ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Where is Everyone?
by gfretwell - 04/09/21 01:08 AM
HI gang, long time since I was here...
by gfretwell - 04/09/21 01:02 AM
Lock-down Thread
by gfretwell - 04/06/21 09:30 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 3 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
romex #209231 03/17/13 03:24 PM
Joined: Mar 2005
Posts: 236
watersparkfalls Offline OP
Member
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
Joined: Jul 2004
Posts: 9,575
G
gfretwell Online Content
Member
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
Joined: Jun 2004
Posts: 1,273
T
Tesla Offline
Member
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:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
JoeKP
JoeKP
Berkley, MA
Posts: 144
Joined: March 2008
Show All Member Profiles 
Top Posters(30 Days)
BigB 1
Popular Topics(Views)
277,512 Are you busy
211,221 Re: Forum
198,244 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3