The Old Wiring Rules Resulted In Blind Spots In The Power Supply To Wall Switches.

Electricians often only run the live wire to the junction box. In the era of mechanical switches, the neutral wire runs directly to the lamp holder when the light fixture is controlled by switch Wall Switch. This approach was not a problem. However, when users try to replace the switch with a smart switch, the missing neutral wire in the junction box becomes the biggest obstacle. While single-live-wire power supply technology exists, it easily causes compatibility issues such as flickering when the light is off or malfunctioning when it's on.

Potential Safety Reversal in Lighting Circuits

If the wiring is reversed, hidden dangers arise. When the switch disconnects the neutral wire instead of the live wire, although the wall switch cuts off the circuit and the light goes out, the light fixture itself remains connected to the live wire. At this time, the light fixture is energized. When changing the bulb or performing maintenance, if a person touches the neutral wire or ground, a current path will be created, posing a risk of electric shock. Correct voltage disconnection relies on the live wire going to the switch.

Technological Iteration of Smart Home Underlying Wiring

More and more new buildings are starting to pre-install the live and neutral wires to the switch junction box. This wiring method not only completely solves the power supply problem of single-live smart switches but also provides a stable operating voltage for the wall switch, ensuring that the wireless module does not disconnect or restart. In Europe, some standards even require the use of double-pole switches to simultaneously disconnect the live and neutral wires, achieving a higher level of safety isolation.