When Fault Protection Fights an Appliance

There is a difference between a breaker that trips because a circuit is genuinely overloaded and one that trips because a protective device is reacting to something it was designed to react to. The second kind is frustrating precisely because nothing appears to be wrong. Ground-fault protection watches for an imbalance between current going out… Continue reading When Fault Protection Fights an Appliance

How Interconnected Smoke Alarms Are Wired

Requirements for smoke alarms in dwellings have changed considerably over the decades, and the differences between a house wired in different eras are substantial. The oldest homes have no wired alarms at all, only battery units added later by occupants. Somewhat newer construction has hardwired alarms with no interconnection, so an alarm in the basement… Continue reading How Interconnected Smoke Alarms Are Wired