enblethen wrote:
If the connector is soaking wet it could be enough to trip breaker.
We need to wait for the OP to say:
What kind of circuit it is. If it is a 15/20 amp then he is tripping a GFCI.
I have seen 30 amp outlets completly under boiling water and the breaker did not trip.. I have used hot-steam type vaporizors that had more metal in the salted (To make it more conductive) water than you find inside a TT-30 outlet and they ran on 14 amps or less.
SO unless that outlet is a GFCI.. I do not see wet outlet on end of line being the issue.
Intermittnat short inside connection (plug or outlet) or GFCI breaker are the only options I see.