Author Topic: Pool Safety Tip  (Read 8703 times)

0 Members and 1 Guest are viewing this topic.

Offline Homer J Simpson

  • Super Contributor
  • ***
  • Posts: 1120
  • Country: us
Pool Safety Tip
« on: May 15, 2014, 11:52:03 am »
Perhaps this was not the best idea.

Not sure of the origin of the pic. A random find today.



 

Offline electrolux

  • Regular Contributor
  • *
  • Posts: 243
  • Country: gb
    • Photography
Re: Pool Safety Tip
« Reply #1 on: May 15, 2014, 12:01:02 pm »
THEY ARE MAD ??? ??? >:D.
The funniest thing about this signature is that by the time you realize it doesn't say anything its too late to stop reading it.
 

Offline madires

  • Super Contributor
  • ***
  • Posts: 5319
  • Country: de
  • A qualified hobbyist ;)
Re: Pool Safety Tip
« Reply #2 on: May 15, 2014, 12:16:44 pm »
RCD quality assurence team at work?
 

Offline dr.diesel

  • Super Contributor
  • ***
  • Posts: 2183
  • Country: us
  • Cramming the magic smoke back in...
Re: Pool Safety Tip
« Reply #3 on: May 15, 2014, 12:33:20 pm »
Perhaps this was not the best idea.

Yup, drinking and swimming don't mix well.

Offline Legit-Design

  • Frequent Contributor
  • **
  • Posts: 562
Re: Pool Safety Tip
« Reply #4 on: May 15, 2014, 12:46:02 pm »
This is old picture...
But current always takes the path of least resistance. Current doesn't suddenly jump for no reason to those blokes sitting there. Maybe if they were peeing and pee had some salts on it and it made good conductor through rest of the water, that could hurt. And peeing in a pool is more wrong than floating extension cord in it.
http://gizmodo.com/341779/how-to-win-a-darwin-award-float-a-live-surge-protector-in-a-pool-on-a-couple-of-flip-flops from 2008...

So why isn't this guy dead if floating extension cord in a pool is dangerous?
 

Offline electronics man

  • Frequent Contributor
  • **
  • Posts: 686
  • Country: gb
Re: Pool Safety Tip
« Reply #5 on: May 16, 2014, 03:24:17 pm »
they are not earthed, electricity isnt going to harm them
follow me on twitter @get_your_byte
 

Offline Stonent

  • Super Contributor
  • ***
  • Posts: 3824
  • Country: us
Re: Pool Safety Tip
« Reply #6 on: May 16, 2014, 03:25:40 pm »
Legit beat me to it! :-DD
The larger the government, the smaller the citizen.
 

Offline nihilism

  • Regular Contributor
  • *
  • Posts: 99
Re: Pool Safety Tip
« Reply #7 on: May 16, 2014, 03:55:28 pm »
It could when they get out of the pool - one wet leg on the ground outside the pool and one in the electrically live water which is isolated from ground by the pool rubber pool.
Ofcourse it's more likely if water gets in the power board it will short out and trip the rcd or breaker first. I still don't think it's a very smart idea.
 

Offline Stonent

  • Super Contributor
  • ***
  • Posts: 3824
  • Country: us
Re: Pool Safety Tip
« Reply #8 on: May 16, 2014, 04:03:12 pm »
In a course I took in highschool that combined physics and chemistry the teacher did an experiment with a light bulb and a beaker of distilled, deionized water.  The wires were in the water but the bulb was not lit.  She then put a spoonful of salt in the water and the bulb lit brightly.
The larger the government, the smaller the citizen.
 

Offline retrolefty

  • Super Contributor
  • ***
  • Posts: 1638
  • Country: us
  • measurement changes behavior
Re: Pool Safety Tip
« Reply #9 on: May 16, 2014, 10:53:13 pm »
But but but I saw James Bond kill a bad guy by throwing a toaster into a bathtub where the bad guy then started venting steam from his ears.

