On May 22, 11:59 am, RayV wrote:
Short story made long, my BIL's breaker feeding his pool house kept
tripping. The Black wire was causing the breaker in the house to trip
so I...

Cut and capped the Black wire on both ends
Left the Red wire alone (connected to power on both ends)
Taped both ends of the White wire Black and connected to power
Taped both ends of the Green wire White and connected to nuetral

The pool house is fed by metal conduit (30 years old) that is not in
contact with main house panel.

So now the pool house is 'grounded' via the conduit and the house is
grounded but now they are not sharing a ground.

Should the nuetral bar of the pool house now be bonded to the box
since the box doesn't have a ground running back to the main panel in
the house?

There is zero chance of pulling new wires because of the number of
bends required to get to the pool house and the size of the conduit.

What exactly is causing the Black wire to trip the breaker? Have you
checked for continuity from the black to the white, the green, and the
conduit? As Charles pointed out it is against current codes to re-
identify conductors that are smaller the 4AWG in this type of
installation. I don't have access to a code book at the moment but
the current installation does not sound compliant even if the wiring
was not re-identified. You say repulling a wire is not an option but
could you repull if you pulled out ALL the conductors and replaced
with new in one pull? Another thought is that if the Black wire is
tripping the breaker because it is shorted to the pipe somewhere it
would be better to re-identify the Black as the equipment ground and
re-identify the Green as the former Black wire. It shouldn't matter
if it's touching the pipe since they are bonded together anyway.
NOTE: That would still violate the NEC but it would be better then
the current installation. I'd do a little research in the NEC before
I started adding ground rods and leaving it this way.