I just received an engineers drawing for a 400 amp underground service to a single family house. Here is what I do not agree with and I am sure I will have support on this forum. From pad mount transformer he has 6 300mcm xhhw Al being run in single 4" PVC to meter pedestal along with a 1/0 CU ground. Is the ground wire from padmount to meter pedestal o.k.? From meter pedestal we have two runs of 4/0 AL xhhw in separate 2 1/2" pvc conduits going to house and each run has a #2 Cu ground wire in it. First run hits a main disco. inside house for supply of a 200 amp panel at other end of house (PP2) second run hits 200 amp panel (PP1). Grounding - this is where the problem with design seems to be, is as follows- #2 CU from water line hitting main disconnect and then 200 amp main panel. My question here is no detail is given. Shouldn't #2 CU be continuous through the main disconnect hitting ground bar and then go on to PP1. Also is the #2 CU in both runs from meter pedestal correct? I must admit I am confused with what I have been presented here. Also am I correct to be keeping my grounds and neutrals seperated with my OCPD being at meter pedestal?? Finally he has me supplying PP2 with 3 4/0 XHHW AL from disconnect and a #8 CU ground. Now I know this is not right, should be a #4. I just wanted some input before I respond to engineer with list of issues. How would you tactfully suggest this appropriately to the engineer?