This week I had a rather salutary lesson with my burnout kiln. All
is well but it could have been much worse. My kiln is in a shed that
I share with my partner and her pottery kiln. Her kiln draws 19 amps
from a 240 volt circuit, We have a 40 amp sub main from the main
switchboard to the shed and both kilns are connected to a sub board
in the shed with a 20 amp combined ELCB and overload protector. The
pottery kiln is directly wired into the board while the burnout kiln
was connected through a 15 amp power outlet.
Obviously if we ever tried to run both kilns the circuit breaker
would immediately trip.
Last week Ii did a burnout and when I shut down everything I noticed
that the power plug had overheated and started to melt despite
running within specification for the plug and socket. It seems that
it is an entirely different matter using one of these 15 amp outlets
intermittently to say operate a welder than to run an 8 hour burnout
The solution to the problem was obvious. The power point has now
been replaced with a 40 amp switch and both kilns are now directly
wired to the board. All the connections kept nicely cool for the nest
burnout. The lesson is we really need to keep a close eye on our
The attached photos show what happened.
Take care everybody