PVC Pipe Dangers Debunked
4-in.-dia. plastic duct is unlikely to cause a static-induced blast in a home shop
Home-shop dust collection is a controversial topic, primiarily because of the safety of PVC pipe in this application. Some claim that sparks in PVC pipe due to static electricity may ignite the dust cloud in the pipe. Others speak up for grounding the pipe, thus ensuring safety. Rod Cole consulted scientists at MIT to discuss the physics and ferret out the truth.
From Fine Woodworking #153