Question

The electrician tash the new smoke alarm system last week ?​

Answer 1

• A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household smoke detectors, also known as smoke alarms, generally issue a local audible or visual alarm from the detector itself or several detectors if there are multiple smoke detectors interlinked.

Answer 2

Answer:

Photoelectric alarms are triggered when something (smoke, dust, or bugs) refracts a light source inside the unit. Dual alarms have both types of sensors. Depending on the unit, one or both sensors need to be triggered for the alarm to sound. The NFPA recommends using both types of alarms.