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Olá Gabriel, a simbologia elétrica em território nacional é guiada pela norma ABNT NBT 5444. Todavia, ela foi cancelada e em seu texto justitificativo orienta a consulta às normas IEC60417 e IEC60617. Compartilho 2 links interessantes para que você possa conhecer e aprofundar em sua pesquisa.https://www.iso.org/obp/ui/#iso:pub:PUB400008:en e o link https://webstore.iec.ch/publication/2723