ECN Forum Forums General Topics of the Trade General Discussion Area Headroom for panel?

I have a customer who wants to move (replace) his panel from an upstairs closet to the basement, and add a generator transfer switch.

Basement headroom is only 5', and I seem to remember a minimum height requirement from somewhere, but can't seem to put my finger on it.....

Anybody recall, or am I dreaming?

Thanks,
Grov