Take nothing for granted when working with Electricity

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re: "Lot's of info and experiences though"
A neighbor asked me to replace the light fixture outside his front door.
"Is the power off?" I asked.
"Yes" came the reply.
I replaced the fixture and ask him to turn the power back on. Instead of going down into the basement, he walked towards me and flipped the switch that was right inside the front door.
I guess his idea of "power off" was a bit more lenient than mine.
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door.
All I would have done was to cut off the same switch. It goes to the same wire , just closer to the light. Just make sure no one else is around to turn on the switch.
As an electrician in a plant, I often just turn off the switch of the room I am in changing ballasts in a room. I do have a locking device I use to keep anyone from just walking in and flipping the switch. Most are not the normal 120 volt units, but they run on 277 volts. As there are usually 3 circuits on the same neutral you have to be careful not to cut into the neutral. To make things really safe you have to cut off 3 breakers and make sure you get the correct 3.
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Ralph Mowery wrote:

In a residential setting, I'd never trust the switch without testing with a current detector. Some idiot could have the switch leg on the neutral side up in the ceiling box. When I replaced the 2-hole outlets here with 3-hole (grounded boxes), half of the outlets were wired backwards.
-- aem sends...
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I never trust a switch without testing the wires I put my hands on. If I can make a direct connection to the wires, I like a voltmeter or maybe a circuit tester I have made by Fluke. If I can not make a direct wire connection I use one of the 'hot sticks' that glow when near wires with power. Even If I see someone test the wiring, I do it myself before touching anything.
If you think residential wiring can be bad, you should see some comercial plants that have anywhere from the 120 volt up to 13,200 volt stuff. Most of that wiring is not even inspected like a house would be.
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Nate Nagel wrote:

At an old job there were about 5 receptacles on the same circuit/s that were on 2 breakers. Scary to think who did what and WHY?
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Yes; on two separate single pole breakers! Maybe it was a mishearted attempt to get the advantages of Edison wired outlets without the third wire???? i.e. some sort of 'heavy loads'!
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terry wrote:

Ran out of 30 amp breakers and 15 amp were on sale?
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Nate Nagel wrote:

The safest thing when working on most any project, be it electrical, plumbing, structural, etc. is to presume whoever worked on it last was a moron, and to thoroughly test and analyze the current situation before doing anything.
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On Sun, 14 Feb 2010 11:38:39 -0600, Pete C. wrote:

I don't need to presume in our place ;-)
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Jules wrote:

Now, now, be charitable. Untrained smart people can screw stuff up beyond recognition. Visiting my sister and Herr Doctor Professor BIL, I often have to bite my tongue hard at some of the things he has committed around the house. But he is mostly a good guy (socialist PC politics aside), and better than her previous guys by far, so I play nice and walk him through stuff real slow. And I have to give him credit, he catches on quick, and he ain't afraid to jump right in to projects. He also has a lot more willpower about completing things than I do. (Wonder if not having internet or TV at home helps with that?) My sister is definitely a world-class SWMBO, too.
-- aem sends...
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On Sun, 14 Feb 2010 17:25:42 -0500, aemeijers wrote:

Yeah... we just have some "interesting" wiring, that's all - and the fusebox above the bath/shower in one bathroom with a thin wooden cover over it held on by one screw was just beautiful :-) (We weren't using that bathroom, but didn't even know there was a fuse box there until the cover fell off with a loud crash one day)
cheers
Jules
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I've used that technique. I've seen electricians use the Jesus Method of locating breakers. I've not tried that one, yet. Someday when I'm more courageous.
Friend of mine has a miswire, when you turn on one breaker, another one pops off. Aparently, two circuits (on two different power legs) got tied together.
--
Christopher A. Young
Learn more about Jesus
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Always turn off ALL the power before working on electrical wiring.
Why?
If you do not know why, then ESPECIALLY turn off ALL the power!
"hibb" wrote in message

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Yes fortunately both on the same 115 volt 'leg' (not phase although they are commonly mis-called that). They are only 'phases' in a 3 phase installation; very uncommon in North American domestic supplies!
Re switching off ALL power ................. may not be completely practical for reasons of other lighting, furnace or other heating, sump pumps, someon else working in the house etc. etc. But AGREE, be very, very careful.
BTW Not partcularly keen on electrcians who just short out the circuit; 'To see which CB trips'! Or those who put tips of two fingers across the wiring 'To see if it's alive'!
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