Hello, For the QO140M200C it uses a PK23GTA ground bar which has 23 holes in the bar. For the neutral there is more than what the UL standard requires. Regards, Customer Care Center
Load center QO140M200C does not include the ground bar. Ground bar kit PK23GTA is ordered separately. Regards, Schneider Electric Customer Care
The actual answer is a little more subtle: Each NEUTRAL wire must have it's own screw terminal (this is true in any typical residential panel) However: in most panels, you can share a terminal for 2 GROUND wires. Off the top of my head I believe that all QO panels allow (2) #14 or (2) #12 wires per terminal -but only ground wires -not a combination of Neutral and Ground. This is not about size, it's about whether the wire is used for conducting electricity. Note: If your panel has a seperate ground bus, you cannot use it for a Neutral wire if the path for the neutral wire uses the enclosure as a part of the route back to the Neutral that comes from the power company. You can use the case for a Ground wire, but not a neutral.
If main breaker handle does not properly operate, replacement main breaker required. QOM2200VH is 200A 2-pole main breaker kit utilized in QO140M200C, Series S, load centers.
As the types of breakers were not indicated here, I believe you may be referring to the QO and QO-VH type breakers and what the difference is between them. If this is the case, the QO-VH is rated at 22K AIR and the QO is rated at 10K AIR. The AIR rating would be determined by your local utility and is the amount of fault current available from the utility service. To determine this information please consult your local utility, electrician, or electrical inspector.