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Don Y[_3_]

On 12/1/2015 8:55 PM, wrote:
On Tue, 01 Dec 2015 20:25:06 -0700, Don Y
wrote:

I'll just have to
unwind it from its "storage spool")

Try just unwinding it from the spool and trying it again. You may just
be coupling current into the grounding conductor.

Because of that, they do have specs for different wiring methods and
the total length of the circuit.

Again, nothing changes on the spool between the first breaker closure
(that trips) and the second (that holds).

Same extension cord used in previous years. Tree is in the same location
that it was -- as is the electrical outlet (i.e., so, no more or less
cord on the reel than in past years). Same strings of lights (though far
FEWER of them). Same ambient temperatures. etc.

I'll have to play with it some more to get a better characterization
of how it behaves (different size loads, different TYPES of loads, how
long the circuit needs to "rest" before the problem will reproduce, etc.)