Discuss Puzzling RCD Fault in the Electrical Forum area at ElectriciansForums.net

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spadxiii1918

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Hi, I need some advise or help on the following problem.
RCD failed trip test. Failed ramp test. and faield to trip out when Shorted between Earth and bus bar.
I had replaced the RCD with 3 other units, but still would not trip. (ELI 1.17 Ohms)3 lead test L N E and 2 lead test L-E (still no trip).
It did however trip from the supply meter tail side and earth
Power supplied by over head cables into loft to meter.
Replaced batteries to meter just to make sure
Any hep would bemuch appreciated.
 
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sparkswillfly

  • Thread Starter Thread Starter
  • #2
try another meter or try that meter on another supply
 
Hi, I need some advise or help on the following problem.
RCD failed trip test. Failed ramp test. and faield to trip out when Shorted between Earth and bus bar.
I had replaced the RCD with 3 other units, but still would not trip. (ELI 1.17 Ohms)3 lead test L N E and 2 lead test L-E (still no trip).
It did however trip from the supply meter tail side and earth
Power supplied by over head cables into loft to meter.
Replaced batteries to meter just to make sure
Any hep would bemuch appreciated.
Could you clarify?
 
S

spadxiii1918

  • Thread Starter Thread Starter
  • #4
Used GS38 approved 2 pole tester to confirm polarity between earth and live on the supply side, RCD tripped out.
 

EddieB

-
Arms
The RCD cannot trip out on the feed side , I would advise you check the feed side and load side of the RCD are correct
 
A

Andy Smith

  • Thread Starter Thread Starter
  • #6
I agree with EddieB, sounds like a wiring issue.
 
B

Bazspark

  • Thread Starter Thread Starter
  • #7
I agree with both previous posts it could very well be something as simple as supply and load tails reversed, keep us posted on how you get on.
 
S

spadxiii1918

  • Thread Starter Thread Starter
  • #8
Hi Guys,
fault turned out to be no earth, although we had an original ELI of 1.17 ohms. When the bonding was disconnected along with the main earth and an ELI taken from the incoming tails and presumed earth conductor the ELI was over 700 ohms.

I take it that the RCD could not "See" any fault as no current or fault was being detected.

Thanks for all your help on this
 

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