ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Extension cords
by Texas_Ranger. 09/25/18 04:37 AM
220/230/240V 60Hz Systems
by gfretwell. 09/23/18 02:50 PM
Inspection camera help
by petey_c. 09/22/18 07:52 AM
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 38 guests, and 22 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
366.7 #96350
11/20/05 04:02 PM
11/20/05 04:02 PM
N
ngoody24  Offline OP
Member
Joined: Sep 2005
Posts: 33
pace,FL, United States
Hi guys i have a question for yall.
366.7(a) says when you have 30 or less current carring conductors the correction factors specified in 310.15(b)(2)(a) shall not apply.
(b)however a nonmetallic auxiliary gutter the derating factors specified in 310.15(b)(2)(a) shall be applicable.

Is this because one is plastic and one is metal. one has a chance to melt and one doesnt? any help would be great. thanks

2017 / 2014 NEC & Related Books and Study Guides
Re: 366.7 #96351
11/20/05 05:07 PM
11/20/05 05:07 PM
E
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
A quote from Mark Ode of NFPA in Electrical Contractor Magazine from 2000: "The metal wireway dissipates heat better than the nonmetallic wireway, which is likely to be affected by excessive heat from the conductors."

I guess your assumption about maybe melting the plastic gutter was correct.


Earl

Featured:

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

 

Member Spotlight
HappyElectrician
HappyElectrician
Penn USA
Posts: 31
Joined: December 2011
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
BigB 4
Popular Topics(Views)
249,452 Are you busy
187,374 Re: Forum
176,710 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.017s Queries: 14 (0.004s) Memory: 0.9422 MB (Peak: 1.0617 MB) Zlib enabled. Server Time: 2018-09-25 13:04:21 UTC