> I have a detached garage that I have added a feeder panel (sub-panel)
> to for extra power. Code required that it was a four wire connection
> from the main panel in the house (Two hot, ground, and neutral). Also,
> per code the two ground rods were required and the neutral bus was to
> NOT be connected to the grounding bar in the subpanel.
> Question: (finally) I would like to add a 220v outlet for a dust
> collection machine -- easy wiring, only three wires, two hots and a
> ground -- does the ground go to the grounding bar? This makes me
> nervous as there is not dedicated neutral connection and the neutral
> and grounding bars are not bonded -- as they would be in a normal -- in
> the house set up.
You should have a ground bus bar in the sub panel that is insulated so
the ground is carried back to the house ground rod.