External cables are made up from conductors of solid plain copper insulated with foamed polyethylene. These conductors are twisted into pairs and the required numbers of pairs are laid up into units, which are identified by coloured tapes. The cables are petroleum jelly filled, sheathed in black polyethylene and manufactured in accordance with BT type CW 1128. more
External cables are made up from conductors of solid plain copper insulated with foamed polyethylene. These conductors are twisted into pairs and the required numbers of pairs are laid up into units, which are identified by coloured tapes. The cables are petroleum jelly filled, sheathed in black polyethylene and manufactured in accordance with BT type CW 1128. more