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Cable bending #78637 10/09/01 07:49 PM
Joined: Jul 2001
Posts: 29
T
tmon Offline OP
Member
Can anyone direct me to a chart or table that gives some direction on or about low voltage (600v or less) cable bending radii? Thanks, Tom

2017 / 2014 NEC & Related Books and Study Guides
Re: Cable bending #78638 10/09/01 08:11 PM
Joined: Oct 2000
Posts: 3,961
Bill Addiss Offline
Member
Tom,

I don't have a list or chart, but you can look in the NEC under each cable type if that helps.

AC - 333-8 5x diameter
MC - 334-11(a)(b)(c)- depends on type
NM - 336-16 5x diameter
SE/USE - 338-6 5x diameter
etc.

Bill


Bill
Re: Cable bending #78639 10/09/01 10:19 PM
Joined: Nov 2000
Posts: 2,236
sparky66wv Offline
Member
This reminds me of a Q that is related...

Let's take #12-2-G NM Cable (Romex) for instance...

336-16 states that bends in NM Cable shall have a radius 5 times the diameter of the cable.

With 12-2-G being flat does this translate to a bending radius of 2-1/2" (5 x 1/2" wide)? The same circumference as a 5" hole saw?!?!?

I don't "square off" my corners, but I don't think I leave quite that large of a "sweep" in the cable around corners either...

Am I reading to much into this again?


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Re: Cable bending #78640 10/10/01 08:27 AM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline
Member
sparky66wv,
I wouldn't sweat it. What about the conductors connected to the devices in the boxes. They mostly all would violate the radii. Although this is may not technically be "cable". I don't square off corners, either, and am conscious of the radii, but most installations on the side of a stud which goes through a bored hole violate this.

Re: Cable bending #78641 10/11/01 08:14 AM
Joined: May 2001
Posts: 176
W
WARREN1 Offline
Member
A curious question concerning Romex. If you had to run the Romex in conduit, how would you determine the conduit fill? Is the area given on the box (or whatever) when it is purchased? The area can be calculated, but??
I realize Romex is usually not run in conduit, but there may be instances where it could be used.

Re: Cable bending #78642 10/11/01 08:20 AM
Joined: Nov 2000
Posts: 2,148
R
resqcapt19 Offline
Member
Warren,
You have to do your own area calculations for romex using the major dimension for the calculations. See note 9 to Table 1 in Chapter 9.
Don(resqcapt19)


Don(resqcapt19)

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