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Uma igesi enobuthi ikhona endaweni etholiwe, umtshina uguqula isignali yegesi ibe yi-voltage noma isignali yamanje bese iyidlulisela kudivayisi ye-alamu. Ithuluzi libonisa ukugxiliswa kwegesi njengephesenti Lomkhawulo Ongaphansi Weziqhumane (LEL) wegesi enobuthi. Uma ukugcwala kwegesi enobuthi kudlula umkhawulo we-alamu osethiwe, i-alamu ezwakalayo nebonakalayo izocushwa ukuze kukhulunywe abasebenzi abasemsebenzini ukuthi bathathe izinyathelo zokuphepha ngesikhathi, ngaleyo ndlela kuvinjwe izingozi zokushiswa nokuqhuma.
Imodeli
S4200