You should be able to have it lower. The basic requirements of the NEC are a
space 30" wide, 36" deep, 6-1/2' high and readily accessible (not behind
locked doors, panels requiring a tool to open, having to climb over
anything, not in bathrooms, etc.). The only requirement concerning minimum
height, is 24" above the floor; but that ONLY applies to mobile home
installations. There's always a possibility that a local ordinance may be
in effect, but I doubt you would have any problems in meeting it.
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