About a week ago, giving a quick look at Google+, I found at a very attractive animated GIF. It showed a number of black balls orbiting around the points of a lattice. These balls were rotating all together, each with an angle slightly offset with respect to the nearby. The whole appeared as a wave that flows through a surface.
Generally, when we talk about of illuminance we refer to the operating average illuminance Em, especially in the application of the levels prescribed by the regulations in force. This value is the average illuminance on the worktop in the environment considered, referring to an intermediate aging state and acquired during the ordinary lighting.
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.
Throughout my career as a designer of electrical installations and technical manager of various companies, I have often heard it said, especially by insiders: “the mains voltage is 220 volts”, or to receive documents with the units of measurement written incorrectly, incomplete and, sometimes even absolutely incomprehensible.