I'm sure most of the real techs out there already know this kind of basic stuff but while we're on the subject and for the benefit of those who don't already know, let's not forget how important it is to have the entire telephone/aa/vmail system on it's own, dedicated electrical outlet, which also means it's own, dedicated breaker/switch and nothing else wired into that circuit or plugged into that outlet!
All it takes is for one idiot to come along behind a great tech and plug a vacuum cleaner, a microwave, a refrigerator (or a whole power strip full of stupidity) into the dedicated telecom outlet and it's crash city unless you're properly protected! That's also a great way to work a poor little old back up unit right into an early grave.
Anytime I walk into a switch room (especially if it's the first time,) I always like to step back and try to take in the big picture before I ever get down to the nitty gritty. Proper power and environment can make all the difference no matter what kind of system we're talking about.
Unfortunately these kind of warnings often fall on deaf ears so CYA in writing amigos! Anytime I find myself in a switch room from hell, I not only inform my contact about any potential problems, I fill my work order up with all of the necessary recommendations it will take to get that site back up to par so that it never comes back on me for not having enough sense to mention or even notice a potential disaster in the making!
Ok, off of my soap box and back into the trenches.
Good luck soldiers!
Phonehed in Dallas