ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 13
Admin 8
Recent Posts
OD of Alum and Copper
by gfretwell. 08/22/17 07:04 PM
Grid problem??
by annemarie1. 08/21/17 01:10 PM
Bathroom electrical
by doc. 08/19/17 06:53 AM
electircal ageing test on IPC
by SIAME. 08/15/17 02:43 AM
electrical aging test on IPC
by gfretwell. 08/15/17 12:27 AM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,106 Are you busy
175,721 Re: Forum
167,931 Need opinion
Who's Online Now
0 registered members (), 80 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#213394 - 04/21/14 03:40 PM 250.30(B) 3 & 250.30 (C)  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 824
Michigan
Outdoor transformer Customer owned 13.8 Pri.
480/277 Secondary. Bond at Transformer as Required 250.30 (C)
sized by 250.66. 3 phases from Transformer Plus Ground to ist OCP. Can it be Bare Conductors (Parallel) & Must be sized by 250.66 as it's before OCP.
250.30 (B) 3.
Phase Conductors 6 sets of 750's .
750 x6 = 4500 x 12.5 % =5625.
Grounding conductor must be 600 mcm each conduit.
Your imput ?


2017 / 2014 NEC & Related Books and Study Guides

#213418 - 04/25/14 02:39 PM Re: 250.30(B) 3 & 250.30 (C) [Re: Yoopersup]  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 824
Michigan
Questions are incase I didn't state them correctly?
Can a bare SSBJ be installed between the XO at the secondary of the transformer to the Switchgear with the phase conductors?? (there is no Neutral just 3 phases & SSBJ.

Second: system bonding jumper must be sized by 250.66????

Yoopers UP
see above post for details




Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Featured:

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

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.009s Queries: 15 (0.002s) Memory: 0.7431 MB (Peak: 0.8611 MB) Zlib enabled. Server Time: 2017-08-23 02:30:19 UTC