[...snip...]

Gee - I'm really sorry you asked that question. Prepare for a lot of pro's
and cons. For in depth information, search for info. Otherwise, *some*
people content that static electricity could generate a spark which will
ignite the dust in the hoses and start a fire in your workshop. Others
quickly point out that there is NOT ONE documented case of this happening in
a home workshop.

[...snip...]

FWIW, I do recall seeing a mention of this in Sandor N.'s book on dust
collection a few years back. He stated in that edition that insurance
companies said they have documented evidence this does happen. Whether
you believe that or not, it might be wise to be sure you don't do
something the insurance companies can use to avoid paying out on a
claim.

There's a new edition of that book out, I guess. I wonder what he says
now?

Anyway, on Bill Pentz web site on dust collection
(http://billpentz.com//woodworking/cyclone/index.cfm) I believe he
says something about using metallic tape for grounding as being easier
than wire.