I have 3 pool pumps operating on individual 220 circuits. Each pump is
grounded with an 6 AWG bare copper wire to metal structures of the pool
from the bonding lugs on pumps. All wire is carried in metal conduit.
Each pump has two hot lines (black and red) coming from the main
breaker panel. The pumps are all connected to a single ground (Green)
which is grounded (attached) to the box containing the pump switches.
For additional safety I wish to replace each pumps 2 pole breakers with
2 pole GFIC breakers. Because I do not have a neutral and I understand
that the ground and neutral bars are connected in the main, I assume
that to make the breakers function properly I must route the ground
(Green) through the GFIC breaker where the neutral line would attach
and attach the pigtail on the breaker to the neutral bar in the main
breaker box. Is this correct? If this is the case I will need to
detach the ground from the switch box and pull a ground to the main
breaker box? Should a pull three separate grounds, one for each pump,
or can I use a single ground that is spliced in the main breaker box so
I can route the ground to each of the breakers?