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4mm2 twin and earth cable

Former Community Member
Former Community Member
regarding 4mm2 cable was it ever available in the old colours with solid conductors rather than the 7 strands version? Ive just done a pre - inspection of a property before doing an EICR and found 2 radial circuits fed from 32A MCBS. The cables appear to be  larger than 2,5mm2 . I'm going back to inspect this property with a view to reducing the MCB's to 20A if if they are 2.5mm2. I'm also taking  a Vernier  gauge to measure the cable diameters and compare to reference tables.

The installation is approximately 30 years old but is in very good condition.
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    As a tool a micrometer is better than a vernier for fine measurements. Both are cheap these days. With a micrometer you need to have a bit a practice not too apply too much pressure. Back in the day I did know an engineer who use a micrometer and always declared that round bars always measure about half a thou smaller than flat plates of the same size. His peers used to measure to 1/10ths of a thou approx and some of them without a one tenth thou vernier scale on their mics. I think they used to say that this bloke had the feel of a baby elephant. That was on steel, copper is a bit softer
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    As a tool a micrometer is better than a vernier for fine measurements. Both are cheap these days. With a micrometer you need to have a bit a practice not too apply too much pressure. Back in the day I did know an engineer who use a micrometer and always declared that round bars always measure about half a thou smaller than flat plates of the same size. His peers used to measure to 1/10ths of a thou approx and some of them without a one tenth thou vernier scale on their mics. I think they used to say that this bloke had the feel of a baby elephant. That was on steel, copper is a bit softer
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