On Sat, 30 Jan 2021 15:57:04 -0600, dpb wrote:

On 1/30/2021 10:38 AM, Leon wrote:
...

I don't recall if the warning to ground the DC is to prevent an
explosion from a spark or not.

More likely to prevent one from being shocked from static electricity on
the hose.Â* And that static electricity tends to let dust build up inside
the hose.

Well, there's a lot that claim it is but there's simply insufficient
energy there for it to be a viable ignition source for woodworking dust.

I'd be more concerned about drawing a spark off the hose and being
startled into dropping something heavy on my foot.