Lightning protection devices: air terminals, down conductors, grounding, surge protectors and other connecting conductors combined.

 
Lightning Sensor: When lightning discharges, electrostatic induction and electromagnetic induction generated in the vicinity of the conductor, it may produce a spark between the metal parts.

EMC: equipment or system has to work properly in an electromagnetic environment without anything in the environment constitute the ability of electromagnetic interference can not afford.

Protective earth: the electrical devices when not charged properly exposed conductive parts connected by grounding type system protection line (PE line) or the protection of neutral (PEN line), known as protective ground.

Surge protector: nonlinear characteristics to limit conduction lines and cause transient overvoltage surge current, and has a non-linear characteristics of the device.