For international buyers sourcing PVC insulated cables from China, model names such as H07V-U, H07V-R and H07V-K are familiar—but often misunderstood. While these cables share the same voltage rating of 450/750V and PVC insulation, the letters after “H07V” define conductor construction, not the number of cores. Using the wrong type can lead to installation difficulties, termination issues, and non-compliance with local wiring standards.
What U, R and K really mean
According to the European harmonized standards HD 21 and EN 50525, the suffixes have precise definitions:
- U stands for rigid round conductor, solid. Derived from the German eindrähtig, it refers to a Class 1 solid copper conductor. This construction offers excellent mechanical stability and simple termination, making it ideal for fixed wiring in residential and commercial buildings. In Chinese standards, this corresponds to BV cable.
- R indicates a rigid, round conductor, stranded. It uses a Class 2 stranded copper conductor, which provides better flexibility than solid wire while remaining classified as a rigid conductor for fixed installations. This type is widely used in industrial conduits, distribution boards and trunking systems. The Chinese equivalent is BV(B).
- K denotes a flexible conductor of a cable for fixed installations. Unless otherwise specified, the flexibility conforms to Class 5 of HD 383 / IEC 60228. This fine-stranded construction is designed for compact routing, vibration-prone environments, and termination with ferrules. In the GB system, H07V-K corresponds directly to RV cable.
Why conductor class matters
The conductor classification defined by IEC 60228 determines how a cable behaves during installation and throughout its service life:
- Class 1 (Solid, H07V-U / BV) is cost-effective and easy to terminate, but larger sizes become stiff and harder to pull through multiple bends.
- Class 2 (Stranded rigid, H07V-R / BV(B) balances mechanical strength and flexibility, making it suitable for industrial fixed installations.
- Class 5 (Flexible, H07V-K / RV) is engineered for control cabinets, automation panels, and equipment wiring where space is limited and bending performance is critical.
Using a Class 1 conductor where Class 5 is required can result in broken strands, poor termination quality, and increased installation time. Conversely, specifying a flexible Class 5 cable for general building wiring may be unnecessary and uneconomical.
Correct model mapping
To avoid confusion in international procurement, buyers should use the following accurate对应关系:
- H07V-U = BV (Class 1 solid conductor)
- H07V-R = BV(B) (Class 2 rigid stranded conductor)
- H07V-K = RV (Class 5 flexible conductor for fixed installations)
Procurement best practices
When requesting quotations or reviewing product datasheets, buyers should ensure the following details are clearly stated:
- Standard: HD 21 / EN 50525 / IEC 60227 / GB/T 5023
- Model: H07V-U, H07V-R, H07V-K, BV, BV(B), RV
- Conductor class: Class 1 / Class 2 / Class 5 (IEC 60228)
- Construction: Solid, rigid stranded, or flexible
- Cross-section: 1.5, 2.5, 4, 6, 10 mm², etc.
- Insulation: PVC TI1/TI2, flame-retardant, RoHS-compliant if required
Conclusion
The H07V family is not interchangeable. U means solid rigid, R means stranded rigid, and K means Class 5 flexible for fixed installations. Understanding these definitions allows buyers to specify the right cable for the right application—reducing risk, improving installation efficiency, and ensuring compliance with both European and Chinese standards.
For exporters, presenting these distinctions clearly is not just a technical detail; it is a signal of professionalism and reliability in global cable supply.