 

Offline AG6QR

  • Frequent Contributor
  • **
  • Posts: 828
  • Country: us
    • AG6QR Blog
Re: Pool Safety Tip
« Reply #10 on: May 16, 2014, 11:20:34 pm »
But current always takes the path of least resistance

To be more precise, current always takes ALL available paths, not just the one of least resistance.  It takes each path in inverse proportion to the path's resistance.

You can be killed by a fraction of an amp going through you.  If, during your shock, hundreds of amps happen to be going around you via a path of less resistance, that fact won't be of much help.

If every conductor you're touching is at very close to the same potential, THAT fact will let you avoid shock, of course.  And that's what we're seeing in these photos.  Still, it's lunacy to put mains power in a swimming pool with people.
 

Offline corrado33

  • Frequent Contributor
  • **
  • Posts: 250
  • Country: us
Re: Pool Safety Tip
« Reply #11 on: May 17, 2014, 12:24:20 am »
That video is great. Something I didn't expect.I guess if the salt water had 70k resistance there was only a small fraction of an amp running through the "circuit," hence why the breaker didn't trip. (Goes to try it in my bathroom.)  >:D I always though water was much more conductive than that... (Akin to a short circuit.) (Goes to measure resistance of my tap water.)

 My favorite quote(s).
"Let me put my finger in the water, this is the finger with the cut on it." "Let me move my finger closer to the wires." "I'm starting to feel electricity here, lets move my finger closer." "Owe that hurt." haha
 

Offline Tinkerer

  • Frequent Contributor
  • **
  • Posts: 346
Re: Pool Safety Tip
« Reply #12 on: May 17, 2014, 12:28:36 am »
If, during your shock, hundreds of amps happen to be going around you via a path of less resistance, that...
...means you will be very charred.
 

Offline max666

  • Frequent Contributor
  • **
  • Posts: 367
  • Country: at
Re: Pool Safety Tip
« Reply #13 on: May 17, 2014, 01:56:11 am »
But but but I saw James Bond kill a bad guy by throwing a toaster into a bathtub where the bad guy then started venting steam from his ears.

In a bathtub you also have a drain that may or may not be earthed, which (if earthed) gives you a second return path.

Mehdi Sadaghdar has no second return path in his video and also makes sure his feet don't provide a second return path by carefully insulating them from earth with his plastic slippers  :-DD
So apart from some capacitive coupling, most of the current he's "probing" is flowing only through his finger and staying far away from his heart.
 

Offline con-f-use

  • Supporter
  • ****
  • Posts: 802
  • Country: at
Re: Pool Safety Tip
« Reply #14 on: May 17, 2014, 02:23:29 am »
I was okay with everything in the video. Not happy but okay, until his finger went nearer and nearer between the live, exposed wires. A tremble or a sneeze and he might have lost his finger. Also safety glasses.
 

Offline Dane Bear

  • Contributor
  • Posts: 31
  • Country: us
    • Bear Tooling Systems, LLc
Re: Pool Safety Tip
« Reply #15 on: May 17, 2014, 02:42:57 am »
Hey guys and gals, Anyone verified that anything is actually live?? :phew:
Hello, Everyone! I am a Tool And Die business owner in Iowa, that has an interest in the more technical side of electricity. For years, I have worked with 480v Polyphase electricity, but never really got into electronics much. I am learning something new every day from the EEV.
 

Offline rexxar

  • Frequent Contributor
  • **
  • Posts: 439
  • Country: us
    • Forever Tinkering
Re: Pool Safety Tip
« Reply #16 on: May 17, 2014, 03:43:54 am »
They would have been far better off running an extension cord all the way up to the table. As long as the cable isn't broken, it seems orders of magnitude safer to have a sealed cable submerged than a power strip floating on some shoes.
 

