Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Corrosion on the cable fooled my test meter

  1. Jun 29, 2005 #1

    wolram

    User Avatar
    Gold Member

    Yes i had two today, one was because corrosion on the cable fooled my test
    meter, the other was because a door swich knob was not in mechanical
    contact with the switch, two in one day is just not fair, i must be getting
    sloppy, as i have only had two others in my life ,but then i must be lucky as
    everything is wet where i work.
    Have you had one and lived to tell the story?
     
  2. jcsd
  3. Jun 29, 2005 #2
    My son and I were working on one of our cars, I didn't notice he had connected the battery in a test mode, and my wrench hit the wire. :eek: I couldn't let go of the wrench, so my son pushed me to the ground. My arm hurt right down to the bone for a week after.
    We now have a series of verbal checks, before connecting anything to power.
     
  4. Jun 29, 2005 #3

    wolram

    User Avatar
    Gold Member

    Yes it does hurt :cry: but i seem able to recover quite quickly.
     
  5. Jun 29, 2005 #4

    JamesU

    User Avatar
    Gold Member

    Am I the only one here not clumsy enough to get shocked?

    but one time, I bought one of those shock pens. And my friend throught it was a good idea to press the button into the electrical outlet. you can imagine how that turned out. :surprised
     
  6. Jun 29, 2005 #5

    Ivan Seeking

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I have taken...either 250,000 or 500,000 volts before, I'm not sure now... but I'm guessing that Tesla coils don't count. :biggrin:

    Was once bitten by a spark plug wire. This is really a good bit to remember. If you checking spark plug wires, don't lean over the car from the side, with your the area below the waist in contact with the car, and then grab a wire. If you have a bad plug, the circuit will seek ground through, guess what? :surprised That's 20,000 - 30,000 volts, boys.

    Bitten by 110VAC, and spark plugs numerous times.

    The closest call that I have ever had at work involved a 480 Volt, 3 phase, 200 amp service for a CAT Scanner. This was a mobile scanner parked at a private clinic, and I went inside and turned off the power to check the main plug for something... I don't remember what anymore... but they didn't have any kind of lockout. And, of course, someone didn't get the word. While I was into the receptacle with my screw driver, someone inside turned the power back on. The screwdriver was in direct contact with at least one leg of power, and luckily it was in also direct contact with ground. So in addition to the explosion in my face, the screwdriver pretty much vaporized with me still holding the handle. Of course, I ALWAYS wear my safety goggles, so my eyes were protected from the molten metal. And I did get a few burns as I recall. But I didn't get shocked.
     
    Last edited: Jun 29, 2005
  7. Jun 29, 2005 #6

    Monique

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    One time my boyfriend had the bright idea to put a cheap-bought multimeter in the electric outlet, to see whether the multimeter would give a reading. I was working on a presentation I had to give the next day and warned him NOT to put the thing in the outlet, he would either get shocked so that I'd have to call the paramedics, or it would blow the fuse so that I could say goodbye to my presentation.

    Ofcourse the curiousity took the best of him and he inserted the multimeter in the wall.. WHOOSH.. all the lights went out and I was sitting in the light of my desktop screen that switched to battery mode. THANKfully he didn't get shocked! The next worry was whether there were any new fuses, I had already lighted some candles to read the papers I would be presenting on, luckily it was a switch fuse so my BAD mood disappeared when the lights came on again :rolleyes:

    The only time I got shocked was when I tried to pet some horses that were standing in a field and leaned on the (electric)fencing to reach them.. ouch.
     
  8. Jun 29, 2005 #7

    brewnog

    User Avatar
    Science Advisor
    Gold Member

    I took ~15,000V off a bare HT lead once, I was trying to wiggle it onto the top of a spark plug when my mate decided it would be a good idea to turn the engine over. Won't do that again, my arm was spazzed out for about an hour.
     
  9. Jun 29, 2005 #8

    Integral

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I shorted 500VDC to ground through my little finger. It left a pretty good burn at the exit.
     
  10. Jun 29, 2005 #9

    Ivan Seeking

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Fun, huh! :tongue2:

    We have used a lot of that around here. BTW, many animals learn to tell when its on. If there was any kind of problem with the system, at the least, the goats and dogs, and I'm told horses can tell. As near as I can tell they smell the wire. Could they be sensitive to ozone? It does look more like they smell it, rather than sensing a tingle. They don't get close enough from what I've seen. But there is no doubt about it. I have watched the goats and at least one dog test and test and test, and when the fence went off or failed, within almost no time, those animals would escape. Of course, with the other two dogs, I actually took the fence down and they still wouldn't cross the line! :rolleyes:
     
  11. Jun 29, 2005 #10

    Moonbear

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I had goats that jumped through an electric fence between the pulses. The control box gave an audible click every time the electric pulsed through, and I suspect they could just hear the click. The pulse would go through, and then they'd climb through with plenty of time before the next click...except one I caught halfway through that stopped when I startled it and gave quite a bleat when she didn't get back out in time.
     
