The history of classes and styles of circuits is interesting. Back in 1987, a proposal was accepted to start using Styles of Circuits instead of the Class A and B we were all used to. Well, at least some thought so.
There’s more than just smoke alarms to consider when installing fire protection in houses and apartments. In addition to deciding whether to use ionization or photoelectric smoke alarms, you must determine if you need to install carbon monoxide (CO) alarms or a fire sprinkler system.