4 - Introduction to Fire Alarm Systems

Описание к видео 4 - Introduction to Fire Alarm Systems

I'm explaining how fire alarm systems work for new technicians or other employees who deal with these systems. This is my 4th video in a string of many Khan Academy-styled lessons. This video reviews the principle of NAC circuits using diodes and reverse polarity to trigger their A/V devices. It also introduces relays, or more specifically, alarm contacts on a fire alarm panel.

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