BS 6480-1:1969

This British Standard gives requirements and dimensions for impregnated paper-insulated cables for operation up to and including 19 000 V to metal sheath and 33 000 V between conductors. It includes mass-impregnated, mass-impregnated non-draining, and pre-impregnated types of cables. The sheath may be of lead or lead alloy and provision is made for armour and protective coverings.