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Post subject: Isolation Transformer grounding.
Posted: Mon May 13, 2019 10:44 am
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Aspiring Musician
Aspiring Musician

Joined: Thu Aug 07, 2014 3:25 pm
Posts: 869
So I'm rummaging through auction leftovers this morning. First score was a box full of CDs. Then an isolation transformer. Everything was a buck a box, so we were grabbing and not looking much.
I got home to find the CD cases were mostly empty, but did score a few good ones. JJ Cale, Ventures, a Jimmy Fallon, and David Allan Coe. Didn't know he was so politically incorrect...
The Tranny turned out to be a Triad N-57MG 500VA isolation transformer. It just needed cord work and I noticed the soldering had broken loose from the lead to the secondary. Easy Fix.
But then I saw the ground lug on the output had been disconnected too.
I haven't used an isolation tranny on the bench before, only a variac, which is definitely not isolated.
Would it make sense to leave it disconnected for bench use? Mostly I see using it for switching power supply troubleshooting so I don't fry my scope.


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Fender Play April 2019
Post subject: Re: Isolation Transformer grounding.
Posted: Mon May 13, 2019 10:50 pm
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Rock Star
Rock Star
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Joined: Sat Jul 03, 2010 2:18 pm
Posts: 6455
Nice score on those JJ Cale CDs. I've been scrounging around looking for used LPs.

I think it's okay not to ground the isolation transformer. Prolly there, in case the windings somehow contact the transformer's chassis. I have several Topaz Ultra-Isolation transformers. Only a couple have chassis ground wired to the green line.


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