  12. Jun 29, 2005 #11

    Ivan Seeking

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I wouldn't think that applies in many cases. Here, at times they may be as far as 500-700 feet away as from the control box. And...there is a New Zealand produced zapper used for sheep [that will literally put you on your knees] that an acquaintance of ours used. It makes no sound, but I know that his sheep would test the fence and escape as well. But some of these fences stretch for miles. It couldn't all be sound from the box.
     
  13. Jun 29, 2005 #12
    I've had a couple very minor shocks but definitely not anything like what you people are talking about.
     
  14. Jun 30, 2005 #13

    wolram

    User Avatar
    Gold Member

    You have a farm, are you a country girl?
     
  15. Jun 30, 2005 #14

    wolram

    User Avatar
    Gold Member

    By IVAN

    The closest call that I have ever had at work involved a 480 Volt, 3 phase, 200 amp service for a CAT Scanner. This was a mobile scanner parked at a private clinic, and I went inside and turned off the power to check the main plug for something... I don't remember what anymore... but they didn't have any kind of lockout. And, of course, someone didn't get the word. While I was into the receptacle with my screw driver, someone inside turned the power back on. The screwdriver was in direct contact with at least one leg of power, and luckily it was in also direct contact with ground. So in addition to the explosion in my face, the screwdriver pretty much vaporized with me still holding the handle. Of course, I ALWAYS wear my safety goggles, so my eyes were protected from the molten metal. And I did get a few burns as I recall. But I didn't get shocked.

    Methinks you need a new job away from electro mechanical devices, buildings
    etc, have you ever thought about sheepherding
     
  16. Jun 30, 2005 #15

    Ivan Seeking

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    No, my record is perfect wrt work, but I realize that you Brits think about sheep alot.
     
  17. Jun 30, 2005 #16

    wolram

    User Avatar
    Gold Member

    By IVAN
    but I realize that you Brits think about sheep alot.

    This is true, but they seem to be disappearing :surprised and oil seed
    rape taking there place :yuck:
     
  18. Jun 30, 2005 #17

    Moonbear

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I don't have a farm, I work on research farms...or did...and will again in 2 months (my PhD was done in an Animal Science department). :biggrin: Actually, with this next move, I think I will officially be a country girl too...I don't think there's much room for city slickers in West Virginia. :rofl:
     
  19. Jun 30, 2005 #18

    wolram

    User Avatar
    Gold Member

    Some of you americans seem to lead a nomadic life, how do you feel about
    your moove, will you miss friends, how do you find homes at such short
    notice, anyway i hope you like your new home.
     
  20. Jun 30, 2005 #19

    Moonbear

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Academics definitely live a nomadic life. I haven't had time to make many friends here, and most of the ones I do have are moving too since we work together. I hate having to move so often (I used to like it; it was fun getting to live different places and meet different people, but now I'm getting too old for it and just want to settle down and stay put). It's not hard to find places to live on short notice, mostly because other people need to sell on short notice too.

    Well, I'm just inside briefly and then heading back out to our neighborhood shocking story...I currently have power or phone lines (don't know which at the moment) draped across my driveway; the rest are in the street...we had one heck of a storm whip through here a few hours ago and took out half the tree in the yard across the street. They're the ones without power or phones right now; I don't know if they'll have to cut mine at some point to do the pole work. Since the tree is across their neighbor's driveway and car, as soon as the lines are disconnected, they need to get it removed, so I've offered to lend a hand as soon as we can get out and do that.

    Oops...power company is heading for the pole, so I better send and disconnect just in case.
     
  21. Jun 30, 2005 #20
    What was your thesis? Maybe I'll check your journal.

    I got the nastiest shock of my life about four days ago. Off the electric starter on the gas cooktop - Ouch!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Corrosion on the cable fooled my test meter
  1. The Fool's Razor (Replies: 13)

  2. I Passed My Test (Replies: 15)

  3. April fooled (Replies: 79)

  4. April Fools (Replies: 13)

  5. The wisest fool (Replies: 8)

Loading...