I have an out-building 150+ feet from the main service panel with its own 240v 60 amp sub panel. It is powered via a four wire bundle going through underground conduit — 2 x 120v feeders, 1 neutral, 1 ground. This is a sub panel in a detached building so the neutral and ground will not be bonded in the sub panel. The sub panel is on the inside of the building.
There is a Square D D222NRB non-fused 60 amp safety switch installed on the outside and that is what the underground conduit is connected to. The safety switch has two sets of two lugs for the incoming and outgoing feeders, plus a neutral bar to accommodate the in and out neutral.
There are no lugs nor any obvious spot to mount a separate grounding lug or bar for the ground, in the safety switch.
It feels wrong to not bond the ground wire to the safety switch box. I always bond the ground to the box in any metal enclosure I am connecting wire in. The lack of a ground lug and seeming complete lack of even a space to mount a ground lug is throwing me for a loop, though.
Is the ground wire intended to pass through the safety switch on its way to the sub panel?
Best Answer
Look for the grounding symbol stamped into the switch enclosure
There will be a grounding symbol stamped into the switch's enclosure somewhere around the bottom-left corner, as per the wiring diagram. That symbol marks where the ground bar, a Square-D GTK03 in your case, goes -- there should be a hole and a bump near it.