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Brand new Wylex CU, both RCDs showing the same impedance. I was thinking along the same lines as you guys but its good to have it confirmed. Might take it up with Di-log. Technology's great but sometimes it causes more problems than it cures.

While investigating higher than expected Zs readings on a final ring, I find I get about one ohm difference across the RCDs in the CU when doing a live test. Ze is 0.1 but Zs on the downstream side of the RCD is 1.1. This is enough to push Zs on the ring out of spec. The actual resistance across...