It is common in woodworking (A hobby of mine) to make a dust collection system (Basically a tube hooked up to a vacuum to carry away dust created from automatic woodworking tools) out of PVC.
We'll assume that we're using a PVC dust collection system (I'm aware that we could sidestep the issue by insisting that we use a conductor)
Apparently, due to the physics-chemistry of rubbing PVC, this develops a large static charge.
Solutions to this problem include running a bare copper wire around the outside, inside, or some combination of both. (Similar to https://www.youtube.com/watch?v=XtkHzmXe4ZA)
My question is: What solution is optimal, and are certain solution invalid or wishful thinking?
PVC is an insulator, meaning (In the traditional charge model) that charge cannot move through regions of the PVC and is not guaranteed to be distributed equally.
Is grounding on the outside of the PVC useless since this isn't where the charge builds? Is screwing into the inside of the tube not helpful since charge can't move to the grounded screw?
What is the optimal way to ground a PVC dust collection system?