Gus Ferguson asks a question about multicore cable being used to serve two circuits and whether this is an acceptable arrangement. It has been answered by SELECT (Theme – Regulations & Legislation):
Question: One of our electrician's has been carrying out a periodic inspection report (now EICR), and has noticed a single four-core MICS cable being used to serve two individual circuits. Each circuit has its own fuse, and each uses two dedicated cores of the cable to derive the circuit line and neutrals, with the sheath used as a common earth. Final connections at the end of the cable are made via a joint box, from which individual cables are run to the relevant items of equipment.
Much as the above sounds a bit strange, but I can't think of anything wrong with the method as long as warning labels are fitted at the source to advise of the arrangement. Can you give me your thoughts?
Answer: This is not an ideal situation. A warning notice is indeed required to indicate that more than one device is required to isolate the cable.
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