I have 20 plus buildings in Iraq fed from a primary transformer and switchgear. I am feeding direct buried cable to sub distribution boards and cincluding a ground derived from article 250.The main service transformer secondary will be bonded in the MDP(250-66 or 250-36(b) and from there we will have separate ground and neutral conductors.For each building I will have a driven rod tied to the ground buss in the sub-panel as well as the steel water lines bonded back to the panel ground buss/250-66..The neutral will only be bonded at the MDP,all sized per art 250,where 250-24(b) refers to Service equipment such as multi metering at strip centers,etc?? Thanks