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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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  • Former Community Member
    0 Former Community Member
    There is no signs of overheating I'm just wondering if its the insulation of the cables that is greater in diameter. That's why I am going to measure the copper cores and also compare to some 2.5mm2 cable. Just seems that if they are 2.5mm2 the radials have been on a 32a MCB all this time.

     Regarding the circuit loading one mcb feeds 6 sockets but the loading is mainly TV's etc . the other mcb feeds the kitchen 5 outlets feeding Fridge, washing machine, toaster etc. I might just change to 20A mcb.

    Thanks for your comments
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  • Former Community Member
    0 Former Community Member
    There is no signs of overheating I'm just wondering if its the insulation of the cables that is greater in diameter. That's why I am going to measure the copper cores and also compare to some 2.5mm2 cable. Just seems that if they are 2.5mm2 the radials have been on a 32a MCB all this time.

     Regarding the circuit loading one mcb feeds 6 sockets but the loading is mainly TV's etc . the other mcb feeds the kitchen 5 outlets feeding Fridge, washing machine, toaster etc. I might just change to 20A mcb.

    Thanks for your comments
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