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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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    I assume the cores are clearly copper, the insulation is normal low temperature PVC, and you are concerned as  they show signs of overheating - what is the expected load ?

    (there was a brief foray into copper coated aluminium, but thankfully that was much earlier (~ 1970-1975), and was rapidly dropped as being hard to work with and prone to sudden failure)


    As far as I know there was not single core 4mm made as standard T and E, but there may have been some special. Early 1990s is quite modern era, its unlikely to be miles out.

    M.
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  • 0
    I assume the cores are clearly copper, the insulation is normal low temperature PVC, and you are concerned as  they show signs of overheating - what is the expected load ?

    (there was a brief foray into copper coated aluminium, but thankfully that was much earlier (~ 1970-1975), and was rapidly dropped as being hard to work with and prone to sudden failure)


    As far as I know there was not single core 4mm made as standard T and E, but there may have been some special. Early 1990s is quite modern era, its unlikely to be miles out.

    M.
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