there is a DB board fed from a centre tapped transformer only on single pole breakers. The board feeds instrumentation. Is there any issue changing it to 110v and tie the neutral to earth there is no socket outlets fed on this so can’t see it as an issue?
Go and get a centre tapped site transformer and, so long as your loop tester is okay at 55 and 110 volts, stick the test probes into the outlet socket and do some loop tests L1-E and L2-E.
Then disconnect the circuit protective conductor on the 240 volt supply side and try again.
Disconnecting the earth on the input side doesn't make any difference, as the 110 volt earth loop starts at the transformer and is merely referenced to the earth on the 240 volt side (or 415 volt side).
Go and get a centre tapped site transformer and, so long as your loop tester is okay at 55 and 110 volts, stick the test probes into the outlet socket and do some loop tests L1-E and L2-E.
Then disconnect the circuit protective conductor on the 240 volt supply side and try again.
Disconnecting the earth on the input side doesn't make any difference, as the 110 volt earth loop starts at the transformer and is merely referenced to the earth on the 240 volt side (or 415 volt side).
