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

Topic Options
Rate This Topic
#77637 - 06/29/01 05:15 PM transformer grounding
dom Offline
Junior Member
Registered: 06/29/01
Posts: 8
When installing a 75kva dry type transformer,
(480delta-120/208wye) If using a water pipe as a ground electrode, does it need to be supplemented by another electrode? Would an equipment ground installed with the primary circuit feeding the transformer qualify as a supplementary ground electrode? thanks
Top
2017 / 2014 NEC & Related Books and Study Guides
#77638 - 06/29/01 05:28 PM Re: transformer grounding
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
Hi dom!

450-10>>>250-20(d)>>>250-30(a)(2)

a start..

Top
#77639 - 06/30/01 04:19 PM Re: transformer grounding
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
dom,
If the transformer feeder originates in the building service equipment, you can install the GEC in with the feeder conducotrs. See the exception in 250-30(a)(3).
Don(resqcapt19)
_________________________
Don(resqcapt19)
Top
#77640 - 07/02/01 05:24 PM Re: transformer grounding
dom Offline
Junior Member
Registered: 06/29/01
Posts: 8
Is there a different requirement for the ground electrode for the main switchgear(250-50) and a ground electrode at a transformer fed from a subpanel in the same system?(250-30(b)(2).- 250-30(a)(3).
thanks
Top

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 46 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Stack, Scotto, Freecrowder, clee512, Jdscott2005

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals