Voltage spikes occurring as a result of lightning strikes can damage flange insulation, in some cases beyond repair. Isolating spark gaps for aboveground and underground installation are used to indirectly earth and connect functionally isolated parts of installations under lightning conditions. 

YUXI isolating spark gap with suitable connection technology have the task of protecting insulating pieces and flanges against surge voltages and arresting lightning energy without sparks, even when a potentially explosive atmosphere occurs.