- Reaction score
- 479
I think I have an answer
the test button leaks from phase 1 to phase 2.
Try ramp testing between those two phases rather than to earth and see what happens (assuming your RCD tester is good for 400V)
I bet there is either an imbalanced load (in favour of phase 2 or 3), or there is an imbalance in favour of 1 and a N-E fault. This is assuming the RCD tester leaks to earth from phase 2 or 3.
the test button leaks from phase 1 to phase 2.
Try ramp testing between those two phases rather than to earth and see what happens (assuming your RCD tester is good for 400V)
I bet there is either an imbalanced load (in favour of phase 2 or 3), or there is an imbalance in favour of 1 and a N-E fault. This is assuming the RCD tester leaks to earth from phase 2 or 3.