posts: 2,749
Member
Hi Jes:

I was reminded of a proposal I sent in early in the 1990's.

I asked for the code to be changed to add 1/4" on each side of the "Kickplate" and CMP 3 said that was intended with the words I have bolded:

Quote
300.4(A)(1) Bored Holes.

...... Where this distance cannot be maintained, the cable or raceway shall be protected from penetration by screws or nails by a steel plate or bushing, at least 1.6 mm ( in.) thick, and of appropriate length and width installed to cover the area of the wiring.

This is already included according to the panel, but now we have all new members and a new Chairman who may agree with replacing those vague and undefined words really not permitted by the style manual anyway.


Joe Tedesco, NEC Consultant
Joined: Dec 2003
Posts: 751
E
Member
hear, hear


Earl
Joined: Jul 2004
Posts: 9,718
Likes: 11
G
Member
How do you all feel about the standoffs they use to hold Romex 1.25" to the side of a furring strip on a 3/4" furred masonry wall void?
The standard practice used to be to sleeve the Romex in EMT where it was unable to be 1.25" back. Now they are just using the plastic standoff to get a horizintal separation.
I can understand that the rocker will probably hit the furring +/- 1.25" but a homeowner hanging pictures might just keep poking holes until they hit something solid.


Greg Fretwell

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