Good question. 680 didn't use to say much about corrosive environments, it just required certain equipment grounds to be copper and insulated (feeders, pump motors, lights). Corrosion was the problem, especially any aluminum conductors in pool areas.
I had a pool shed with a panelboard in it. That panelboard deteriorated much more quickly than it would in non-pool area. It didn't help that the bucket of chlorine tabs was kept in the shed along with the chlorine feeder. Dropping some more tabs in the feeder would generally splash out some water heavily concentrated with chlorine which helped create the corrosive atmosphere in that shed. My equipotential bonding wire was in the shed which was bare #8 copper. It was always green and ugly, but seemed to be in good condition. Spent some time shining it up when I added a 2nd pump and needed a tap from it to go to the lug on the 2nd pump.
Are there inexpensive panelboards that would be more suitable for a pool shed (e.g. ones with a plastic or fiberglass enclosure)? You'd probably also want one with a copper bus and not aluminum.
