On 20/12/15 11:12, Dave Liquorice wrote:
On Sat, 19 Dec 2015 07:16:44 +0000, Tim Watts wrote:

Yeah - I'll get a new switch of the same make (for same terminal
layout) next time I'm up TLC in a week or two.

Hum, a plain switch running hot when the associated MCB/RCBO is
cold.
Bear in mind that MCBs have a thermal part...I think I'd be down
the
shops tommorow or not use what ever it is until the switch has
been
replaced.

Well, even I'm not going to panic quite that much This is only used
when people are around.

But you still did when your mate came round and commented. B-)

Yes - sometimes it helps when some else agrees on the spot
My sense of temperature by feel is not a well calibrated instrument - it
helps to have a second opinion.

Why is terminal layout so critical?

There's not much slack...

OK 10 mm2 isn't the most bendy stuff but the switch will be on a
47 mm
deep box won't it to give room.


Tricky I know to leave slack with heavy cables, shallow boxes don't
help.


Yes it is - and I used a 47mm box (of course - I'm not that stupid), but
I did not leave much slack. So I will move the new box back a bit and
replace the short run to the heater. That'll give me more room to get to
the screws at the wall end.

I slapped the thing in a hurry some years ago - none of it was
optimal... Will do it a bit better this time.