I bought an older Oliver table saw that is 440V only and also have a Doall saw that is 440v. My shop is wired 220V delta 3 phase.
Found this 25KVA transformer on a local sale and wired it from panel into bottom of breaker with SO cord shown below.
When I first powered it from breaker it "groaned" and in research here I found that I could not ground transformer to panel. Hence the ground wire on SO removed from case ground lug.
Using the 440V taps, I am reading about 445V across 2 legs uniformly. With ground wire to saw tied to ground in transformer case, I am reading about 60V from saw frame to building ground.
Transformer is mounted on a wheeled dolly, ungrounded.
I have since removed the ground wire from transformer case to saw.
My question is:
Can I run ground from panel (isolated) through transformer to the saw grounding to contactor?
The transformer would be isolated from the ground.