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Erik Malund
11/09/06 06:07
Modified:
  11/09/06 06:09

Read: 632 times
Mt Airy, Nc
USA


 
#127639 - I disagree
Responding to: Russell Bull's previous message
However, most damage is caused by close lightning strikes. Becuase of the large electromagnetic pulse, anything conductive acts like a turn in a transformer. Therefore, you need to protect incoming wires with a variety of strategies depending on the signal and the anticipated severity.Sheilded cables with the shield terminated to earth at both ends is a start.

If you terminate the shield at both ends you get "a turn in a transformer" between the two 'ends' this will cause a gigantic ground jolt. Tie the shield at ONE end and have a ground connector inside the shield.

The two issues in protection is a) get everything to ground and b) keep the ground from jumping

Erik

List of 20 messages in thread
TopicAuthorDate
Lightning protection      Ap Charles      11/08/06 06:17      
   there is much to this      Erik Malund      11/08/06 06:19      
      Lightning protection      Ap Charles      11/08/06 06:24      
         so doesa EMI      Erik Malund      11/08/06 06:36      
            Mr. Faraday knew how...      Kai Klaas      11/08/06 08:13      
               THICK metal      Steve M. Taylor      11/08/06 09:45      
            Direct Hits      Russell Bull      11/08/06 17:06      
               Keep it out of the encosure!      Kai Klaas      11/08/06 20:08      
                  My pplication      Ap Charles      11/08/06 23:52      
                     Details?      Kai Klaas      11/11/06 08:33      
               I disagree      Erik Malund      11/09/06 06:07      
                  No, no...      Kai Klaas      11/09/06 20:32      
                     Disconnecting the shield at one end of the cables      Ap Charles      11/09/06 23:44      
                        a) and b)      Erik Malund      11/10/06 06:05      
                           Yes, crossed opinions...      Kai Klaas      11/10/06 09:18      
                              and the twain shall never meet      Erik Malund      11/10/06 10:52      
                        the Shield      Andy Peters      11/10/06 14:55      
                           The RS485 signal lines is galvanically...........      Ap Charles      11/10/06 23:01      
                              GND of RS485 bus, PROFIBUS      Kai Klaas      11/11/06 08:27      
   If you get this close        Jez Smith      11/09/06 01:28      

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