Segurança em edificações: análise e projeto de sistema de proteção contra descargas atmosféricas segundo a NBR 5419

Abstract

A lightning protection system (LPS) is of paramount importance for the safety of individuals, equipment, and buildings. This significance is heightened in Brazil, a country with a high incidence of lightning strikes. Against this backdrop, the primary objective of this study was to analyze a design created in 2007, identify non-conformities, and propose a new design in accordance with the current standard, ABNT NBR 5419:2015. Particular emphasis was placed on the application of risk analysis—a tool not included in the 2005 revision of the standard. The original design underwent a thorough review, and a risk analysis was conducted for the warehouse to determine the actual need for protection. A new design was developed based on the standard and using AutoCAD software. Several non-conformities were identified, such as incorrect cable cross-sections and a lack of protection in specific areas. Conversely, the air-termination system was found to be oversized, resulting in a level of protection exceeding the standard's minimum requirements. Although the modifications were not extensive, the study underscores the importance of keeping an LPS up to date to ensure its reliability and continued functionality over time.