What Is a Smoke Alarm?
A smoke alarm is a device that senses smoke and sounds an alert inside a building. It combines a smoke sensor and a sounder in the same unit. People often call it a smoke detector, although a detector may be a separate part of a larger alarm system.
Quick Facts About Smoke Alarm
- Category
- Fire warning device
- Used for
- Audible smoke alerts
- Common confusion
- Separate smoke detector
- Also called
- Smoke Detector
- Often discussed with
- Smoke Detector Installation
Key Takeaways About Smoke Alarm
- Some alarms connect so other units sound an alert too.
- Power may come from a battery or household wiring.
- Smoke alarms and carbon monoxide alarms detect different hazards.
How Smoke Alarm Works
A smoke alarm uses a sensing chamber to respond to particles in the air. A photoelectric sensor has a light source inside the chamber. Smoke scatters that light toward a sensor, which triggers the alarm. Related service: Smoke Detector Installation.
Related glossary terms: Branch Circuit, Junction Box, Breaker Panel.
An ionization sensor responds to changes in an electrical current inside its chamber. Smoke particles change that current and prompt the alarm to sound. Some models use both sensing methods in the same unit.
Smoke alarms may draw power from a battery or from household wiring. Hardwired models may also have a backup battery. Some alarms connect to other units, so an alert at one unit activates the others.
From the Earth Electric team
When we install smoke alarms, we look at the available power source and the connections between units. We also check the mounting location and follow the alarm maker's instructions for the model. The wiring and mounting details can differ between homes.
Smoke Alarm in Practice: A Real-World Example
A Miami homeowner wants a smoke alarm installed in a room with existing alarm wiring. The installation involves connecting a compatible alarm to that wiring and checking its operation.
Related Services
Related Terms
Branch Circuit
A branch circuit is an electrical circuit that runs from the final circuit breaker or fuse to the outlets or equipment it supplies.
Junction Box
A junction box is an electrical enclosure that holds and protects wire connections.
Breaker Panel
A breaker panel is an electrical enclosure that distributes power to circuits in a building.
Earth Electric
Have Questions About Smoke Alarm?
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