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Delta ground detectors #67572
07/10/06 11:21 AM
07/10/06 11:21 AM
B
bman  Offline OP
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

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

Member
Joined: Dec 2000
Posts: 4,266
Fullerton, CA USA
Go To Erickson by clicking here
Then to the "ground detectors" button on the left

Re: Delta ground detectors #67574
07/10/06 09:36 PM
07/10/06 09:36 PM
H
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.


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