Originally Posted by
David L Morse
Ground the wire in the hose. It doesn't need to be an elaborate ground, just any convenient grounded metal, like your duct if it's metal.
The problem you're having is caused bu induced charge. The dust rubbing against the hose deposits a charge there. That charge then tries to induce a charge in your body, which acts like one plate of a capacitor. When you touch ground that induced charge is able to enter you and produces a shock.
The hose wire or, as Joe suggested, a grounded wire wrapped around the hose, takes up the induced charge. That opposing charge then shields you from the effects of the charge in the hose.
For some entertainment, don't make a solid connection to ground. Leave a small gap and enjoy watching the arcs while a board is going through the planer.:D