My electrician just installed some standard 3 prong switches and outlets. I noticed he stuck the wires in the back rather than screw them on the side. Is this acceptable practice and usually code? I was worried they may come loose, especially as I went around pulling them out of the box to see the work performed.
Additionally, we notice that every time our 4 tone AC unit starts, all the lights in the house dim for a couple of seconds. Is this a sign of danger, and what should I check to be sure our service is safe?
FYI - It's 100 amp service in a 2000 sqft house with several breakers still available.