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The conductors in MCCs must meet several requirements, such as [430.96]:
Also, busbars must be protected from physical damage and held firmly in place 430.97(A). The first part of this requirement is a reiteration of 300.4. Because 300.4 is in the first four Chapters of the NEC, the requirement generally applies to all installations. Yet the NEC repeats it in many other places.
To satisfy the second part, ensure you follow the assembly instructions for the busbar and fasteners you’re using. For example, you don’t apply the same torque value to a system that uses a Belleville washer versus one that uses a grade 5 bolt with a split ring washer.