300.4 d

[garrisonm1]

I have a 4 gang nail in carlon box, I had one 14/3 and 2------- 14/2 wires running down the stud to this box, the 2---- 14/2 cables were under one staple. Inspector made me change this because the wires weren't in the center of the stud. I did it with no objections, but i didn't think the 1 1/4 rule applied to this.

 

[Pierre C Belarge]

I figure that the double cable under a staple is so one can conform to 300.4(D).

 

[chris kennedy]

but i didn't think the 1 1/4 rule applied to this.

IMO it does. Here is exhibit 300.3 from the 08 NECHB. Note the top center example.

 

[wbalsam1]

I have a 4 gang nail in carlon box, I had one 14/3 and 2------- 14/2 wires running down the stud to this box, the 2---- 14/2 cables were under one staple. Inspector made me change this because the wires weren't in the center of the stud. I did it with no objections, but i didn't think the 1 1/4 rule applied to this.

The 1 1/4 rule applies to any cable that encroaches into this restricted space. If the space was free, then 2 flat cables can be stapled one over the other but not on edge.

 

[Dennis Alwon]

I have a 4 gang nail in carlon box, I had one 14/3 and 2------- 14/2 wires running down the stud to this box, the 2---- 14/2 cables were under one staple. Inspector made me change this because the wires weren't in the center of the stud. I did it with no objections, but i didn't think the 1 1/4 rule applied to this.

Sure it does that's why they make these

 

[garrisonm1]

Im more of a commercial electrician and we use cj6, for mc cable, thats fine and dandy but what doesn't make too much sense is when you use a deep plastic carlon box thats 3 1/4 inches deep , the back of the box is only a 1/4 inch away from the other side of the wall and the cables have to enter there regardless.

 

[Dennis Alwon]

Im more of a commercial electrician and we use cj6, for mc cable, thats fine and dandy but what doesn't make too much sense is when you use a deep plastic carlon box thats 3 1/4 inches deep , the back of the box is only a 1/4 inch away from the other side of the wall and the cables have to enter there regardless.

I have heard of some inspectors that require nail plates where the wires enter the box. Fortunately that's a non issue around here.

 

[celtic]

Sure it does that's why they make these

...and these:

CJ6

 

[stickboy1375]

Im more of a commercial electrician and we use cj6, for mc cable, thats fine and dandy but what doesn't make too much sense is when you use a deep plastic carlon box thats 3 1/4 inches deep , the back of the box is only a 1/4 inch away from the other side of the wall and the cables have to enter there regardless.

THe manufacture takes care of that proplem....


It is acceptable for the NM Cable to enter the outlet box through its knockout
even though it comes close to the drywall. The NEC is concerned with damage to the cable from nails or screws. Outlet boxes are usually located low to the floor or above counter spaces. Also switches will be found near door opens and a little above the waist. It is unlikely that a picture would be hung in these areas. Section 300.4(B)(2) does state that "if" it is likely that a screw or nail would penetrate the cable than a steel plate needs to be used.