The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Son of Sparky
by HotLine1
Yesterday at 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
230 or 345 kV transmission lines?
by annemarie1
10/12/16 01:23 PM
Is this a fix or just a bandaid?
by gfretwell
10/10/16 06:49 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
HotLine1 6
renosteinke 6
ghost307 5
sparky 4
Who's Online
1 registered (gfretwell), 244 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#67572 - 07/10/06 08:21 AM Delta ground detectors
bman Offline

Registered: 07/07/06
Posts: 20
Loc: 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

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#67573 - 07/10/06 04:28 PM Re: Delta ground detectors
electure Offline


Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
Go To Erickson by clicking here
Then to the "ground detectors" button on the left

#67574 - 07/10/06 06:36 PM Re: Delta ground detectors
hypress Offline

Registered: 07/20/04
Posts: 132
Loc: 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.


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