Electric wires and cables; connections for electric lines, also cable screws; electric cable channels; identification threads for cables; identification sheets for cables and sheets for electric lines; wire connectors (electricity); electric terminals; pipes for electric lines; fibre-optic cables; measuring apparatus, also measuring apparatus for the length of cables; electric relays; electric switches; printed circuits; luminous signs; electric drag chains for cables; connection parts, especially junction sleeves for electric cables; distribution boxes (electricity)