250.24(A)(5) Load-Side Grounding Connections.
A grounded conductor shall not be connected to normally non–current-carrying metal parts of equipment, to equipment grounding conductor(s), or be reconnected to ground on the load side of the service disconnecting means except as otherwise permitted in this article.
also, if connected together the neutral current will flow through the ground wire and possibly any other grounded metal item and who knows what's going to happen.