there has been a debate in my area about bending space at meter sockets, the bending space does not comply for a 4/0 when you come in the back of the meter socket for load side conductors which I agree per TA 312.6 (A). I have noticed that article 312 is very specific in section 312.5 to include meter sockets & in 312.2 enclosures within the scope of this article but 312.6 only specifies cabinets & cutout boxes and the like shall comply with 312.6 (A) though (C) but 312.6 (B) (2) has an exception for meter sockets for opposite wall only.