Rated Voltage 450/750 V and Below XLPE Insulated PVC Sheathed (Flame Retardant, Fire-Resistant) Control Cable

Executive Standards
- GB/T 9330-2020: National standard for plastic insulated control cables.
- Q/320481SS008-2023: Enterprise-specific standard (applicable to non-standard specifications or performance-enhanced products).
- GB/T 19666-2019: General rules for flame retardant and fire-resistant wires and cables or optical cables.

Model Code Definitions
- K: Control cable series code.
- YJ: Cross-linked polyethylene (XLPE) insulation.
- V: Polyvinyl chloride (PVC) sheath.
- R: Flexible conductor construction (stranded fine copper wires).
- P / P2 / P3 / P4: Shielding structure (P-copper wire braid; P2-copper tape wrap; P3-aluminum/plastic composite tape wrap).
- 22 / 32: Armoring structure (22-double steel tape armor; 32-fine steel wire armor).
- Z(A/B/C) / N: Combustion characteristics (ZA/ZB/ZC-flame retardant class; N-fire-resistant property).

Product Specification Range
The conductor uses high-quality annealed copper wire, with specification designs accurately covering various signal and power control requirements:
1. National standard specifications:
   - (2–61) cores × (0.75–2.5) mm²
   - (2–19) cores × (4, 6) mm²
   - (2–7) cores × 10 mm²
2. Enterprise extended specifications (including 0.5 mm² fine diameter and large core count power cores):
   - (2–61) cores × 0.5 mm²
   - (20–37) cores × (4, 6) mm²

Core Technical Parameters
1. Rated voltage (U₀/U): 450/750 V.
2. Rated operating temperature:
   - Maximum continuous permissible conductor operating temperature: 90°C.
   - Maximum conductor temperature during short circuit (max. 5 s): 250°C.
3. Ambient temperature requirements:
   - Ambient temperature during cable installation should not be lower than 0°C; preheating is required if below this temperature.
   - Minimum operating ambient temperature: not lower than -15°C.
4. Bending radius requirements:
   - Non-armored cable: not less than 6 times the cable outer diameter.
   - Armored or shielded cable: not less than 12 times the cable outer diameter.

Product Structural Characteristics
- Advanced insulation technology: XLPE material forms a three-dimensional network molecular structure through physical or chemical cross-linking, significantly improving mechanical strength and chemical corrosion resistance. Its current-carrying capacity is superior to that of standard PVC control cables.
- Effective anti-interference shielding (P series): For precision signal transmission environments, a high-coverage copper wire braid or copper tape wrap shielding structure is adopted to effectively resist external electromagnetic field interference.
- Fire-resistant integrity protection (N type): Fire-resistant cables are provided with a high-performance mica tape fire barrier over the conductor. Under extreme high temperatures during a fire, even if the insulation layer carbonizes, the mica tape maintains isolation between cores, ensuring continuous operation of the control system.
- Durable sheath design: The outer sheath uses high-quality flame retardant PVC material, providing good physical protection, moisture resistance, and tear resistance.

Applicable Scenarios
- Power distribution monitoring: Secondary circuit control and signal transmission within power plants and substations.
- Industrial automation: Automated production line control systems, PLC control cabinets, motor interlock protection circuits.
- Transportation and infrastructure: Fire control and low-voltage monitoring systems in subway tunnels, airport terminals, and intelligent buildings.
- Energy facilities: Control branch circuits in petroleum and chemical parks with higher requirements for temperature rise and mechanical stress.

Selection and Installation Recommendations
1. Current-carrying capacity consideration: Since XLPE insulation can withstand temperatures up to 90°C, its safety current margin is larger than that of standard KVV series cables under the same environment and cross-section.
2. Electromagnetic compatibility design: In locations with high-frequency electromagnetic interference or near variable frequency equipment, it is strongly recommended to select shielded types such as KYJVP or KYJVP2.
3. Armor selection: If the cable needs to be directly buried or faces significant mechanical crushing risks, the steel tape armored KYJV22 type should be selected to ensure physical safety.
4. End protection: During installation, cable ends should be promptly sealed with waterproof treatment to prevent moisture ingress into the cable core and degradation of insulation resistance.