D. B. Mcintyre asks a question about sub-mains passing through consumer unit. It has been answered by SELECT (Theme – Distribution Equipment including Cable Management):
Question: We are carrying out a Periodic Inspection Report (PIR) on a domestic flat. The supply to this flat is from a central distribution board, and the sub mains comes in through the back of the consumer unit, then goes out the bottom of it, into a private landlord's meter, and then finally back into supply the consumer unit.
We are wondering if there should be concern over the cable passing through the consumer unit as there may be confusion if somebody switches off the main switch on it, and then presumes that the cable has been isolated - which it will not have been. Is this so?
Answer: This is not an ideal situation and you are correct in highlighting your concern.
Regulation 514.11.1 requires a warning notice to be fixed in each position where there are live parts present, which are not capable of being isolated by a single device.
The location of the isolator should be indicated unless there is no possibility of confusion.
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