One, what are the red, blue, and green PVC through-wall pipes?
Red conduits for power, blue conduits for low-voltage, and green conduits for ground. This effectively isolates the electromagnetic interference from power lines on low-voltage systems, preventing interference between household power and low-voltage systems, while also simplifying wiring installation, making it easier for installers to identify and manage power and low-voltage cables, facilitating repairs and future home wiring upgrades, and preventing safety hazards caused by the inability to distinguish between power and low-voltage systems.
Two. Why are conduit pipes colored red and blue?
Initially, PVC conduits were uniformly white in color. During construction and maintenance, workers often struggled to distinguish between power and control wires, leading to unnecessary rework. This eventually led to the adoption of guidelines that use conduits of different colors to differentiate between electrical wires.
Commonly, PVC conduits are available in two colors: red and blue. A technician on-site informed us that the red conduit contains power cables, while the blue conduit contains low-voltage cables. The distinct color difference between red and blue allows for easy identification of power and low-voltage cables, preventing potential hazards during installation.
The reason for separating strong and weak electrical signals is that they can interfere with each other, leading to unstable or weak signals in the home. Therefore, experienced electricians will always wrap the junction of strong and weak electrical wires with aluminum foil to prevent the weak signal from being affected by the strong signal.
In addition to the main and auxiliary power cables, we also found some green and black conduits. After consulting with the technician, I realized that, due to the three-phase four-wire power supply system commonly used in China, an additional ground wire is usually added outside the main and auxiliary power cables to prevent electric shock hazards during power usage. The color of the ground wire conduits typically uses yellow or green.