Preventative Maintenance Plan

Tough question Michelle - The USGBC doesn't establish specific parameters as to exactly what a PM plan should look like, largely because they want folks to make their PM plans work effectively for the buildings, not just for LEED purposes. That being said, the expectation is that all aspects of a given system are maintained over some time horizon, even if it is a longer horizon. So I would recommend that the PM plan for lighting systems include all aspects within reason - fixtures, panels, switches, etc... - even if not every item is attended to monthly, quarterly, or even annually. The exhaust fan example in the Reference Guide is a useful illustration - checking key elements and attending to things that will benefit from regular attention. Sorry there isn't a more hard & fast rule. Hope this helps a bit.