In a house serviced by a well (not city water) that has a bladder tank to balance pressure and pump use, is this function essentially served by the bladder tank, obviating a need for an expansion tank?
Egress test: One obvious flaw: the window doesn't open!
Got my first perfect score on the 3-way switch wiring. I may be only a homeowner, but I've wired these like a bazillion times. As a teenager, I had to replace a 4-way where we had two sets of three lights controlled at three locations in the hallways/stairs. The box with the pair of 4-way switches in it looked like an octopus gang fight. I couldn't find a 4-way at a "home store" so I had to go to a real electric supply place.
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