I'm explaining how fire alarm systems work for new technicians or other employees who deal with these systems. This is my 13th video in a string of many Khan Academy-styled lessons. This video reviews how 4 wire smoke detectors are wired into a power supervision relay, and it shows how the onboard relay can be used to control auxiliary functions such as door holders/closers and fire lites.
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13 - Four Wire Smokes with On-board Relay - Introduction to Fire Alarms
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