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3,723 Posts
In my humble opinion there should never be locks on switch rooms or panels
If the building is deigned properly no one without authoraty shoud have easy access to electrical components
240.24(B)
I was just at an apartment building where the panels were located in the corridors, and they were all unlocked. They did not have a 24 hr maintenance man, so the tenants need to be able to get to their breakers to reset them.
Optimal? No.
Required to be unlocked? Yes.