The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 119 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#78637 - 10/09/01 04:49 PM Cable bending
tmon Offline

Registered: 07/05/01
Posts: 29
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

2014 / 2011 NEC & Related Books and Study Guides
#78638 - 10/09/01 05:11 PM Re: Cable bending
Bill Addiss Offline

Registered: 10/07/00
Posts: 4196
Loc: NY, USA

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


#78639 - 10/09/01 07:19 PM Re: Cable bending
sparky66wv Offline

Registered: 11/17/00
Posts: 2334
Loc: West Virginia
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?

#78640 - 10/10/01 05:27 AM Re: Cable bending
Redsy Offline

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
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.

#78641 - 10/11/01 05:14 AM Re: Cable bending
WARREN1 Offline

Registered: 05/09/01
Posts: 184
Loc: Greenville, SC, USA
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.

#78642 - 10/11/01 05:20 AM Re: Cable bending
resqcapt19 Offline

Registered: 11/10/00
Posts: 2209
Loc: IL
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.


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals