Look ... if you think it could be a problem, grab some wire and connect the
two together. You only get the spark where there is a difference between the
two conductors. Wire keeps them roughly equal.

If you then blow a breaker (or fry the wire) when you turn the saw on, that
aint static ... that's 'real' juice and you need to find out where it's
coming from and fix it.

This issue is a perpetual football here on the wreck and the simple answer
is the complete one. Ground it. The cost is small, the effort relatively
trivial, the peace of mind immeasurable. (My plastic pipe lays on a cement
basement floor and stays drained.)

The person who said that kits for bleeding the static from plastic pipe were
hokum doesn't understand capacitance. They do work ... but they are solving
a non-problem.

But the whole issue is probably moot since 1) you probably don't have dry
enough circumstances to allow you to build up sufficient static charges to
matter 2) you don't deal in a dense enough cloud of fine enough dust
particles to matter even if there was a spark plug every six inches in your
ducting and 3) your machines are not running long enough to build up those
charges even under Arizona humidity / worst case scenario.

Relax, cut some lumber. Have fun.

Bill