I have a sub panel on back of house. From main in garage is three wire. 2 hot one neutral. NO GROUND WIRE. Sub has a single bar used as neutral and grounds. Its bonded to case (Screw in). I will add a ground only bar, a ground to earth rod and wire them together. I cannot get the snake all the way through the conduit to pull a ground wire.
Can I run a separate ground wire alongside the conduit to the sub?
Thank you Speters. ArchonOSX, I understand there should be a common ground back to the main, I do not have that. Currently (pre-existing), I have a 3wire 50 amp gfci breaker for a spa in this SUB. Its the only circuit. I was advised to Isolate the neutral bar and add a ground bar, bonding it to earth; Where new circuits utilize the ground bar. In this config would I be protected and no SUB/main panel metal become energized if a short occurred?