Article 250.50 states that "If available on the premises at each building or structure served, each item in 250.52(A)(1) through (A)(6) shall be bonded together to form the grounding electrode system."
Given this code requirement and the fact that a new building or structure should have most if not all of the items in 250.52(A)(1)-(A)(6) available; why do most electricians/engineers utilize/specify (1)the underground water pipe, (2) the metal building frame and (5) rod electrode and forget about (3) concrete-encased electrode, (4) ground ring, and (6) plate electrodes?
Also, I commonly see the triad configuration of ground rods with no memtion of this in the code. What purpose does it serve if a #6 copper is all that's required to a single ground rod? The #6 can only carry an amount of current that can be dissipated into the ground by single ground rod within a specific time period. Adding rods won't help unless the #6 is increased in size. Please explain.
Given this code requirement and the fact that a new building or structure should have most if not all of the items in 250.52(A)(1)-(A)(6) available; why do most electricians/engineers utilize/specify (1)the underground water pipe, (2) the metal building frame and (5) rod electrode and forget about (3) concrete-encased electrode, (4) ground ring, and (6) plate electrodes?
Also, I commonly see the triad configuration of ground rods with no memtion of this in the code. What purpose does it serve if a #6 copper is all that's required to a single ground rod? The #6 can only carry an amount of current that can be dissipated into the ground by single ground rod within a specific time period. Adding rods won't help unless the #6 is increased in size. Please explain.