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#67572 - 07/10/06 08:21 AM Delta ground detectors
bman Offline
Member
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
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#67573 - 07/10/06 04:28 PM Re: Delta ground detectors
electure Offline


Member
Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
Go To Erickson by clicking here
Then to the "ground detectors" button on the left
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#67574 - 07/10/06 06:36 PM Re: Delta ground detectors
hypress Offline
Member
Registered: 07/20/04
Posts: 129
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.
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