The usual setup is that a "main panel" will have neutral bonded to the case to make it also ground, and a "sub panel" will not have neutral bonded to the case so that neutral and ground are separate. That allows switching a main panel to be a sub panel (e.g., if a meter main is put in to replace a simple meter but the main panel inside the house is kept intact) or a sub panel to become a main panel (e.g., if an old main panel is being replaced starting with adding a sub panel and eventually removing the old main panel and making the sub panel the new main panel).
When you have separate neutral and ground, it is very clear what you need to do. When you have neutral bonded to ground, the normal usage is:
- Neutral wires can only go on neutral bars
- Ground wires can go on neutral bars or ground bars
With a meter main, at least with this one, there is no separate ground bar included with the panel - it simply isn't needed because, by definition, a meter main will always have neutral and ground bonded together. So instead there are neutral bars on both sides, and enough neutral screws for most installations.
Unlike some panels where one side may be ground and the other side neutral (with a ground bond screw), these two bars are connected together with a bar across the bottom - making them both neutral. The right side actually gets the feed from the meter section, then connects across the bottom to the left side.
Note though that while, as is very common, a true ground bar here can have multiple (2 or 3, depending on various factors) ground wires per screw, the neutral bar can only have 1 wire (whether neutral or ground) per screw.
- You have tandem/double-stuff breakers everywhere
- Very few double-pole breakers (because those only need one neutral for a pair of breakers)
then you may need additional ground bars because your neutral bars will be filled with all the neutrals plus some of the grounds. There are two locations identified for Series LX ground bars:
but since you have a big panel inside the house, you will not need any additional ground bars in your meter main.