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I have an external RCD unit to protect outside lights. This trips intermittently, when it does it also trips the RCD in the consumer unit. If I test the external RCD with the trip switch, it trips and also causes the RCD in the consumer unit to trip. I have tested the circuit and the tests are ok. Any ideas why the consumer unit RCD trips as well, both are 30mA.
 
I have an external RCD unit to protect outside lights. This trips intermittently, when it does it also trips the RCD in the consumer unit. If I test the external RCD with the trip switch, it trips and also causes the RCD in the consumer unit to trip. I have tested the circuit and the tests are ok. Any ideas why the consumer unit RCD trips as well, both are 30mA.
Because there is no discrimination/selectivity. The upfront RCD should be time delayed/S type if the installation method permits.
 
I have an external RCD unit to protect outside lights. This trips intermittently, when it does it also trips the RCD in the consumer unit. If I test the external RCD with the trip switch, it trips and also causes the RCD in the consumer unit to trip. I have tested the circuit and the tests are ok. Any ideas why the consumer unit RCD trips as well, both are 30mA.
Are you an Electrician?
 
Sort the problem that's causing the trip in the first place then the lack of discrimination won't be such an issue -
Hands up for outside floodlight
Hands up for pond feed
I need to drink less coffee!
 

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