Mains isolation transformer (Va.)

They're easy to mail-order, from places like Digikey, Jameco, Mouser, Newark, Grainger... 300VA is an easy size to find.

However, if you are using this in an industrial setting you should be working with a licensed electrician to be sure your work meets the electrical code. You can't just lift grounds!

In particular, here's something I think you can't safely or legally do: plug an isolation transformer into circuit "A"; plug equipment "X" into the isolation transformer; and ground "X" using a ground wire that runs to circuit "B", separately derived from "A". Especially if the ground wire isn't a rated conductor of adequate gauge. The reason is that if the hot output from the transformer shorted to ground, no circuit breakers would trip.

If this is just a temporary thing to get some test gear working, forget I said anything :-)

Thank you! I tried Digikey (not in stock) and Newark (something in stock), but Jameco, Mouser, and Granger were less familiar. It seems that Mouser have some good parts, so that may solve the problem.

Yup. Would not cross my mind to do anything in somebody else's plant without having their electrician taking the responsibility...

Extremely temporary.

Thanks once again!

- Ville

Another electronics distributor I didn't mention is Allied, at

Grainger (note the 'i') is an industrial-supply chain. They do mail order but they also have retail outlets; so if you're in a hurry you may be able to find one close to you. They're a great source for replacement motors, pulleys, belts, AC capacitors, things like that, as well as selling everything else industrial from hand cleaner to drill presses. However, they tend to be expensive.

(I have no association with any of the sources mentioned, by the way.)

Try Grainger.