I just installed a high amp relay like used on air conditioners for my well pump, part 6564K55 McMaster Carr, rated at 40 amp. The enclosure box is mounted to the floor joists just below the dining room (big mistake).
About once in 50 starts the relay buzzes. The floor joists make a nice sounding board. SWMBO is NOT happy. It would be a difficult job at best to move the control box at this point. I could replace the box, but I have rigid conduit going to this location both from outside the house and over to the main panel.
Such a thing as a 0 noise relay??? Probably not. Sound deadening ideas(that meet electrical code)? other suggestions?
Karl