On Wed, 25 Jul 2012 11:09:00 -0500, dpb wrote:

On 7/25/2012 10:54 AM, jtpr wrote:
...

4" PVC to do this as it is a whole lot easier, accessible, and cheaper.
But what about static? Is it really that unsafe? Can it be grounded?

...

There is no evidence whatever that any small diameter dust collection
system has had an explosion or fire sparked by static discharge in plastic.

It _will_ shock on occasion like the olden days of wool carpets and dry
indoor conditions.

You can attempt to minimize that by wrapping w/ wire and grounding but
since the material is nonconductive it's of marginal benefit.

The biggest pita w/ it is twofold --

1) The fittings for 4" dust collection aren't the same size as Sch 40
fittings so you have to adapt everything, and

I found some adapters (Rockler) that adapt drainage (schedule 20?) PVC to dust
collector stuff. The problem I have is that I've found that 4" dust
collection hardware doesn't fit 4" dust collection hardware. Indeed,
different tools have different sized ports. Grr.