Installation, and more specifically earthing, is a critical aspect of surge protection. Earthing can seem a bewildering subject. Even in the restricted electrical sense of the word, it can mean different things to different people. Fortunately, in the vast majority of cases, only a fraction of the full effects of a direct lightning strike affect equipment cables. Many real-world systems need a connection to the ground.
Mains power is an example.
Lightning is an interaction between the atmosphere and the ground, so these systems may need protection. In this publication, the term 'ground' is applied to the surface of the planet, ie, soil and rock. . . Earth has also been defined as 'the place to which electrons go at the end of their useful lives'. They are thus extremely aged and deserve our utmost respect. This is the principle of the so-called 'Faraday cage'.