Bending diameter.

[cpal]

just bend it. ever see how bent in half even the old clothe wiring gets in these ole boxes and will still out live us.

merely a guide line.

r

Bending assembled cables or individual conductors presents several issues not just stressing the tensile strength of the conductive material.

Yes the outer covering may become damaged, most have experienced such problems.

Yes the annealed copper and or Aluminum may become weakened, fortunately the harsh bending in such circumstances is usually not repeated. But keep in mind, as the ampacity of the circuit increases so does the constant flexing of the conductive material (theoretically).

I have a deeper concern with the stretching of the individual conductors insulating material and its survivability when subjected to transient stress from over currents.

Don?t forget that if you have a tight radius internal to the bend, the outer dimension will stretch and thin. Dielectric strength is a function of the material used and it?s thickness.

 

[allenwayne]

Jim how do you protect the NM from nails or screws and meet the required 11/4 in of article 300.4(A)(1)

Easy use stacker/standoffs running down the vertical furring then notch the furring where it passes through the top plate and cover with a kick plate.If you wire along the bottom plate just use the stacker/stand offs and run under the vertical furring and kick plate as required.In a block home one might use as much as a box to 1 1/2 boxes of kick plates in one house.

 

[Pierre C Belarge]

Good answer Wayne...You get the "early morning star" today !!!

 

[Dennis Alwon]

Easy use stacker/standoffs running down the vertical furring then notch the furring where it passes through the top plate and cover with a kick plate.If you wire along the bottom plate just use the stacker/stand offs and run under the vertical furring and kick plate as required.In a block home one might use as much as a box to 1 1/2 boxes of kick plates in one house.

I have not seen a stacker that fits on a 3/4" furring and the wire is still not 11/4 from the edge

 

[iwire]

I have not seen a stacker that fits on a 3/4" furring

Thats odd, I use Caddy CJ-6 and they fit on 3/4" stock.

the wire is still not 11/4 from the edge

It's not 1 1/4" from what?

 

[Dennis Alwon]

Thats odd, I use Caddy CJ-6 and they fit on 3/4" stock.
It's not 1 1/4" from what?

Article 300.4 (D)

 

[iwire]

Article 300.4 (D)

Check out this page Caddy CJ-6S and look at the applications for CJ-6S.


I disagree that 300.4(D) is violated when you use these.

 

[Dennis Alwon]

Check out this page Caddy CJ-6S and look at the applications for CJ-6S.


I disagree that 300.4(D) is violated when you use these.

Thank you-- I did check them out before your post but I don't see how they don't violate 300.4(D). It is pretty clearlt worded to me maintain 11/4" it does not give exception for caddy clips.

 

[hillbilly]

I have not seen a stacker that fits on a 3/4" furring and the wire is still not 11/4 from the edge

Which edge?
IMO...The cable doesn't have to be 1 1/4" from the surface of the drywall.
It only has to be 1 1/4" from the outer edge of the wood member it's attached to (or running thru).
Read 300.4(D)
On most homes, the cables will be touching either the inside drywall or the outside sheating by the time the insulators get finished.
The object is to keep the cables at least 1 1/4" away from any (in theory) nail penetration.
The exception is the 2 1/2" nail that the homeowner puts in to mount a shelf, picture frame, etc.
The stackers that I use give about 2" spacing (I've never measured them), and are about 1/2" thick.
The only problem that I have with stackers on furring strips is driving the nails in. It's hard to hit the nails with them that close to the blocks.
Just a opinion.
steve

 

[JohnJ0906]

A CJ6 will easily keep wires 1 1/4" from the edge of the framing member.

 

[Dennis Alwon]

A CJ6 will easily keep wires 1 1/4" from the edge of the framing member.

Very good--- I have always interpreted it to mean 11/4" from the drywall simply because of the 2" screw the ho uses. Thanks for the clarification.

 

[George Stolz]

Very good--- I have always interpreted it to mean 11/4" from the drywall simply because of the 2" screw the ho uses.

Wow, you came around a lot faster than I did.

I haven't read the linked thread, but as I recall, I took a lot of convincing to believe that's what was really written.

Edit to add: Scott posting this handbook picture kinda opened up the crow TV dinner for me, I just reviewed.

 

[Dennis Alwon]

Wow, you came around a lot faster than I did

When you're licked you're licked, you've got to own up to it. I was so sure Bob was wrong--- I should have known better. I read the paragraph again and again and I see what it means now. I will still tell the builders I need at least an 11/2" strip---at least they can get some insulation in there along with my wire being safe. I have seen sheetrocks screws mis by a mile also.
Here's an interesting tidbit. I did a remo on a 13 year old house and noticed the floor had been wet from prior years. I realized the water lines were running up a nearby wall so I got the builder to open up the wall. The carpenters had taken their nail gun and shot no less than 25 nails in the baseboard in a 3' space. About 5 of them went into the pipes. They must have leaked initially but they were still intack nails and all 13 years later. WOW

 

[iwire]

I was so sure Bob was wrong---

Dennis, You should know that I cheat big time.

I have been here long enough to have seen a lot of these questions hashed out before. Many times I have had to eat crow while learning what I thought was not really what it said.

 

[JohnJ0906]

Maybe we should have "Charlie's Rule" at the top of each page.:grin:

 

[hillbilly]

wall. The carpenters had taken their nail gun and shot no less than 25 nails in the baseboard in a 3' space. About 5 of them went into the pipes.


Nailguns are "the debil!".
steve