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On Thursday, 21 December 2017 11:18:44 UTC, The Other Mike wrote:
On Wed, 20 Dec 2017 15:11:25 -0800 (PST), tabbypurr wrote:

wattage ratings to avoid permanent damage from over-heating.

Some power resistors are only specified for claimed power dissipation at
minus 100C!

Care to point to a datasheet that shows that?

http://www.resistorsonline.com/wire-wound-resistor.html

Thats saying nothing like that. Look at the table at the bottom, stupid.
Its saying that the are specified for claimed power dissipation at 70C