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Relay switches
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I visited an open house next to a former friend's house in the neighborhood I grew up in. I always was curious about it as it had some interesting outdoor lighting and was the first house I ever saw with a solar panel on the roof. It's a huge house, and was owned by an electrician originally; as you can see, all the lighting is controlled by relays and note the triplex outlet. I didn't get a picture of the neon glow lamp on the ceiling outside the kitchen (not sure why it was there) nor the T12 slimline 4' & 8' shoplights in the basement shop, or the collection of vintage T12 slimline lamps, but this place was a goldmine.
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If my eyesight is good, that seems to be the GE system. Technically I'm qualified to install them, along with Douglas systems!
That house used twin momentary contact buttons like the start-stop buttons on a motor control instead of a rocker switch.
As for my school, they used relays since the lighting was 347v and to allow the projection system to control the lights. It's pretty neat, there are different lighting presets in the rooms for video, teaching, etc.