Didn't think they were explicitly forbidden, but they won't clear N/E faults, so 100ms later the incomer will trip, and take out the whole installation, which could be construed as a contravention...
I know the regs say that in a system other than TN that circuits must be disconnected from all live conductors but one switch can fulfil this for a number of circuits ie a main switch.
Didn't think they were explicitly forbidden, but they won't clear N/E faults, so 100ms later the incomer will trip, and take out the whole installation, which could be construed as a contravention...
From a non regs POV if you had a fault causing a N-E short on a single RCD pole protected circuit on a TT system then you'd end up with a pretend TN-CS system which could be dangerous.
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