… Electrical apparatus for switching or protecting electrical circuits, or for making connections to … arresters, voltage limiters, surge suppressors, plugs and other connectors, junction boxes), for a voltage exceeding …
Explanatory notes
… arresters, voltage limiters, surge suppressors, plugs and other connectors, junction boxes), for a voltage exceeding … to earth in the event of exceptionally high voltages which otherwise would damage the line or electrical installation. …