how much volt is needed to be noticable when short to ground via human body
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sunshine_eggo
Happy Breffast!
Depends.
Between 40 and 50 volts. Definitely going to feel 100. Can feel 15 volts if the body is wet and salty from exercise.
But the example does not include the gripping of a hot wire and standing barefoot on a steel floor that is grounded. As long as the electricity stays in the wall it will not be felt. Just standing there is perfectly safe. We do that every day.
But the example does not include the gripping of a hot wire and standing barefoot on a steel floor that is grounded. As long as the electricity stays in the wall it will not be felt. Just standing there is perfectly safe. We do that every day.
robby
Photon Vampire
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Average dry skin resistance would make about 50V as safe.
The reality is that it depends!
If you doubt this take a pint of deionized water and pour it into a cup and measure the resistance in ohms with the probes dipped into the water at opposing sides.
You will get a very high reading.
Now add a small pinch of salt to the water, stir it up and test again. You will soon realize how much effect salty sweat has on lowering the resistance. As the resistance drops the current goes up and pretty soon your playing in the danger zone.
Btw I have seen electricians with crusty dry hands holding onto live 120v lines. They tell me they feel it but they can work with it. On the flip side I touch and instantly get zapped.
The reality is that it depends!
If you doubt this take a pint of deionized water and pour it into a cup and measure the resistance in ohms with the probes dipped into the water at opposing sides.
You will get a very high reading.
Now add a small pinch of salt to the water, stir it up and test again. You will soon realize how much effect salty sweat has on lowering the resistance. As the resistance drops the current goes up and pretty soon your playing in the danger zone.
Btw I have seen electricians with crusty dry hands holding onto live 120v lines. They tell me they feel it but they can work with it. On the flip side I touch and instantly get zapped.
Warpspeed
Solar Wizard
All of the above.
Now a question for you.
If you are at an average location, how far away is the nearest pizza shop ?
100 yards, five and a half miles, 84 miles ?
LeoThomson
Solar Addict
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1999 Darwin Award: Resistance is Futile
Darwin Award: Resistance is Futile: A US Navy safety publication describes injuries incurred while doing don't's. One page described the fate of a sailor playing with a multimeter in an unauthorized manner. He was curious about the resistance level
darwinawards.com
I don't know how true the story is.
But I check if a 1.5V battery is till "good" by licking one end and touching the other end with my finger.
wattmatters
Solar Wizard
Two key words are "ground" and "voltage". To be felt/harm the body is a function of the difference of potential between the two parts of your body providing the path for current flow. This has nothing to do with "ground". If your water pipe is at 110V and the wire is at 120V, you have a difference of 10V and probably can't feel it. Our power system is referenced to ground and the power is trying to get there. Without the ground reference there isn't a path. I worked on series streetlighting circuits that ran over 1000V but weren't referenced to ground. The current was trying to get from one side of the transformer to the post on the other side of the transformer and had no interest in going to ground.
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talking offgrid dc. My ground is actual earth ground and bonded to negative. Positive battery reaches 56volt and positive solar reaches 140v. If i want to play around with my 5 strings on panels i could parallel them to keep up close to 700volt at 10 amp load.
I try ask again, in normal use case, how much voltage is needed to push though my body and a shit ton of building material between my feet and ground/negative/earth
Mike 134
Solar Enthusiast
Are you wearing these boots? rated to 18KV (see it depends)
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HAIX Bootstore
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JHovel
New Member
I learnt that if you cut yourself accidentally and then touch 12V with in the cut (with a bloody surface) it gives you a pretty nasty - unexpected- shock!
Area of contact, skin moisture, salinity level of that moisture, locations and spacing of contact, current, AC or DC current and of course voltage level in any combination of the above. Put a 9 volt battery across any pair of dry fingers…. Nothing, yet touch your tongue, different story. Sorry man….it depends.
Voltage in of itself is not a big indicator if you will notice it. You have to determine resistance so that amperage comes into play. Take for instance static electricity. https://intranet.birmingham.ac.uk/h.../information/electrical/staticelectricity.pdf it can range up to 15,000v with most people noticing 2,000-4,000v. But since the amperage is low at 5 milliamp it does little harm
Push the voltage high enough and eventually it finds a path. Lightning is an example of this. Get up to 500,000v and things not normally considered conductible suddenly are.
12VoltInstalls
life passes by too quickly to not live in freedom
Are you confident in that? ?
I am not confident in that. ?
You are correct. It depends on so many factors from moisture to skin salts to resistance across the unintended path.
That’s high voltage and maybe not felt. Van De Graf EffectWhy?
The answer always depends....
Use case denotes study parameters but I digress.
In your example criteria it STILL depends.
56VDC will almost definitely zap you and is above the threshold for injury or risk of heart failure depending on path and continuity value. 120VDC is a lethal range not worth playing risk analysis with: don’t do it.
Fortunately uric acid salt isn’t the best conductor but does it matter?
i learned that my fluxcore 120V portable Lincoln welder can zap you through sweaty gloves and up your knee while welding metal outside on grass. Probably 35-40VDC.
I’ve also learned that a 12v starter battery in a bonded aluminum boat can give you a burning sensation on a a hot sweaty day. 12V! No blood! Takes a minute but you figure it out.
A 20V lithium cordless drill battery made me think I got a metal splinter for a moment once. Can’t remember the exact circumstances but I remember the pain in my thumb.
Then there is the TENS therapy devices - lotsa volts but no damage to humans.
So the answer is IT DEPENDS. (sorry)
Avoid anything that can shock you. RUN away from anything 55VDC+ (osha says 50V)
sunshine_eggo
Happy Breffast!
That might have also been a reference to adult undergarments depending on the severity of the outcome.... or level of preparation...
Mike 134
Solar Enthusiast
Somebody dare you when a teen to pee on that cattle fence?? LOL
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