The correct material name for PVC pipe is polyvinyl chloride, a thermoplastic resin material with excellent mechanical properties and a tensile strength of around 60MPa. During the pipe manufacturing process, the addition of certain additives imparts properties such as flame retardancy, resistance to acids and alkalis, wear resistance, and most importantly for conduit pipes, insulation. These superior characteristics have enabled PVC conduit pipes to capture a significant market share. Different application areas require PVC pipes to have various functions, so the use of PVC conduit pipes also varies accordingly. Below, we will explore how to properly use PVC conduit pipes in different settings. 1. For pipes concealed within walls, buried underground in non-combustible materials, and for ordinary residential wiring in rural buildings, PVC conduit pipes that meet the Ministry of Construction standard JG3050-1998 [1] "Insulated Electrical Conduits and Fittings for Buildings" must be used. These should possess certain flame retardant properties and meet physical and mechanical performance requirements, tailored according to specific regions and details. 2. In places with high fire risks, such as hotels, restaurants, shopping malls (large supermarkets), libraries, entertainment venues, and other public gathering places, where wiring is protected through conduits in ceilings and floors containing many combustible and flammable materials, PVC conduit pipes with a higher flame retardancy rating should be selected. 3. For electrical wiring of fire protection power distribution lines and automatic fire alarm systems, the use of flame-retardant PVC conduit pipes that meet industry standards is mandatory. 4. For the renovation of exposed electrical wiring in historic ancient buildings, interior decoration, secondary housing renovations, and the renovation of old buildings where exposed wiring (concealed in ceilings or floors) is necessary, flame-retardant PVC conduit pipes with a combustion performance rating of B1 or higher must be used.

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Carbon steel conduit pipes are made from Q235 seamed steel tubes to produce wire and cable protection pipes, typically with an R=6D product. A larger R means a gentler bend, making it much easier to thread wires through. When connecting carbon steel conduit pipes to straight pipes, a sleeve is used to protect the joint, and the pipe and conduit are welded together to prevent damage to the joint from welding, thereby protecting the internal wires and cables. Common specifications range from DN20 to DN150.