ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
Green House wiring
by gfretwell. 07/20/17 12:39 AM
1913 American Electrician's Handbook
by Admin. 07/19/17 08:41 PM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
210.70 / Wall Switch / When adopted?
by HotLine1. 07/16/17 11:25 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,163 Are you busy
174,542 Re: Forum
166,984 Need opinion
Who's Online Now
0 registered members (), 55 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#84105 - 03/10/03 02:54 PM Bundled wiring?  
Reel-Break  Offline
Member
Joined: Apr 2002
Posts: 178
nc
Can someone please give some advise on this.Running wiring through holes in a web beam floor joist.I don`t have them packed but I have 4- 14/2 cables in some and 12/2 and 10/3 in others and ahj says I`m bundling must derate.I thought they had to be tied or taped. Thanks


2017 / 2014 NEC & Related Books and Study Guides

#84106 - 03/10/03 05:00 PM Re: Bundled wiring?  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,311
'bundeling' is somewhat ill-defined, 310.15(b)(2)ex 5 can be used if your running MC or AC.

Table 310.15(b)(2)(a) w/310.16's ability to start @ the 90 deg collum should grant you some leverage


#84107 - 03/10/03 06:03 PM Re: Bundled wiring?  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
If all you have is four 2 wire cables, there is no problem. You will be derating to 70% of the 90 degree column.

The trouble starts when you hit the fifth 2 wire cable in the bundle which requires a 50% derating.

As for the 3 wire cables, if this is a single phase system, the neutral is not considered a current carrying conductor and if this is a 3 way switch cable, only 2 wires are current carrying.


Few things are harder to put up with than the annoyance of a good example.

#84108 - 03/10/03 07:46 PM Re: Bundled wiring?  
George  Offline
Member
Joined: Feb 2002
Posts: 375
Only if the joist holes are longer than 2' does the derating apply.

It is between you and your inspector as to what you will agree on.



Member Spotlight
waymag
waymag
dallas, texas, USA
Posts: 67
Joined: January 2002
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.002s) Memory: 0.7594 MB (Peak: 0.8913 MB) Zlib enabled. Server Time: 2017-07-20 12:26:20 UTC