What are the specifications and models of steel pipe cables?

Steel Pipe Cable Combinations + Cable Conduit: All Specifications and Models (Commonly Used in Engineering)
Steel Pipe Cable = Cable Model + Cable Conduit Specification (SC/JDG/KBG), organized separately for clear reference
I. Cable Conduit Models (Drawing Code + Specifications)
1. SC: Thick-walled galvanized welded steel pipe (fire protection / underground / heavy-duty / pre-embedded; commonly used in Chinese national standards)
Code: SC, galvanized steel pipe for water and gas, wall thickness ≥2.5 mm, can be used as a grounding electrode
Common nominal diameters: DN15, DN20, DN25, DN32, DN40, DN50, DN70, DN80, DN100, DN125
2. JDG Screw-Type Galvanized Thin-Wall Steel Pipe (Ceiling / Concealed Indoor Installation)
Wall thickness: 1.6 mm; screw-type sleeve connection; sizes: Φ16, Φ20, Φ25, Φ32, Φ40
3. KBG Crimp-Type Galvanized Thin-Wall Steel Pipe (Residential / Commercial Exposed Installation, Low-Voltage)
Wall thickness: 1.0–1.2 mm; crimped connection; sizes: Φ16, Φ20, Φ25, Φ32, Φ40
II. Commonly Used Power Cable Types for Steel Pipe Installation (0.6/1 kV Low Voltage)
1. General-purpose power cables (Preferred choice for indoor steel pipe installation)
YJV: Cross-linked polyethylene-insulated, polyvinyl chloride-sheathed power cable (90°C heat resistance, good heat dissipation, standard for steel pipe installation)
YJV22: Steel tape armored, dual protection via direct burial and steel pipe
NH-YJV: Fire-resistant cable (mandatory for fire protection steel pipes)
ZR-YJV: Flame-retardant cable
2. Single-core electrical wires (for lighting/control applications in steel pipes)
BV: Copper-core PVC-insulated rigid wire
BVR: Flexible copper core, easy to bend
3. Standard cross-sectional sizes (mm²)
1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240
Number of conductors: 2-conductor, 3-conductor, 4-conductor, 5-conductor, 3+1, 3+2