Offline nihilism

  • Regular Contributor
  • *
  • Posts: 99
Re: Pool Safety Tip
« Reply #17 on: May 17, 2014, 10:32:27 am »
They would have been far better off running an extension cord all the way up to the table. As long as the cable isn't broken, it seems orders of magnitude safer to have a sealed cable submerged than a power strip floating on some shoes.

Or do their cooking outside the pool, or have the table next to the pool, or use a gas cooker, or have the lead suspended from above the table, or depending on the desired outcome - strip the end of the lead back and take turns holding the bare active and neutral in each hand while some else turns the switch on, only problem of course is that the last guy will probably have to turn the switch on by himself.
 

Offline kolonelkadat

  • Regular Contributor
  • *
  • Posts: 200
  • Country: us
  • Obviously, windows are central to Windows.
    • Force Project X
Re: Pool Safety Tip
« Reply #18 on: May 17, 2014, 11:49:18 am »
I remember as a child there was a buried wire that had been exposed through erosion and whatever I guess. If you were to stand on it bare foot while it was raining it would give you this great trembling sensation in your legs and feet. I loved splashing around on that wire.

My point, if I have one, is that mains voltage isnt nearly as dangerous as its made out to be.
 

Offline Legit-Design

  • Frequent Contributor
  • **
  • Posts: 562
Re: Pool Safety Tip
« Reply #19 on: May 17, 2014, 12:32:42 pm »
My point, if I have one, is that mains voltage isnt nearly as dangerous as its made out to be.
Had electrical safety course for the "electrical safety card", that just says can work around electricity safely. We were told in north america much higher percentage of people die of electricity because it's considered "safer". There 110V is normal here 230V. Here in northern europe everything requires certified electrician for permanent installations, anything screwed on to a wall is considered permanent.
 

Offline SeanB

  • Super Contributor
  • ***
  • Posts: 15397
  • Country: za
Re: Pool Safety Tip
« Reply #20 on: May 17, 2014, 02:12:11 pm »
It is Russia, and that is not water, but the drink for the day.
 

Offline kolonelkadat

  • Regular Contributor
  • *
  • Posts: 200
  • Country: us
  • Obviously, windows are central to Windows.
    • Force Project X
Re: Pool Safety Tip
« Reply #21 on: May 17, 2014, 02:31:59 pm »
My point, if I have one, is that mains voltage isnt nearly as dangerous as its made out to be.
We were told in north america much higher percentage of people die of electricity because it's considered "safer".

I wont argue if more people die here or there, because I dont know. I highly doubt the death toll has anything to do with peoples preconceptions about safety though.

If I were to hazard a guess, id say its just a nice thing to tell people (that no one would ever bother verifying) to convince them that the training course is important.
 

Offline nctnico

  • Super Contributor
  • ***
  • Posts: 19839
  • Country: nl
    • NCT Developments
Re: Pool Safety Tip
« Reply #22 on: May 17, 2014, 02:45:21 pm »
My point, if I have one, is that mains voltage isnt nearly as dangerous as its made out to be.
Wait until you lose a friend due to getting electrocuted by mains... Been there done that... In short: treat electricity with the respect it deserves or get a Darwin award.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline Neilm

  • Super Contributor
  • ***
  • Posts: 1462
  • Country: gb
Re: Pool Safety Tip
« Reply #23 on: May 17, 2014, 06:23:48 pm »
If every conductor you're touching is at very close to the same potential, THAT fact will let you avoid shock, of course. 

Which is why you can see videos of people working on live HV overhead power lines
Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe. - Albert Einstein
Tesla referral code https://ts.la/neil53539
 

Offline retrolefty

  • Super Contributor
  • ***
  • Posts: 1638
  • Country: us
  • measurement changes behavior
Re: Pool Safety Tip
« Reply #24 on: May 17, 2014, 07:05:34 pm »
If every conductor you're touching is at very close to the same potential, THAT fact will let you avoid shock, of course. 

Which is why you can see videos of people working on live HV overhead power lines

And why of course birds can perch on live wires.

 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf