![]() ![]() ![]() Batteries should be checked and replaced periodically to ensure appropriate protection. Often the smoke detectors that are directly connected to the main wiring system also have a battery as a power supply backup in case the facility’s wiring goes out. ![]() Smoke detectors are typically powered by one or more batteries but some can be connected directly to a building’s wiring. Drawing of Ceiling-Mounted Smoke Detector. ![]()
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