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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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    In the wiring Regs. 15th Edition of 1981 a standard circuit was allowed. Table 5A applied to sockets.  to B.S. 1363.


    Type A2 circuit allowed a radial circuit covering up to 50m2 area to supply sockets. It was to be fused at 30 or 32 Amps. (Cartridge fuse or circuit breaker).  The cable size was to be 4.0mm2 minimum P.V.C.  Perhaps the installer made a mistake.


    Type A3 radial circuit was to cover no more than 20m2 floor area and could be wired in 2.5mm2 P.V.C. cable and fused at 20 Amps.


    Cables back then were red for line and black for neutral.


    Z.
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  • 0
    In the wiring Regs. 15th Edition of 1981 a standard circuit was allowed. Table 5A applied to sockets.  to B.S. 1363.


    Type A2 circuit allowed a radial circuit covering up to 50m2 area to supply sockets. It was to be fused at 30 or 32 Amps. (Cartridge fuse or circuit breaker).  The cable size was to be 4.0mm2 minimum P.V.C.  Perhaps the installer made a mistake.


    Type A3 radial circuit was to cover no more than 20m2 floor area and could be wired in 2.5mm2 P.V.C. cable and fused at 20 Amps.


    Cables back then were red for line and black for neutral.


    Z.
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