wireman1
Senior Member
According to article 250.66 the size of the grounding electrode conductor
does not have to be bigger than 3/0 copper or 250 aluminum. Example:
a 2,000 amp service in which you run 6 - 3 inch rigid conduit pipes each
containing 3 thwn 500 mcm copper conductors which you paralell for a
2,000 amp service. The size of the grounding conductor would be a 3/0
copper conductor, yet the size of the wire for the bonding bushings on the
rigid pipes would have to be 12 1/2 percent of the total circular mill area
of the 6 - 500 mcm cables to bond all the pipes together.
Could you take a size 1/0 wire from each rigid pipe to the grounding bar
located in the switch gear and accomplish the same thing?
Would this be acceptable by the code?
does not have to be bigger than 3/0 copper or 250 aluminum. Example:
a 2,000 amp service in which you run 6 - 3 inch rigid conduit pipes each
containing 3 thwn 500 mcm copper conductors which you paralell for a
2,000 amp service. The size of the grounding conductor would be a 3/0
copper conductor, yet the size of the wire for the bonding bushings on the
rigid pipes would have to be 12 1/2 percent of the total circular mill area
of the 6 - 500 mcm cables to bond all the pipes together.
Could you take a size 1/0 wire from each rigid pipe to the grounding bar
located in the switch gear and accomplish the same thing?
Would this be acceptable by the code?