ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
"Esoteric" countries and their wiring practices?
by Texas_Ranger. 04/20/19 07:00 PM
Norwegian power?
by Texas_Ranger. 04/20/19 06:27 PM
Welded Copper Connections
by gfretwell. 04/19/19 04:46 PM
Israel
by annemarie1. 04/18/19 02:35 PM
Water heater calculationsSo when I count calculati
by watersparkfalls. 04/13/19 12:43 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 5 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Code Enforcement Overkill? #77085
04/20/01 10:52 AM
04/20/01 10:52 AM
P
Pete  Offline OP
Junior Member
Joined: Apr 2001
Posts: 1
Built a metal building, with office inside with metal studs. No wood anywhere. Bldg & studs are grounded. Each receptacle has its own grounding lead. Our code enforcement inspector says each junction box must also have a grounding lug. Further, any rigid metal conduit with more than 3 load carrying conductors, conductors must be derated. So, if a 2" conduit has 4 conductors, the wire must be oversized. I'd appreciate comments.

2017 / 2014 NEC & Related Books and Study Guides
Re: Code Enforcement Overkill? #77086
04/20/01 11:03 AM
04/20/01 11:03 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Pete,
250-148(a) requires the EGC to be connected to the box. Table 310-15(b)(2)(a) requires derating of conductors for more than 3 current carrying conductors. Remember that is you are using THHN you can use the 90°C ampacity for derating purposes.
Don(resqcapt19)


Don(resqcapt19)
Re: Code Enforcement Overkill? #77087
04/20/01 06:47 PM
04/20/01 06:47 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Pete,

Don's reply is right on the money. With THHN insulation in a dry location, you usually don't have a derating problem (at least in the smaller sizes) until you get to the 10th conductor.

Tom


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

Featured:

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

 

Member Spotlight
cookcc
cookcc
California ,Long Beach
Posts: 28
Joined: May 2007
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
254,538 Are you busy
190,772 Re: Forum
180,494 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.020s Queries: 14 (0.004s) Memory: 0.9514 MB (Peak: 1.0770 MB) Zlib enabled. Server Time: 2019-04-23 08:24:31 UTC