Optimal Grounding for a PVC Dust Collection System?
What is the optimal way to ground a PVC dust collection system?


You CANNOT ground a PVC pipe. Charge WILL accumulate on both the interior and exterior surface.

You can reduce the accumulation of charge by:


Running a wire inside the pipe to reduce internal charge buildup.
Running a wire outside the pipe to reduce external charge buildup.
Increase the humidify of air in the pipe.
Introduce ionized air to the pipes (this is used heavily in the manufacture of plastic pipe where charges can be dangerous)
Introduce some conductive coating to the pipe (Y-Shield makes a conductive and RF shileding paint, but it's expensive)


Ideally, DON'T use PVC pipe for extractors unless it's manufacvtured to be anti-static  ...but since you already seem have used a non-antistatic pipe you need to control the static buildup.