"jd" wrote in message
. ..
can't speak for the hose ends, but I would at least ground the wire inside
the hose to the DC - this will allow the static to discahrge through the
DC. I'm not sure what having a second ground (at the machine) would do.
I doubt that a home shop could have a dust explosion (I've never seen or
hear irst hand evidence of it). However, I have (persopnally) gotten a big
enough static charge on an ungrounded DC hose to literally knock me over
when I became the ground. No burns, but I was suddenly on the ground and
saying "what the hell...."

I agree. I was thinking that the hose wire was enough. I did mention to
the sales lady that I was also going to continue use my ShopVac hose which
is all plastic. Then I would have needed to have the extra ground wire. I
have since changed plans.
I once witnessed the wood shavings and dust standing at attention on the
outside of the plastic shop vac hose one day. Looked like iron filings on a
magnet. Being the curious one, I ran my hand down the hose to brush the
saw dust away apparently I was holding onto something grounded. Busssssst.
Damn.