Discuss Why is the RCD tripping? in the UK Electrical Forum area at ElectriciansForums.net
Clamping the main earth is not an accurate method of assessing the earth leakage you need to clamp the live and neutral feeding the RCD together and any inbalance will be read by the clampmeter as the true earth leakage as this will include any parallel earth pathsI clamped the Main earth (TNCS). It jumped up to 26mA for <1s and then stayed at around 3mA. It did this every time I tested. It is a poor quality earth clamp meter. He had switched off most of his electronic equipment when I tested, but not unplugged, therefore N still attached.
I think you, ve made the right choice with the rcbo CU. I would also add that the 19ms trip time is very normal for the rcd in my experienceMany thanks for all the replies.
I've gone with the RCBO board and will report back when it's fitted ?
You are quite right that any faults should be investigated before swapping stuff. But in this case the IR results are OK-ish (low, but not out of a EICR pass) and it seems other checks like clamp for leakage, etc, have already been done but nothing pointing to a definite cause.Is all well swapping a board but will not solve the problem with out being fixed.
Me find the fault before swapping.
This is one of those unusual cases.do a full test before fitting new CU...could save a LOT of headache afterwards
Lets put ourselves in the customers shoes, internment RCD tripping over a very long period of time. We dont know the full story of any intervention over this time.
Changing to RCBO's the expense of this for arguments sake £600 and the fault although narrowed down to hopefully one circuit, BUT it still tripping you are not going to be happy.
IMO drilling down on each circuit with IR testing is the way forward, and start investigating the the circuits with the lowest IR.
Reply to Why is the RCD tripping? in the UK Electrical Forum area at ElectriciansForums.net
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