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

ECN Shout Chat
Top Posters(30 Days)
Admin 16
Recent Posts
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
TRUE POWER
by jraef. 03/21/17 09:13 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,349 Are you busy
166,082 Re: Forum
160,546 Need opinion
Who's Online Now
0 registered members (), 80 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#67572 - 07/10/06 11:21 AM Delta ground detectors  
bman  Offline
Member
Joined: Jul 2006
Posts: 20
or
Have installed a back fed 120V/208Vy-480V delta Xfmr to supply a 480V steam generator (ungrounded). 250.21(4) states I must install ground detectors on this system. Any one know of a source for gound detectors? I am thinking there must be a set up something like a panel surge arrestor
that I can attach at each end of the system?
Haven't been able to google anything up.
Thnx Bman


Work Gear for Electricians and the Trades

#67573 - 07/10/06 07:28 PM Re: Delta ground detectors  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,259
Fullerton, CA USA
Go To Erickson by clicking here
Then to the "ground detectors" button on the left


#67574 - 07/10/06 09:36 PM Re: Delta ground detectors  
hypress  Offline
Member
Joined: Jul 2004
Posts: 129
Charleston WV
The cheap and simple way is with 25 watt 250 volt lamps.
Take 6 lamps and pair them up in groups of 2.
Series each group then attach one group to each phase . On the other side of the groups
tie those wires together and take them to a normally closed pushbutton. That will act as a lamp test switch ,the other side of the switch connect to ground .

When every thing is normal all 6 lights will glow dim .When there is a ground the grounded phase lamps will go out or very dim and the other lamps will get bright. It is not hitech but it works very well.



Member Spotlight
Trumpy
Trumpy
SI,New Zealand
Posts: 8,211
Joined: July 2002
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: 0.7496 MB (Peak: 0.8733 MB) Zlib enabled. Server Time: 2017-03-24 21:47:03 UTC