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The SPD is undoubtedly the equipment designed to protect the electronics of any building, one of the protections that together with proper grounding and SPDA, are widely used by industry to protect their equipment and people. This research shows the importance of SPD for electrical installations in general, shows that we still do not have the risk of encircling all electrical protections in our homes, which lead to inquiring. Why not use all safety measures in our residential electrical installations, viewed as people who build a bus camera rated by a qualified professional, to guide their client, explaining to him the importance of a safe installation, ie the values with electrical material are still elevated for safe construction. In this research, some brands of SPD were analyzed and compared as to the method of manufacture, classification and prices, a survey that also did not comply with Law No. 11,337, of July 26, 2006. Determines the obligation that the buildings have a system grounding and electrical installations used with the use of conductor protective earth, as well as making the presence of conductor protective earth mandatory in the electrical appliances it specifies. Law 12,119 / 09, of December 15, 2009, amends art. 2 of Law No. 11,337, of July 26, 2006, to better detail the scope of its content and to adapt the nomenclature used to the technical standards used. "Art. 2 Electrical and electronic equipment, with metal housing marketed in the Country, classified in class I, in accordance with the relevant national technical standards, the items allowed for use in earth protection and with plugs, are also allowed in accordance with Brazilian technical standards.
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