On Friday, 18 December 2015 19:43:47 UTC, Tim Watts wrote:
Thinking P=I^2 x R, even if the switch has a contact resistance of
0.01 Ohms, that, for I=40A, would be 1600 x 0.01 = 16W developed across
the contacts. In a fully plastic enclosure, I guess that is actually
quite a bit of heat. Could be reasonable I suppose...

Maybe Amendment 4 will require all switches 16A to be in non-combustible enclosures.

Owain