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The purpose of this article and those that follow is to discuss the issues relating to electrical safety from design to maintenance. In this article we talk about the basis of the legislation and regulation of the electrical safety. The safety of people and things can not be separated from the rules and laws which must be interpreted and applied correctly. Before discussing the technical issues of electrical safety I need to properly address the legal rules that elect the security against accidents as a right of all citizens and workers in particular.

Generally, especially in the application of the levels prescribed by the current regulations, when it comes to illumination, it means a level of average illumination of the Em, that is the average value of illumination on the working plane of the environment Considered, referring to an average ageing state and during the ordinary exercise of the illuminating equipment, while in the generality of the measures one tends to detect a series of illuminants

A cable is defined as the set of conductors, insulators, sheaths and armor protection or shielding, specifically built to carry the current both for energy transportation and for signal transmission

The operation of making a measurement, is defined as the result of the relationship between a given magnitude and another homogeneous choice as a sample measure unit.