You need an insulated ground and neutral per 10-806(5) and 10-808(3). Aluminum is cheaper and easier to handle. Using oversized wire increases the required size of bonding and grounding conductors in Tables 16 and 17.
I had an instructor explain wiring above code. He said that the length of wire out of a service head is minimum 30 inches. 3 feet won't be rejected, but it isn't better. It's just a waste of money and material.
I do not need to pull a ground here in my area as the neutral is bonded in the meter base. As for the wire I should use, I could used T90 based on TW75 rating. Would be easier to pull through 3 90's in the pvc run. I am trying to figure out if I can use RW90. I think I am confusing rule 6-300. If I read in one way (6-300 (1)(a)) then it tells me I can use RW90 because my 2" conduit is complete from meter base to Lb in garage (wet location). If I read 6-300 (1)(b) then it has to be a single or muti conductor cable approved for use in underground services. I think the OR between the two allows be to used RW90 in the conduit for my underground service cable. Make sence??
