Discuss ZS on final sub circuit in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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EddieB

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Lads
Have measured R1 + R2 and get a total of .45 ohms, when I test the ring with my tester I get 2.1ohms, the unit was calibrated last week, any ideas?
 
what's the Ze? and if it's a sub main, the Zdb?
 
What are yor r1, rn & r2 readings on the ring? Ze or Zdb readings? Is this circuit protected by a RCD or RCBO?
 
Ze is .27, the sleeving is not trapped, the circuit is RCd protected, not that makes any difference to the reading at the sockets, the test lead is a kettle type.
 
You could find that it is the RCD that has the high impedance. Try a loop impedance test both sides of the rcd and see if it differs.
 
The current crop of 2 lead no trip meters give totally unreliable readings as well.....worth bearing in mind if you are testing with one of those.
 

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