Its quite obvious that something in that circuit is underrated for the
current being drawn, and once some plastic bit starts to melt you get poor
and poorer contact, even arcing in the end, completely trashing the socket.
If a plug is getting warm that is a good bit of diagnostic help. The pin
that is getting hot is obviously doing so due to underrated connections.
Look in the plug or whatever it is that plugs into the socket which gets
damaged. it is entirely possible that the body of the plug is unaffected if
its a higher melting point plastic.
I had an issue like this with one of those so called plug in mechanical
timers, the one where you put pins in holes. When I opened it up the short
bit of brass from the live pin to the switch had been riveted to either end
and this had oxidised and heated up the pin as a result. Load of rubbish.
I only had a 3K fan heater on it!
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Archibald Tarquin Blenkinsopp" wrote in
message ...
On Tue, 15 May 2018 03:14:02 GMT, Lea Goldberg
m wrote:

.so,for the first 2 years,my comet kiln worked perfectly...then the
socket
burnt out,replaced it(always ised a professional electrician)thos
time,socket
switches got hardrr and harder to switch on,then the socket stopped
working
again,replaced the whole unit...now its happened again...the socket is
about
20 ft via armoured cable to the house,the kiln room isnt damp...the kilns
fine,but the plug gets a bit hot(when it worked)the electrician seems to
be
baffled...'must be your kiln'...but i know nothing about electrics so cant
argue the toss!can ANYONE help...its driving me mad....

Well if it baffled your professional electrician, there's your
problem.

What subnormal idiot thought that a damp kiln room could have any
bearing on socket condition/ temperature 20 feet away?

AB