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TBH it’s more than likely that the RCD/RCBO can no longer cope with the thermal effects of having a high current running through it for...
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NozSpark replied to the thread
No cpc.
There’s loads of houses around here wired with that cable in the 70’s
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The only change that I’ve noticed on the wiring diagram of the bi-directional RCD’s & RCBO’s is that the test button is also isolated...
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