T he grounding of electrical systems may be understood on no more than an intuitive level. It does seem to make sense that if lightning strokes go to ground, the electrical system will be made safer by providing an efficient, low impedance path. As such, however, the grounding system might be called upon rarely, or in some locales, never. Actually, it is in constant use because it is involved in a number of functions. To be fully adapted to properly utilizing and maintaining the electrical system, it is a good idea to be aware of the total function.