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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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  • 0
    Well, if you want to be super-accurate with your micrometer, be careful how you pick it up. Thus we were taught at school.


    I'm with Mike, 3 sf may be the best that you can hope for.


    After retirement, I am beginning to forget the statistical confidence limits for (repeated) measurement, let alone significant change. I reckon that if I am really lucky, on my lathe, I can get within 1/2 thou and under those circumstances I would measure with more than one instrument.


    Now then, does nobody claim that sort of accuracy with an MFT?
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  • 0
    Well, if you want to be super-accurate with your micrometer, be careful how you pick it up. Thus we were taught at school.


    I'm with Mike, 3 sf may be the best that you can hope for.


    After retirement, I am beginning to forget the statistical confidence limits for (repeated) measurement, let alone significant change. I reckon that if I am really lucky, on my lathe, I can get within 1/2 thou and under those circumstances I would measure with more than one instrument.


    Now then, does nobody claim that sort of accuracy with an MFT?
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