Ask your power company. They are the ONLY ones who can answer this question accurately.
In MOST areas it is literally against the law for you to even be messing with these connections.
If you are allowed to do this they will have very specific instructions as to what to do.
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2008 & 2011 NEC.