Estudo de viabilidade do dimensionamento de cabos de baixa tensão pelo critério econômico

Abstract

The sizing of low voltage electrical conductors is usually based on the assumptions in the standard ABNT NBR 5410: 2004 - Low Voltage Electrical Installations. Taking into account that in this way will always be obtained the smallest possible cross section of the driver, without taking into account the energy loss by Joule effect, that will be dissipated throughout the life of the driver. One way of reducing joule losses is by increasing the nominal cross section of the conductors. The ABNT NBR 15920: 2011 standard helps a lot in this process, considering the size of the cable section to save energy. There are several parameters and variables that must be taken into account to choose the ideal section, but the savings that will be made over its lifespan will compensate the initial higher expenses. This work was based on the study of the norm and research in bibliographies on the subject, besides an application of the norm in a theoretical case, which proved to be feasible from the economic point of view.