These types of documents describe technical aspects of the products or of the electrical installation and art rules to ensure electrical safety.
It is obvious that the equipment and the material used in an installation should be safe. This means that they should be in accordance with the relevant standards and that they will not endanger the safety of persons and the conservation of property, when they are installed and maintained in a non-defective condition and when they are used in accordance with their intended purpose.
The electrical equipment will also be selected and installed according to the limitations and the environmental conditions of the place to which it can be subjected.
Because of its hazards and its complexity, rules for the erection of an electrical installation were set up and published in national and international standards. Following these rules will help protect persons during the installation, the operation, maintenance and usage of the electrical installation.
Standards are documents that are established by consensus and give the best practices for a process or a product. They are based on the consolidated results of science, technology and experience and are approved by recognized bodies.
Many countries have their own national installation rules / standards, and they are almost always based on the international standard IEC 60364 series.
It is imperative that the electrical installation is properly designed. The best practice therefore is following the rules laid down in the national or international standards.
A third party should approve the plans, diagrams and calculation notes of the installation before any installation work is carried out.