Hi all. New user, but have lurked around here and used advice in other threads before, but haven't been able to find this problem anywhere, so figured I'd register and give it a shot.
I've put in a new dual RCD consumer unit for a customer, went through all the testing with no problems, tested one RCD which was fine, then tested the other and it didn't trip at I. Out of curiosity, I tested it at 5I and it tripped in 9.4ms, then did the ramp test and it didn't trip (reading was >33mA). Figured it must be an RCD problem, so put the other one in its place and had the same issue. The one I thought was faulty worked without any problems in the other place, too.
I'm assuming it must be something in the wiring somewhere, but don't understand what would cause this, particularly as it does actually trip in good time at 5I. I may also just be very stupid, the unit was a nightmare to replace and I was a bit weary when I got around to the testing...!
I'm going back there at the start of the week to finish off, so would appreciate any help or advice anybody else might have who has had this problem before.
Thanks.
I've put in a new dual RCD consumer unit for a customer, went through all the testing with no problems, tested one RCD which was fine, then tested the other and it didn't trip at I. Out of curiosity, I tested it at 5I and it tripped in 9.4ms, then did the ramp test and it didn't trip (reading was >33mA). Figured it must be an RCD problem, so put the other one in its place and had the same issue. The one I thought was faulty worked without any problems in the other place, too.
I'm assuming it must be something in the wiring somewhere, but don't understand what would cause this, particularly as it does actually trip in good time at 5I. I may also just be very stupid, the unit was a nightmare to replace and I was a bit weary when I got around to the testing...!
I'm going back there at the start of the week to finish off, so would appreciate any help or advice anybody else might have who has had this problem before.
Thanks.
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