"Bruce" wrote in message
m...
SNIP ....

I use metal, too. The only problem I see with the PVC is that you
still have to ground it, whereas the metal acts as a ground.

"Just one OLD man's opinion."

The Other Bruce
====================
Bruce,
The metal ducting is conductive, but is not grounded unless it is in contact
with a grounded tool, or has a grounding wire run to an established ground
lug/connection.

Ken Moon
Webberville, TX