I had a fault finding job on Thursday, intermittent RCD tripping. 2 actually, there was a 30mA RCD upstream, and a 30mA RCBO protecting the problem socket circuit, and either one could trip.
I had limited time to work on it, but had eliminated everything obvious through testing, and was happy that the RCDs were working as they should be. The circuit only powered 3 points, and had few items plugged in - wifi router, printer, and a surge protected extension lead with a heater plugged into it.
The neon on the extension lead (indicating that the surge protection is working) was not on, so it must have been defective in that respect. However, the IR results while the extension lead was plugged into the circuit were typical for SP extension leads: >199Mohms at 250V and ~0.4Mohms at 500V (L+N to E).
Could the SP extension lead have been responsible for the tripping RCD(s), even though there was nothing unexpected about the IR results?
I had limited time to work on it, but had eliminated everything obvious through testing, and was happy that the RCDs were working as they should be. The circuit only powered 3 points, and had few items plugged in - wifi router, printer, and a surge protected extension lead with a heater plugged into it.
The neon on the extension lead (indicating that the surge protection is working) was not on, so it must have been defective in that respect. However, the IR results while the extension lead was plugged into the circuit were typical for SP extension leads: >199Mohms at 250V and ~0.4Mohms at 500V (L+N to E).
Could the SP extension lead have been responsible for the tripping RCD(s), even though there was nothing unexpected about the IR results?