ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
LED retrofit flickers
by rmiell. 01/18/19 08:49 PM
Israel
by Texas_Ranger. 01/14/19 07:12 AM
Free Code class in Maryland 1/16/2019
by Admin. 01/12/19 05:43 PM
Calling all Non-US members!! (Non-US only)
by RODALCO. 01/12/19 02:37 AM
sec cable code conflict
by jake2018. 01/11/19 07:36 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 10 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Code Enforcement Overkill? #77085
04/20/01 09:52 AM
04/20/01 09:52 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 10:03 AM
04/20/01 10:03 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 05:47 PM
04/20/01 05:47 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
MarkC10
MarkC10
CA, Inland Empire
Posts: 43
Joined: September 2013
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 4
Popular Topics(Views)
252,821 Are you busy
189,617 Re: Forum
179,281 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.9510 MB (Peak: 1.0766 MB) Zlib enabled. Server Time: 2019-01-23 03:18:04 UTC