[TCML] Mains Suppression Filter

[Michael Gray <graymp89@xxxxxxxxx>]

Hi all

Unfortunately, I've been forced to put the construction of my coil on hold
for a couple of months as I've had very little time to myself - but I'm
back to it now, and it's nearing completion. Really excited!

I'm not sure if it's common practice to implement a suppression filter to
protect ones mains circuitry, but I would very much like to do so. The more
isolated my TC project is from the rest of the house, the better. So I've
had a look around for some devices that would do the job for me, and I've
come across this one from Schaffner:

http://docs-europe.electrocomponents.com/webdocs/0e23/0900766b80e23106.pdf

The one in particular I'm looking at is the 10A version, with surge
suppression. But I could use some help understanding the datasheet!

Having looked at the attenuation vs frequency graph for the 10A unit, I can
see that the filter achieves its 3dB cut-off somewhere between 10kHz and
20kHz, for the "A" configuration - and it gives:

A = 50Ohm/50Ohm sym

I'm not understanding that completely - should I be looking at the "A" line
or another?

Secondly, I like this device as it has surge protection built in too, and
it gives the following info for it:

Surge pulse protection: 2kV

Is this a suitable rating for overvoltage? My understanding is this - I
already have a Terry filter with the safety spark gaps in place to protect
my NST, so I can more or less assume that no HV is going to make it back
into my NST and hence the only way for voltage spikes to appear on the
input side of the NST (i.e. mains side) is if the coil sparks out and
strikes something on the input side (or possibly through magnetic induction
on input wiring?). If this is the case, then the 2kV rating would be more
than adequate. So I'd appreciate a sanity check on this, as I have more
than likely missed something (it's quite late here in the UK).

Anyway I'd appreciate your thoughts and feedback on everything I've
mentioned.

Many thanks!
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