Paper Insulated Lead Covered Service Cables

The service cables below where used on the network prior to the introduction of plastic cables.
Cable Construction
A. Copper conductors – 2 or 4 core versions
• Range of conductor sizes on the network 4 - 35mm2
• 2 core overall diameter range between 19 – 24.6mm
• 4 core overall diameter range between 22 – 31.9mm
B. Layers of paper insulation impregnated with mineral oil compound – thickness 1.0 to 1.2mm between the conductor and sheath
C. Additional (belt) insulation layer
D. Lead sheath, covered with bitumen coated paper and hessian layers, as a bedding for the armour wires
E. Steel tape armours
F. Bitumen coated hessian tape serving (oversheath)