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Electrostatic discharge on bus?

Discussion in 'General Electronics' started by Acceed See, Apr 15, 2005.

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  1. bz

    bz Guest

    Static electricity is worse when the humidity is low. When humidity is
    high, even the air can act to discharge the charge.
    Some things act as capacitors and may need to be discharged more than once.

    For example, the picture tube of a TV set. The glass of the tube acts as
    the dielectric of a capacitor. When you work on a TV, you must be careful
    to discharge the high voltage anode connection on the side of the bell.

    After the tube has been discharged, as the glass relaxes and as distant
    electric charges make their way to the conductive coating inside the glass,
    the picture tube will 'build up' a charge again.

    It is wise to leave your grounding strap connected for several minutes
    before you start to handle the picture tube.



    --
    bz

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
  2. bz

    bz Guest

    The pump handle is well grounded. As long as you maintain contact with the
    pump or pump handle, you should be discharged. Make sure your car is
    discharged by touching the metal part of the pump handle to the metal of
    your car. Do this away from the tank filler area before you remove the gas
    cap.

    THEN open the fuel tank, insert the pump nozzle, and pump gas. Don't move
    away from the car while pumping gas, or if you do, be sure and touch a
    metal part of the car away from the gasoline tank, before you touch around
    the nozzle. You do NOT want a spark around the nozzle, because gasoline
    fumes mixed with air are exhausting from the tank as you fill it.

    BTW, 1 gallon of gasoline, properly vaporized, has more explosive force
    than a case of dynamite.

    ....
    I doubt the accuracy/univerality of 'guy thing'/'girl thing'
    classifications, but understand why people feel that way.




    --
    bz

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
  3. w_tom

    w_tom Guest

    Glen and some others have provided a good response. To add
    to what he wrote:
    The discharge means electricity. Charges are not
    electricity. Neither you nor the bus alone accumulate
    charges. Both do. Electricity flows from (or to) charges in
    you to charges in the bus. The charges don't flow.
    Electricity flows from and to charges of different potential.
    Charges you may have created by sliding on the seat.

    Even that little air gap between you and your hand was an
    electrical conductor before your hand actually touched the
    metal bar. Even the insulator air conducted electricity -
    albeit only for a short distance.

    Materials that some consider insulators may be conductors to
    electricity of different voltages and current levels. When
    discussing static electric discharges, some tables, linoleum
    tile, some wall paints, concrete floor, etc all can be
    conductors. Even the string on a kite that appears to be an
    insulator at lower voltages can be a conductor at higher
    voltages. Some things (ie glass) are better insulators than
    others (wood). When you touched the pole, you made an
    electric circuit between two differently charged materials -
    therefore electricity flowed.
     
  4. Rich Grise

    Rich Grise Guest

    It's the friction between the tires (ahem ;-) ) and the road, just
    like a Van der Graaf. :) I got into the habit of touching something
    metal _while_ getting out of the car - that takes care of the pants/
    car seat issue. Unfortunately, at that point the valet gets zapped.

    I've also commonly seen multiple zaps from one charge - when you
    draw a one-inch (2.5 cm) arc, it only conducts until enough charge
    has bled off such that you can't sustain the arc.

    But a 1/8" (1/2 cm) arc, no problem! :)

    Cheers!
    Rich
     
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