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Eaton CH Series neutral bars are mechanical compression wire connection bars used in electrical panels to terminate neutral wires. They enable the termination of multiple wires in a single location, usually at the main service panel, in a compact space.
A
B
CNeutral wire is a return path for the current flowing from load to source. The ground wire is a low resistance path for fault current to flow to the ground.
Neutral bars have a heavy, high-current path between the bar and neutral lug, which is itself isolated from the chassis. It is obvious that the neutral lug-to-bar connection is heavy and designed to flow a lot of current all the time. Ground bars are, by design, in direct contact with the panel chassis.
The size of the grounding wire at the main circuit breaker panel is determined by the incoming service wires. If properly wired, you use neutral as the ground line.