Originally Posted by aoristotle
I have inherited an 80's vintage swimming pool. The pump is a 220v 1hp 0.75kW Hayward Superpump. I installed it new less than 5 years ago. It runs off a 30amp breaker. There are two lights, each: 110v, 500W, which also run off a (separate) 30amp breaker (there is also an outlet on the same circuit as the lights). What amperage switch is appropriate for these applications. I've tried 15 and 20 amp switches, and though it's no problem to change them out, I'm wondering why they keep failing.
I had a, somewhat, similar problem with my barn breezway light system. It was fed by one switch. I replaced the switch five times in app. seven weeks.
After giving up and not using it for several months, a HVAC technician suggested that it could be caused by insects.
Sure enough, I discovered that ants were somehow entering the switch and basically insulating the switch contacts.
Strange that they were only entering the switch at nighttime
I switched off power and saturated the area with insecticide, installed a new switch, and had no more problems for a number of years
Not sure if this will help or not, but it sure surprised me