If you have recessed ceiling lights in high ceilings be very careful when changing light bulbs. Recessed ceiling lights, or can lights, have essentially three sections. The can which mounts to the joists, the socket which accepts the bulb, and the trim that attaches to the bottom that makes the whole outfit look nice and tidy. The socket is wired to the can and the trim attaches to the socket and the can. Many of you will attempt to change the lightbulb using a nice device on the end of an extension pole that grabs and manipulates the bulb. The contraption is essentially a little basket with a spring that pulls the opening close around the bulb. Mine is a visually stunning yellow and black number.
One day while attempting to unscrew a bad light bulb using my hornet-on-a-stick I had great difficulty in getting the damn basket around the bulb. You have to push the basket against the lightbulb just hard enough for the spring to stretch open around the bulb like a giant spincter and grab the stem. On closer inspection I saw that when I pushed the basket against the bulb, the bulb was actually popping up into the can. That's not good. So, I put my spincter down, got my ladder and took a look.
Turns out the builders didn't attach the socket to the trim. There are these clips on the sides of the socket that attach the socket securely to the trim so when you decide to change the lightbulb the socket doesn't pop into the can. Examination of the setup showed why the socket wasn't attached. To get the socket on you must clip off these little notches on the trim, clearly marked, so the socket can be inserted and then twisted securely into place. Since this is an extra step requiring brain power of course Mayo Group workers didn't do it. I checked each light in my ceiling. About half popped into the can when touched. So it appears there was at least one worker paying attention or the same worker paying attention half the time.
The wires are attached to the socket by screws. These contacts are exposed. So if the trim is metal, the light switch on, and the socket mispositioned - you may be in for a jolt when prodding the opening with a metal pole waving metal fingers around the electrically charged trim. Be sure the light switch is off and taped off. Better yet, turn the breaker off and use a proximity voltage detector before you touch the can. I have this nice little green number that was $10. It's 10 bucks. Even if it's $20 - Get one.