Smoke detectors are one of those amazing inventions that, because of mass production, cost practically nothing. You can get a smoke detector for as little as $7. And while they cost very little, smoke detectors save thousands of lives each year.
In fact,it is recommended that every home have one smoke detector per floor.All smoke detectors consist of two basic parts: a sensor to sense the smoke and a very loud electronic horn to wake people up. Smoke detectors can run off of a 9-volt battery or 120-volt house current.
In this article, we will examine the two most common types of smoke detectors used today: photoelectric detectors and ionization detectors. And, we'll also take a look inside an ionization detector.
Independent Fire Smoke Alarm Detector CE/RoHS Approved
The detector is suitable for detect the smoke in house, shop, hotel, restaurant, office building, school, bank, library, computer house and storehouse etc. Standalone surface mounted, easy operate, Built-in IC card, stable performance, high sensitivity Apply optical smoke test room, With buzzer, alarm independently, 9V battery, static current: ≤10uA, alarm current: ≤12mA, Low power alarm, Alarm volume: ≥85dB, Temperature range: -10~50?C, Humidity: ≤95%RH, Size: Φ107X34MM
How to Install a Hardwired Smoke Alarm Part 3
A new smoke alarm is mounted and wired in the suspended drywall ceiling for the basement living room using an old work electrical box. NM-B 14/3 cable is pulled from an existing smoke alarm to power and interconnect the new smoke detector.
Install the Old Work Electrical Box in the Drywall Ceiling
After pulling NM-B 14/3 cable along the floor joists and fastening it with insulated cable staples every 4 or 5 feet, I wedged myself into the crawlspace above the finished basement and reached out as far as I could to position the electrical box on the suspended drywall ceiling above the basement living room.
The smoke alarm must be at least 4 inches away from the walls and I?m at least 2 feet away here.I positioned the old work electrical box parallel to the metal stringers and traced the outline of the box on the drywall ceiling with an pen. The box outline is highlighted in red for better viewing. Note: Do not trace around the tabs on the ends of the old work box because the tabs must seat against the face of the drywall to so the box doesn't pull through the drywall mounting hole.
I slipped the old work electrical box in the drywall ceiling to ensure it would fit when I installed the bop from the finished side of the ceiling. It fit perfectly the first time.
Note how the four plastic tabs prevent the old work box from falling through the mounting hole: The NM-B 14/3 wires are cut so at least 6 inches extends into the box and at least 3 inch extends past the box. Only 1/2 inch of insulation is stripped from the wires ends to match the exposed wire of the Kidde PI2010 AC Quick Connect Harness.
Notice the copper ground wire is wrapped out of the way since it?s not used and there?s nothing for it to connect to on this terminating circuit. Plastic electrical boxes do not require grounding. (Metal junction boxes must be grounded with a green ground screen and ground wire pigtail.)I?ve set two flat head 8/32 thread by 3/4? long screws in the box ends to secure the smoke alarm trim plate. The old work electrical box doesn?t include these screws so you?ll have to provide your own:This detector has no wireless transmitter module, it is a standalone smoke detector fire alarm, it will NOT react or pair with your home burglar alarm system. For home burglar alarm smoke detector