Sessize al
US29928463521934
Mediu 10 Ω, 20 Ω ou 30 Ω com o terrômetro? Esse valor sozinho não diz se o aterramento está adequado. No esquema TT, a NBR 5410 estabelece que a proteção contra choques por seccionamento automático deve atender à condição RA × IΔn ≤ UL. E um detalhe importante: o valor de RA não corresponde apenas à resistência do eletrodo medida pelo terrômetro. RA considera o conjunto formado pela resistência do aterramento e pelos condutores de proteção que participam do percurso da corrente de falta. Por is...
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