I had just opened up a VARIAC that I have used occasionally over the past couple of years, and noticed that the ground wire is not connected to the chassis. I confirmed that the panel mounted electrical outlet is not electrically connected to the chassis either, the thick powdercoat is preventing any connection.
My understanding is that the chassis of a 3-prong auto-transformer should be connected to the ground wire.
Am I correct?
Should I add a proper ground connection to the chassis?
See the picture. I was adding a digital display, as the analog meter was completely inaccurate. The putty you see attaching the new display is Sugru, a silicon adhesive putty.