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Re: Secondary Circuit Ground Fault Protection
- To: tesla@pupman.com
- Subject: Re: Secondary Circuit Ground Fault Protection
- From: "Tesla list" <tesla@pupman.com>
- Date: Mon, 21 Apr 2003 16:56:27 -0600
- In-Reply-To: <20030421200915.8012.qmail@web20306.mail.yahoo.com>
- Resent-Date: Mon, 21 Apr 2003 17:48:39 -0600
- Resent-From: tesla@pupman.com
- Resent-Message-ID: <KSbHx.A.ySE.qMIp-@poodle>
- Resent-Sender: tesla-request@pupman.com
Original poster: "Terry Fritz" <teslalist@qwest.net>
Hi Jeremy,
If you have one of these new transformers, please try it!! The goofy stuff
can be easily defeated* but I am not sure anyone has tried them straight
yet. It would be fascinating to know if they still will work as is.
*Just take the cover off and you will get the idea ;-))
Cheers,
Terry
At 01:09 PM 4/21/2003 -0700, you wrote:
>Has anyone used an NST that has a secondary circuit
>ground fault protection built into it?
>
>New Allanson transformers have apparantly have these
>built in, and as far as I can guess they detect
>shorts to ground on the secondary side and cut
>the power if that happens. (Just like the outlets
>in bathrooms and kitchens.)
>
>I was wondering which "ground" these circuit
>protectors
>are referenced to -- the AC mains ground or the
>NST ground reference (secondary center tap)
>
>I don't connect the AC mains ground (ie green/bare
>wire) to my NST's but I do install saftey gaps
>between the secondary center tap ("NST ground" - zero
>voltage reference) and hot secondary connections.
>(Part of the Terry RC filter)
>
>I am concerned that arcing here (ie spark gap
>fails/cap goes overvoltage) will trip the ground fault
>protector
>and shut the off the power. That wouldn't be a bad
>thing in theory, but I do expect the occasional
>safety gap spark during tuning and adjustment.-- is
>this GFCI going to be a pain?