Announcement

Collapse
No announcement yet.

DC Photovaltaic grounding- twice the current for a positive ground?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    DC Photovaltaic grounding- twice the current for a positive ground?

    Why does a positive grounded system result in double the current flowing through the human body? I never knew this was possible.
    Attached Files
    Our comedian shamelessly joked about a blackout. Talk about dark humor.

    #2
    That doesn't sound accurate or logical at all. I downloaded the publication that's from, and it looks like those authors got their "understanding" of DC grounding from another article published in a different journal on the safety of 400V DC distribution in datacenters. I can't read that source without paying for it though. I can think of no reason at all that the amount of fault current would change based on the polarity of the system, or that one polarity would be more dangerous than the other, since there's no way to know in advance what direction the current will actually end up flowing across a victim's chest.

    Comment


      #3
      Originally posted by mpoulton View Post
      That doesn't sound accurate or logical at all. I downloaded the publication that's from, and it looks like those authors got their "understanding" of DC grounding from another article published in a different journal on the safety of 400V DC distribution in datacenters. I can't read that source without paying for it though. I can think of no reason at all that the amount of fault current would change based on the polarity of the system, or that one polarity would be more dangerous than the other, since there's no way to know in advance what direction the current will actually end up flowing across a victim's chest.


      Ok- phewww. Because I thought I was really lacking in electrical theory Then again I still wonder if there is any basis, as my understanding on electrical theory isn't complete.
      Our comedian shamelessly joked about a blackout. Talk about dark humor.

      Comment


        #4
        If you read it again, it doesn't say that twice the current flows. It says it 'seems' like this due to something called the 'heart-current factor.' I have no idea whether the latter is anything real but if it is it would be due to a characteristic of the heart and not the electrical source. Kinda sounds like BS to me but I'm not a biologist.

        Comment


          #5
          Maybe it could have something to do with normal biological electrical current flow in the heart.

          Comment


            #6
            Originally posted by jaggedben View Post
            Maybe it could have something to do with normal biological electrical current flow in the heart.
            It might now that I think about ventricular depolarization. Something tells me they are right, but don't know how to put it into words.
            Our comedian shamelessly joked about a blackout. Talk about dark humor.

            Comment


              #7
              heart-current factor?


              http://www.encyclo.co.uk/meaning-of-...rrent%20factor

              https://onlinelibrary.wiley.com/doi/...1002/tee.20409

              ~RJ~

              Comment


                #8
                I just went over this in detail with a physician who happens to be an expert on the physiology of electric shock. He says it's a load of BS that doesn't make any sense. The heart-current factor refers to the proportion of the total current through the victim which passes through the heart. This does not depend on polarity. None of this depends on polarity. A DC shock in either direction is equally dangerous, all else equal.

                Comment


                  #9
                  Originally posted by mpoulton View Post
                  I just went over this in detail with a physician who happens to be an expert on the physiology of electric shock. He says it's a load of BS that doesn't make any sense. The heart-current factor refers to the proportion of the total current through the victim which passes through the heart. This does not depend on polarity. None of this depends on polarity. A DC shock in either direction is equally dangerous, all else equal.
                  Awesome! Thank you!
                  Our comedian shamelessly joked about a blackout. Talk about dark humor.

                  Comment

                  Working...
                  X