[R-390] warm outlet?

[Bill Hawkins]

Well now, I replaced a 25 amp outlet that had melted the plastic
that held things in place. The incoming #10 wire had been crimped
to a ring lug and the lug secured under the screw. But #10 is very
stiff, and when the outlet was installed in the wall, pressure on
the lug loosened the screw. That provided enough resistance to heat
the connection to the melting point of the foundation plastic.

Also, an outlet that had been frequently unplugged and plugged had
tight connections but the plug got hot from the contacts loosened
by simple wear.

I'm sure there are other reasons, but there's two examples.

Regards,
Bill Hawkins