ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Calling all Non-US members!! (Non-US only)
by HotLine1. 06/13/18 01:50 PM
GE Lighting Recalls LED Tube Lamps
by Admin. 06/12/18 09:32 PM
Ketra Recalls Recessed Downlights
by Admin. 06/12/18 09:17 PM
diazed fuses
by Texas_Ranger. 06/11/18 07:31 AM
soda can fuse from UK, facebook
by wa2ise. 06/06/18 11:02 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 22 guests, and 22 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
romex #209231
03/17/13 03:24 PM
03/17/13 03:24 PM
watersparkfalls  Offline OP
Member
Joined: Mar 2005
Posts: 222
Washington...Not DC
Romex now has to be derated going though holes in wood structures? We are using the 2011 NEC here and I don't see any exceptions in the Washington Administrative Code(which supersedes NEC).

I didn't remember that when taking my continuing education class, but have recently gone to work for another contractor who has contracts for mixed use buildings that are stick built. We are using romex in the dwelling units so I thought I would read up(years since I used romex) and 334.80 directs you back to the conduit fill table.

Am I crazy or misinterpreting?
Thanks,
H20

2017 / 2014 NEC & Related Books and Study Guides
Re: romex [Re: watersparkfalls] #209232
03/17/13 03:49 PM
03/17/13 03:49 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,227
Estero,Fl,usa
NFPA is crazy, you are reading it right.
They are really telling us we need to drill more holes. In reality you still have the practical limit of 9 current carrying conductors (using the 90c column) through one hole so it is not that restrictive.

I am still not sure why I don't have to derate until a nipple is 2 feet long, even if it is packed in foam but I have to derate in a 1.5" penetration with some foam in it.


Greg Fretwell
Re: romex [Re: watersparkfalls] #209238
03/17/13 10:23 PM
03/17/13 10:23 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
The nipple 'exception' is there to cover the ubiquitous 'Romex risers' all over America -- coming vertically up out of a panel. Whatever heat buildup induced by such a short run is cancelled by the 'naked' (sheathless) conductors within the panel.

Due to practice, and economics, such long nipples are not seen elsewhere in Romex installations.

========

NEMA standards limit Romex to 3 conductors plus a bare/ papered grounding/bonding conductor.

The NEC is just doing its part to make sure that no-one attempts to bore (hole saw?) oversized penetrations within wall studs. Yes, more, smaller, penetrations result in a stronger stud/ joist.

Anyone stuffing Romex beyond three cables per... is naughty.


Tesla

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 
Top Posters(30 Days)
twh 5
Popular Topics(Views)
247,613 Are you busy
184,957 Re: Forum
174,197 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.015s Queries: 15 (0.003s) Memory: 0.9518 MB (Peak: 1.0765 MB) Zlib enabled. Server Time: 2018-06-20 13:02:07 UTC