e-Hazard: The Bath Tub Challenge

Описание к видео e-Hazard: The Bath Tub Challenge

OK Team, who wants to take on the Bath Tub Challenge? Post your opinion!

For the unbelievers, here is the government site warning it can happen.

https://www.cpsc.gov/content/cpsc-cau...

Added 3/7/2017
I did my test this morning after kids got on the school bus. Did not want them to hear me yell if something went wrong. LOL.
With a Fluke 87, I measured about 100 to 200 k ohms for the water resistance in the bucket. But it kept increasing the longer I held the probe in the water. This tells me there was also some capacitance in the water. I used a hot dog to simulate a human body going in the tub. I measured about 150 k ohm on the hot dog from one end to the other. I then put the running hair dryer in the bucket. I then put a Fluke lead probe into each end of the hot dog and lowered it into the water. Depending on the angle and the proximity to the handle where the incoming leads are located, I got between .3 and .5 volts. I measured the water to ground and got between 70 and 80 volts depending on how close to the handle I was.

So this answers a couple of questions. Yes the water is energized. Yes the hot dog is conducting current. But at .5 volts and 150 k ohm resistance, you get about 3 micro amps which is below the felling point. The human body has been said to be about 1,000 ohm resistance. Under wet conditions, that be be closer to 500 ohm. If we were to replace the hot dog with a scale model version of a human body, we would still see about .5 volt drop across the body since it will be in parallel with the water which surrounds it. So this would mean at 500 ohm resistance we should see about 1 ma of current flowing which is right at the threshold of feeling it. So I can see how the man could put his hand into the water and not feel it. The hand is a very small portion of the total body.

But here is the scary part. There will be current flowing in the body under these conditions. It will be proportional to the conductivity of the water and the resistance of the human body. Since each tap water system is different and each body is different, there is no way to predict if the current will be enough to feel or put you in defibrillation. I would guess in most cases, at the very least, it will hurt and may reach the let go threshold level. This would make it hard to move or breathe.

I think the best way to establish this is to do a 2D model of two points in space about 1 inch apart energized to 120 volts and surrounded by a conductivity source like water. This model could then show the current paths and values. Most of it will flow between the shortest distance of the two points.

Any takers to put this to rest?
I think it will help clarify some of the comments. Like the old Clint Eastwood movie. Do you feel lucky?

Joe

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