I met the new maintenance guy a couple weeks ago out in the parking lot after his tour of the Far Eastern Outpost. A nice enough older gentleman, he’d been around the block, fairly well traveled. The impression I was left with after our first meeting was that it appeared he was looking for an easier job that would allow him to comfortably slip into retirement. He was kind of wrong about the easy part:
The refurbished security cameras came in yesterday and his task was to reinstall them. The unit in the dining room should have been a piece of cake since the new motorized camera units simply clip into receptacles in the ceiling. Whoever removed the cameras from service had disconnected the power from the bucket prior to removing the camera.
This is the part where I get to talk about electricity. Direct Current is like your car battery. One wire is positive and one wire is negative. Alternating Current alternates the polarity so many times a second that wires can be connected either way.
That’s nice, I hear you say, but how can you tell which is which? If you have a voltmeter, you can test the wires and see if your reading goes negative if you swap the test probes. You can also tell what you should have by reading the label stuck to the equipment you’re connecting. Now a question—would it be a bad idea to connect wiring for a Direct Current-fed device backwards? Would it be worthwhile to check before you make those connections just to be sure?
One more problem presented itself to our noble handyman as he held the two wires in his hand—three holes. He had three places to choose from and was positively flummoxed. Sweat poured from his brow. He was going to connect these wires no matter what. No testing needed. This inequality though was just too much…
But wait, you’re wondering how I know this, aren’t you? Our intrepid fixer of things had earlier taken apart an adjoining camera mount to get ideas on how to assemble the returned unit. The security staff and I had a very good view into his eyeball from the monitoring station. Once he completed that reassembly, the camera was available to monitor his progress on the new one. It was just a matter of time until the call came.
“Hey, is that Bob the I.T. guy there?”
“You know, this would be easier if you had a voltmeter…”
Yep.