HI I am replacing an old subpanel in my garage. The old panel has the neutral and grounds attached to the same bar. The new panel has separate neutral and ground bars, but has a screw to bond the neutral to the ground, if desired. When bonded it would be wired like the old panel. I am going to install it bonded, like the present hook-up, unless someone can tell me why it would be better to leave the neutral isolated from the ground.
Thanks