I'm using a small, switching power supply for a project. (It's a Kaga sx15u-05s). When hooking it up, I found terminals for line and neutral, but no place for a ground wire. It ran fine without one, but after a bit I decided I'd be happier running grounded, and looked a bit more carefully.
I found a floating ground (FG), but after reading up on this I decided it probably wasn't meant to be hooked to the ground prong of a plug. Then I found that the metal cage of the power supply was marked with a ground symbol, and had a screw hole to attach a wire to. Ah ha, I thought.
But being nervous, before I hooked up the ground wire, I checked the AC voltage between the cage and the outlet's ground - and it came up about40vac.
Is that normal? I'm not going to attach the outlet ground there until someone tells me that it is. :-)