La potencia nominal es la potencia máxima que demanda una máquina o aparato en condiciones de uso normales; esto quiere decir que el aparato está diseñado para soportar esa cantidad de potencia, sin embargo debido a fluctuaciones en la corriente, al uso excesivo o continuo, o en situaciones de uso distintas a las del diseño, la potencia real puede diferir de la nominal, siendo más alta o más baja.

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In electrical engineering, mechanical engineering and other disciplines, the power rating of equipment is defined as the highest power input allowed to flow through particular equipment. According to the particular discipline, the term "power" may refer to the electrical or mechanical power. A power rating can also involve average and maximum power, which may vary depending on the kind of equipment and its application. Power rating limits are usually set as a guideline by the manufacturers, protecting the equipment and simplifying the design of larger systems, by providing a level of operation under which the equipment will not be damaged while allowing for a certain safety margin.

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