ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
twh 10
Recent Posts
Windows 10, who's upgraded?
by ElectricianBud. 05/27/17 11:02 AM
How do you find a good employee?
by ElectricianBud. 05/27/17 10:58 AM
Recall notice: Bosch Solar panels
by ElectricianBud. 05/27/17 10:53 AM
Correct rotation, wrong sequence
by Potseal. 05/27/17 12:15 AM
Dryer, Range grounding from "Main" panel
by sparkync. 05/25/17 05:49 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
236,959 Are you busy
171,969 Re: Forum
164,846 Need opinion
Who's Online Now
0 registered members (), 70 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#77637 - 06/29/01 08:15 PM transformer grounding  
dom  Offline
Junior Member
Joined: Jun 2001
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


2017 / 2014 NEC & Related Books and Study Guides

#77638 - 06/29/01 08:28 PM Re: transformer grounding  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,308
Hi dom!

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

a start..

[Linked Image]


#77639 - 06/30/01 07:19 PM Re: transformer grounding  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
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)

#77640 - 07/02/01 08:24 PM Re: transformer grounding  
dom  Offline
Junior Member
Joined: Jun 2001
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



Member Spotlight
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
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: 0.012s Queries: 14 (0.003s) Memory: 0.7588 MB (Peak: 0.8898 MB) Zlib enabled. Server Time: 2017-05-29 04:01:25 UTC