This weekend I was doing a little electrical work at my house, which is probably the riskiest area of Do-It-Yourself home repair. You only need to cross a couple of live AC wires once and see the “pop” (and smell the ozone) before the point hits home.
In my case, I was installing a bunch of new light switches for a home automation project (dual-mode mesh network, if you care about those sorts of things). In the process I’m fixing some screwed up wiring installed by the builder; mostly three-way circuits they set up wrong.
I was getting ready to work on the only four-way in the house (that’s when you have 3 switches controlling one light) and cut the power at the circuit breaker. Each of the switches was in multi-gang boxes with other switches controlling other lights, so I had to kill all those circuits as well. From what I could tell, all the power was off and it was safe to work.
But being the paranoid that I am, I also checked with the AC indicator on my multimeter. I just press a button, wave it over a switch or outlet, and if it’s live the multimeter beeps.
And beep it did. Despite killing (I thought) all the lighting circuits for the first floor of my house, one switch was still hot. I then started the methodical process of hitting the rest of the breakers to find the right one.
About thirty minutes later I’d killed power to just about my entire house and still couldn’t find that damn circuit. Staring at my breakout panel (a second panel with the arc fault protection circuits for the bedrooms) I noticed two unlabeled breakers, figured out one of those was what I needed, and got back to work.
In this case my instincts told me the circuit was safe, but my detection tool dissolved that particular illusion. In other cases, especially with my crappy stud detector, my tools are often wrong and my instincts are right.
I guess it’s all a balancing act.
Now I just need to figure out how to get my alarm panel to stop beeping randomly at me. Something about losing power really pissed it off.
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7 Replies to “Trust Your Tools. Use Your Head.”
it’s an expired cert- working on getting it fixed this week, and sorry about that.
We browse to securosis.com because that’s what the RSS feed links to.
The certificate error is if you browse to securosis.com instead of http://www.securosis.com
Been there. When I built the extension to my house, the electrician I hired screwed everything up and I had to redo it…of course after the walls were put up. Most of it I did live and I twitched for weeks. Not sure if that was from the shocks or from exhaustion.
But your point is well taken. Many times in IT we buy the newest wizbang utility or tool and fail to get down and understand what we need to do. The opposite is also true where we get bogged down with policy and over thinking.
>I was doing a little electrical work at my house, which is
>probably the riskiest area of Do-It-Yourself home repair. You
>only need to cross a couple of live AC wires once and see the
>“pop” (and smell the ozone) before the point hits home.
ph’‘uhh you should try playing with 250V as we have here in NZ. Now screwing THAT up will seriously ruin your day!
btw – I’‘m getting an expired certificate error here when I submit a post
I have to say, that’s the first time I’‘ve heard of an electrical project becoming a plumbing repair.
Glad it was you and wasn’‘t me.
I’‘ve only had to call the electricians in twice to fix my mistakes; I figure that’s not too bad.
I failed to make all the ckts in a j-box cold once while working in a basement ceiling where there were copper water pipes, and I managed to ground a hot wire to one of the cold water pipes. Not only did I make my ckt brkr trip, the arc punched a hole in the water pipe. I was faced with both a somewhat shortened wire and a plumbing repair.
I now make doubly sure all the wires I am working around are cold.