ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 17
Recent Posts
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
Dining room plugs
by watersparkfalls. 03/21/17 10:31 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,488 Are you busy
166,198 Re: Forum
160,649 Need opinion
Who's Online Now
0 registered members (), 39 guests, and 13 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#85462 - 07/07/03 04:28 PM Engineering Supervision  
mountainman  Offline
Member
Joined: Jan 2002
Posts: 54
Richmond Va. U.S.A.
Article 310-15(b) of the 1996 NEC Engineering supervision, an engineer states that with his calculations he can use 4-4/0 conductors on a 4 wire wye circuit with a 225 ampere over currant protection. Would this override 310-15 Note #10(c). He has 4/0 copper in EMT in an electric room. And would you rquire the engineer to show his calculations? Thanks Joe


2017 / 2014 NEC & Related Books and Study Guides

#85463 - 07/07/03 05:10 PM Re: Engineering Supervision  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
As the AHJ, an engineer has the responsibility to adequately demonstrate to you that the cable installation conforms to article 310. Paper calculations submitted to you containing a suitable explanation and his PE stamp may adequately support his position to your satisfaction.




[This message has been edited by Bjarney (edited 07-08-2003).]


#85464 - 07/07/03 06:50 PM Re: Engineering Supervision  
George  Offline
Member
Joined: Feb 2002
Posts: 375
mountainman ---

If you are inspecting and is is not building according to the perscriptive code, you should ask for his calculations.

You need to have someone who can tell if the computations are correct or not.


#85465 - 07/07/03 09:12 PM Re: Engineering Supervision  
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
Absolutely have him/her show calculations and sign/seal them.
But, what am I missing? Table 310-16 shows 4/0 CU in the 75 degree column to have an ampacity of 230A. What is the issue with 225A CB serving a 230A conductor? Is it 100% rated breaker or something else? Maybe aluminum?

[This message has been edited by Ron (edited 07-07-2003).]


Ron


Member Spotlight
mersadrad
mersadrad
Montreal, Quebec, Canada
Posts: 28
Joined: March 2011
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.016s Queries: 14 (0.003s) Memory: 0.7578 MB (Peak: 0.8916 MB) Zlib enabled. Server Time: 2017-03-26 10:57:47 UTC