On 15/05/2018 13:33, Archibald Tarquin Blenkinsopp wrote:

The test is passed if neither the terminals /
terminations, nor the accessible external surface, increase in
temperature by more than 52 degC.

This will be a one off laboratory test and not necessarily
representative of the equivalent same test (operation of a kiln)
repeated over regular period over years.

It's much like the mpg figures that car manufactures publish but then in
small print tell you that they are not real world figures. And, just
look how clean diesel cars are!

An increase of 52C from an ambient of, say, 20C takes the temperature to
72C. I would expect prolonged use at 72C to degrade the performance in a
relatively short time. There may also be a problem of screw terminals
and thermal cycling where the temperature regularly changes by 50C.


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