The Neutral and Ground bus in a subpanel that was installed in a remodel are
not connected, however the guy left the bar bolted into the neutral bus and
left the other side hanging without a bolt. Basically, he did not bolt the
bar down onto the ground bus. When the electrician that I currently have
looked at it, he said that it needed to be connected and stated what the
correct bolt size for it would be but I cannot remember. It is a subpanel.
The main panel with a main breaker sits out in front of my house and the
subpanel is inside with all of the individual circuit breakers in it, in
additon to the main for that panel. Should it be connected or not?

The old electrician who was a builder/electrician who did the remodel also
left notes saying that an future electrician should split the 3 and five
wire branch circuits to each leg of the incoming power and panel bus to
prevent overload on the neutrals. The new electrician who is a master
electrician, head of a local electrical union said that this doens't really
make sense. Does it make sense?

I also know that the city likes to have all neutral circuits split up at
the device locations and to avoid tying all neutrals together. The new
electrician said that this is not really necessary but would do it if I
wanted him to. Does this make sense?