Re: [TCML] NST earth leakage signalling sensor & output question.

[Grant <grants.mailbox@xxxxxxxxx>]

Hi Jacob,

Your 4KV NST will work just fine for a very low power TC and the
'signalling sensor' shouldn't cause a problem as you will not be
grounding the NST to the mains earth. The earth terminal on the input
side should be connected directly to the NST's casing (test as a short
circuit with a multimeter) in which case you could use that as one of
your HT leads on the TC side of the circuit. Alternatively just scrape
some paint off the casing where one of the screws hold the casing
together and attach the HT lead there with a lug.

Hope this helps
Grant

On 9 January 2013 23:09, Jacob Karlström <94jac12@xxxxxxxxx> wrote:
> Hello,
>
> I finally found a description about the NST I will be using in my TC. This
> is a quote from the description: "One end of the secondary winding has been
> earthed. The transformer's protection is class I and its enclosure class is
> IP00. It has been equipped with a signalling sensor for a earth leakage
> protection unit". Upon seeing reading this I became it bit worried about
> the 'signalling sensor', I'm wondering what its purpose is in the NST. I'm
> hoping it does not mean that the NST has a GFI. I opened the case slightly
> in one end and saw that the connector with the ground symbol (link to image
> is further down) is connected to a very thin wire while the inputs N and
> PPL were connected with wires of a larger diameter. So I'm guessing the
> connector with the ground symbol is, in some way, connected  to the
> signalling sensor. Should this signalling sensor pose a problem when using
> this NST for a TC?
>
> I'm also wondering how I best can connect a wire to the enclosure. On one
> of the pictures you can see traces of some sort of wire as well as a spot
> where the case has been scraped to reveal the metal; do you have any advice
> on how to fasten a wire there?
>
> Regards,
> Jacob Karlström
>
> Link to images:
> http://imgur.com/a/h9j1p
>
> Link to full description of the NST:
> http://web.archive.org/web/20010424214041/http://www.neoncomp.fi/english/se-tyyppi.htm
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