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Originally Posted by GroundUrMast
The last several years of my dad's career was spent programming to millionths of an inch and routinely hitting 100's of thousands with the EDM. (Tooling and molds for aircraft grade switches, etc.)
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Aha, so you know about EDMs. Hardly anybody knows what a moldmaker is, much less an EDM.
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How about looking for an arcing contact in a thermostat? Or, bad connection to a heater terminal. (Arcs produce a great deal of RF interference.)
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I just found out that it is the tank heater -- which has a thermostat, and, of course, a heater. I unplugged it and the static stopped. I had previously tried both battery chargers and they were fine.
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Yes, each major machine in the shop should have it's own ground. Some things to look for,
Grounds shared by separate circuits.
In the sub-panel, the neutral bus should not be bonded (connected) to ground at the sub panel. There should be a neutral wire (bonded to ground at the service panel) and a separate ground wire feeding from the service panel. Only the ground wire bus should connect to the chassis of the sub-panel. If this does not make sense, consider having a licensed electrician look at the situation...
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Yes, I remember this vaguely now, I wired it myself about 30 years ago with the help of a code book and an electrician buddy to tap when necessary. The cable between the buildings has 4 conductors, a ground and a separate neutral which corresponds with what you said above.
I've never had any electrical issues in the shop, so it seems clear the tank heater itself is at fault. A buddy of mine built it for me, so I'll have to get him to fix it.