The classification system for PVC Electrical Conduit Pipe(Insulated Electrical Conduit for Buildings) is built around the core dimensions of mechanical performance (crush resistance), temperature tolerance, and bending characteristics. It integrates the national standard GB/T43815--2024 and the practical demands of engineering, resulting in the following detailed classification.

1. Classification by Mechanical Performance (Crush Resistance) (Primary Selection Basis)

Based on the ability of the conduit to withstand external mechanical pressure, it is divided into three main categories: Light-duty, Medium-duty, and Heavy-duty. Each category is further subdivided into "-5°C" and "-15°C" types based on minimum temperature tolerance, to suit different climates and installation scenarios.

2. Classification by Bending Characteristics

Based on bendability during installation, it is divided into Cold-bendable and Non-cold-bendable types.

Cold-bendable Rigid Conduit

● Characteristics: Can be manually bent at room temperature (no heating required) using a special bending spring (suitable for diameters: Φ16mm - Φ25mm).

● Applications: Complex turns, ceilings, and wiring within framed walls in residential/commercial projects (high flexibility, efficient installation).

Non-cold-bendable Rigid Conduit

● Characteristics: Large diameter (Φ32mm and above) or high-rigidity pipes that are difficult to bend cold; require the use of bending fittings (couplings, elbows, bends) with solvent cement, or localized heating/softening followed by bending (requires professional equipment).

● Applications: Main trunk lines, large-diameter wiring in public corridors (e.g., trunk lines between distribution panels, main conduits in basements).

3. Classification by Temperature Rating (Implicit in Mechanical Performance Classification)

Based on the minimum tolerance temperature for storage, transportation, installation, and long-term use, it is divided into -5°C grade and -15°C grade.

● -5°C grade: Suitable for regions like North and East China where winter temperatures do not drop below -5°C (e.g., types 205, 305, 405).

● -15°C grade: Suitable for severely cold regions like Northeast and Northwest China (e.g., types 315, 415), ensuring the conduit does not become brittle and performs reliably in low-temperature environments.

4. Classification by Color and Function (Auxiliary Selection)

Common colors are white, red, and blue. Different colors are used to distinguish circuit functions (industry convention):

● White: Main power lines / General lighting circuits.

● Red: Live wire (phase) or important circuits.

● Blue: Neutral wire or low-voltage-related circuits (some brands have custom conventions; consult the design).

Summary of PVC Electrical Conduit Pipe Classification

● Check Load: For surface mount/lightweight walls, choose Light-duty; for standard concealment, choose Medium-duty; for deep concrete embedment, choose Heavy-duty.

● Check Temperature: For severely cold northern areas, choose -15°C grade (315/415); for non-severe cold areas, choose -5°C grade (205/305/405).

● Check Installation: For complex turns, choose Cold-bendable (Φ16-25); for large-diameter trunk lines, choose Non-cold-bendable (Φ32+).

● Check Function: Use colors to distinguish circuits, improving future maintenance efficiency.