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Sasha Jevtic
11/07/05 08:52
Read: 675 times
Barrington, Il
USA


 
Msg Score: +1
 +1 Good Answer/Helpful
#103378 - Safety ground is not for current
Responding to: Vignesh Prasad's previous message
Vignesh Prasad said:
...instead of Neutral, I connect, say a 40W incandescent lamp between Red Phase and Ground?

This will work. That, however, does not mean it is a good idea. Much of the benfit of having a safety ground lies in the fact that it is ordinarily not a current-carrying conductor.

Because the neutral wire is not a superconductor, and is more appropriately modeled as a resistor, it is pssible for its potential at the point of use to rise a notable amount above ground. While this is acceptable for a neutral, from which the user is electrically insulated, it is not acceptable for a safety ground, which the user may very well come into contact with. By using the safety ground as a current path, you introduce the possibility for the potential of the safety ground to rise above true earth ground, meaning the user can get an electric shock if simultaneously touching the elevated safety ground and another object at true earth ground potential!

Note also that the situation you have described will trip ground fault circuit interrupter (GFCI) devices.

--Sasha Jevtic

List of 31 messages in thread
TopicAuthorDate
Diff between GND and Neutral.      Suresh R      11/04/05 21:26      
   Gnd and Neutral      Steve M. Taylor      11/05/05 04:04      
      UK Only      Ian Bell      11/06/05 13:58      
         Depends      Steve M. Taylor      11/06/05 14:16      
   ground vs neutral      Andy Peters      11/06/05 17:53      
      What happens if...      Vignesh Prasad      11/07/05 07:02      
         Safety ground is not for current        Sasha Jevtic      11/07/05 08:52      
            I recall      Erik Malund      11/07/05 09:16      
            (Mal)Practices      Vignesh Prasad      11/07/05 09:57      
               death by electricity      Andy Peters      11/07/05 11:29      
                  Neutral-gnd bond      Steve M. Taylor      11/07/05 13:45      
                     bonded in the panel, separate from there      Erik Malund      11/07/05 14:35      
                        RE: bonded in the panel, separate...      Sasha Jevtic      11/07/05 15:14      
                     clause: IE rules      Vignesh Prasad      11/07/05 19:41      
                        IE ?      Steve M. Taylor      11/08/05 05:31      
                           Indian Electricity      Vignesh Prasad      11/08/05 05:54      
                              Only one ?      Steve M. Taylor      11/08/05 08:12      
                                 Supplier?      Vignesh Prasad      11/08/05 08:22      
   well 'gnd' is not necessarily groun      Erik Malund      11/07/05 07:13      
      Summing up the points      Suresh R      11/07/05 10:05      
         you basically got everything wrong      Erik Malund      11/07/05 10:47      
            to Mr. Suresh      Vignesh Prasad      11/07/05 12:00      
            Reversal...      Abhishek Singh      11/07/05 19:58      
               correction      Abhishek Singh      11/08/05 05:49      
   PHASE, NEUTRAL, SAFETY EARTH,...      Kai Klaas      11/08/05 09:13      
      Difference      Steve M. Taylor      11/08/05 16:20      
         Not in india as well      Abhishek Singh      11/08/05 21:16      
            TN-S mains structure      Kai Klaas      11/09/05 06:06      
               Ours too      Steve M. Taylor      11/09/05 07:20      
                  I tried to explain this      Kai Klaas      11/09/05 15:12      
                     Hardly !      Steve M. Taylor      11/10/05 02:09      

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