Discuss RCD and replacement fails to operate in the UK Electrical Forum area at ElectriciansForums.net
It won't isolate the neutral but I think he's just saying remove any loads on the outgoing circuits first and test the rcd without anything drawing current.Turning off the MCBs will not remove the neutral connection! You need to remove the neutral link from the RCD as well.
I've had this on mem 2000 when using the pods to covert the mcb to rcbo.There is no such test as a 5 x trip current on a 100mA rcd (only applies to 30mA) so it may be possible your meter 'knows' this and is not doing anything.
What meter are you using? A couple of months ago I went to test 6 mem 30mA rcbos all sitting side by side in a board, none would trip even when I set my meter to ramp test on a 300mA rcd. I was testing at the terminals. However when I tested from the circuits, they all behaved perfectly, contrary to what I was expecting. This was using a Metrel Mi3101
this is common with some RCBOs; a short length of 2 core flex in series with your test leads will overcome it.There is no such test as a 5 x trip current on a 100mA rcd (only applies to 30mA) so it may be possible your meter 'knows' this and is not doing anything.
What meter are you using? A couple of months ago I went to test 6 mem 30mA rcbos all sitting side by side in a board, none would trip even when I set my meter to ramp test on a 300mA rcd. I was testing at the terminals. However when I tested from the circuits, they all behaved perfectly, contrary to what I was expecting. This was using a Metrel Mi3101
Not always.If there was a N-E fault as soon as load turned on the RCD would trip if I am not wrong
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