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Topic: Electrical Safety (Read 14212 times) previous topic - next topic

Peter_I


how about attaching a small neon bulb to the car, to absorb any static build up?


I think the problem is, that the charge build up is between the driver and the seat.

My hineys are busy rubbing electrons off the seat while driving, and when I get out, the charges are separated.
That also explains, why the effect of the "lightning rod" some people attach to their cars, is quite limited.
"Nothing is foolproof to a sufficiently talented fool"

GoForSmoke

Wearing plastic fiber clothes don't help.
I spent time at the local VA where the carpets were like some kind of Van Der Graff belt. Get up to a door and the habit is to grab the handle and get zapped. I took to touching the painted part of the metal door and while no zap, I could feel the effect of the charge bleed (human, I feel it after it's happened as if it still is). Some time in the past the DoD bought a bazillion gallons of oil based paint and it makes a good resistor.

I have a scare when there's casual static because I am a computer user.
1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Your sketch can sense ongoing process events in time.
Your sketch can make events to control it over time.

fungus

https://www.youtube.com/watch?v=rMIdOThUYfo

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

Peter_I

But there is some fun to it!
Sneak up to a friend, and touch a finger to his ear.
]:D




When my kids were small, they had a plastic chute for playing. Sometimes they played "Pikachu", meaning that one of them would slide halfway down and stop, then touch a finger to the nose of the other, standing next to the slide, and draw an audible spark.
They considered it great fun.
"Nothing is foolproof to a sufficiently talented fool"

Peter_I


https://www.youtube.com/watch?v=rMIdOThUYfo


My goodness!
:smiley-eek:

what was that?
Had he thrown some kind of conductive string over the wires?
"Nothing is foolproof to a sufficiently talented fool"

GoForSmoke


https://www.youtube.com/watch?v=rMIdOThUYfo




Then later to complain about poor electrical service. It is way.
1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Your sketch can sense ongoing process events in time.
Your sketch can make events to control it over time.

cjdelphi

After thinking about it, the neon bulbs would have to be connected inside door frames so it sits between you and the car ... not as straightforward as I thought at 3am

polymorph

Actually, while you are in the car, you have no charge (assuming you are touching the key in the ignition or some other metal part.

The car picks up charge as it moves through the air, and probably some interaction with the tires.

When you step out, you discharge the car. It isn't actually you that has the charge built-up. So what you need to help keep the car discharged is a light wire or chain hanging down.
Steve Greenfield AE7HD
Drawing Schematics: tinyurl.com/23mo9pf - tinyurl.com/o97ysyx - https://tinyurl.com/Technote8
Multitasking: forum.arduino.cc/index.php?topic=223286.0
gammon.com.au/blink - gammon.com.au/serial - gammon.com.au/interrupts

GoForSmoke

They used to be called ground straps.
1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Your sketch can sense ongoing process events in time.
Your sketch can make events to control it over time.

Peter_I


Actually, while you are in the car, you have no charge (assuming you are touching the key in the ignition or some other metal part.

The car picks up charge as it moves through the air, and probably some interaction with the tires.

When you step out, you discharge the car. It isn't actually you that has the charge built-up. So what you need to help keep the car discharged is a light wire or chain hanging down.


There are two theories, and you represent one of them here:
"The charge buildup is between the car, and the rest of the world. You get zapped, because you form the path to discharge the car"

The other one is:"The charge build up is between you and the car. When you get out, you separate the charges, increasing the voltage. The discharge is between you and the car"

I believe in the second explanation.
(And I have had ground straps on cars. In my case, they didn't work at all)
"Nothing is foolproof to a sufficiently talented fool"

polymorph

Peter_I, I think both are correct. It just depends on the vehicle and the conditions.

I've had cars where I'm sure it is the vehicle building the charge. I can touch metal inside, nothing happens. I slide around without getting out, I can touch metal and nothing happens. But if I get out with a hand on metal I can feel a big Snap through my shoe to the ground. And if I get out without touching metal, I don't get zapped until I touch the car.

Other vehicles, I think it is me sliding across the seat, because I won't get shocked if I touch the keys while still inside, but if I start sliding around and -then- touch metal, I get a spark while still inside. If I get out without touching metal, sometimes I can detect a spark through my foot to the ground, and another spark when I touch the car. That would seem to indicate I have the charge.
Steve Greenfield AE7HD
Drawing Schematics: tinyurl.com/23mo9pf - tinyurl.com/o97ysyx - https://tinyurl.com/Technote8
Multitasking: forum.arduino.cc/index.php?topic=223286.0
gammon.com.au/blink - gammon.com.au/serial - gammon.com.au/interrupts

cjdelphi

Between they key/ignition a neon bulb should sit the last thing to do after stepping out is get the key which discharges static build up then?

polymorph

I don't think the neon bulb is necessary, except as an indicator that there was a discharge. The current is low enough that you only feel the spark because it is very concentrated where it hits you. So in that sense, holding the neon bulb is as good as holding a key, coin, or other metal object.

There is always that "wireless" antistatic wrist strap... smirk.
Steve Greenfield AE7HD
Drawing Schematics: tinyurl.com/23mo9pf - tinyurl.com/o97ysyx - https://tinyurl.com/Technote8
Multitasking: forum.arduino.cc/index.php?topic=223286.0
gammon.com.au/blink - gammon.com.au/serial - gammon.com.au/interrupts

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