On Wed, 09 Sep 2009 18:31:34 +0100, "Dave Plowman (News)"
wrote:

In article ,
John Rumm wrote:
Dave Plowman (News) wrote:
After much bollock scratching I've manage to upload a few pics. Please
hurl the usual derision.

Ah, that's better ;-)

Now reading between the lines, and comparing your pictures to those on
the TLC web site; I would guess that your pots are designed to be used
only with a gland since they don't include any explicit way of making an
earth connection and one would have to rely on the mechanical clamping
of the gland to a conductive box, or the use of a piranha style backnut
to get the earth connection (as with SWA). Whereas the ones pictured on
the TLC site:

http://www.tlc-direct.co.uk/Images/P...3/MIRPS2L1.JPG

included soldered on tails for the purpose...

Yes. Never actually used those but knew they existed.

My assumption was that most here would likely use pyro in something like
a conservatory etc with bare brick walls. In which case switches and
sockets etc would be steel surface mount. Or BESA box fittings. But I
can't see anything against soldering an earth wire to the outside of a pot
- before fitting it - or using a clamp on the sheath - if the termination
is used elsewhere.

Solder alone on a surface does not make a sound mechanical joint, it can
easily be torn off, which is why the ones in the TLC pic are (or appear
to be) soldered into holes drilled through the pot. Would be even
stronger if the ends were splayed out in a countersunk hole where we can
see the solder.

Phil