H05V-K and H07V-K are two widely used single-core PVC-insulated flexible cables in building and equipment wiring. At first glance, they may seem similar, but their rated voltages, mechanical properties, and suitable applications differ significantly. For engineers, project managers, and buyers, the real question is not "which is better" but "under what conditions can one replace the other."
This article provides a clear, standards-based comparison and practical guidance to answer: When can H07V-K safely replace H05V-K? Why is it possible in most cases? And what must be verified before doing so? Through a concise yet comprehensive analysis, this guide helps you ensure compliance, safety, and cost efficiency when selecting cables for electrical installations.
What Are H05V-K and H07V-K Cables?
- H05V-K: Rated voltage 300/500 V, consisting of fine stranded copper conductors with PVC insulation. It is commonly used in light-duty wiring, domestic appliances, control cabinets, and low-voltage connections.
- H07V-K: Rated voltage 450/750 V, also made of fine stranded copper conductors with PVC insulation, but designed for higher voltage and mechanical strength. It is suitable for building distribution wiring, industrial panels, and fixed installations.
- Both comply with IEC 60227 or VDE 0281 standards, yet differ in voltage class, conductor cross-section, and application field - the key technical distinctions that determine interchangeability.
Key Technical Differences
| Parameter | H05V-K | H07V-K | Impact on Replacement |
|---|---|---|---|
| Rated Voltage | 300/500 V | 450/750 V | H07V-K provides higher voltage tolerance - usually acceptable as a substitute |
| Common Cross-Section Range | 0.5–2.5 mm² | 1.5–35 mm² | Small sizes may not always be available for H07V-K |
| Insulation & Mechanical Strength | Thinner insulation | Thicker insulation, stronger | H07V-K offers greater durability |
| Flexibility | Very high (small sizes) | High (larger sizes) | Similar flexibility; H05V-K better for tight wiring spaces |
| Temperature Resistance | Standard | Wider operating range | H07V-K is more resistant to heat and aging |
| Typical Standards | Domestic, control panels | Industrial and building wiring | Must meet the local code to be replaceable |
Can H07V-K Replace H05V-K?
Yes - H07V-K can replace H05V-K when the following technical conditions are satisfied:
- Voltage and Insulation Requirements: The application's working voltage does not exceed 450/750 V, and insulation performance is equal to or better than the original design.
- Conductor Cross-Section & Current Rating: The replacement cable must meet or exceed the required current-carrying capacity and withstand short-circuit conditions. Derating for installation method (e.g., in conduit, in air, or in bundles) should be considered.
- Terminal and Connector Compatibility: The conductor flexibility and outer diameter must fit terminals or connectors properly to avoid poor contact.
- Bending Radius & Space Limitations: For compact or frequently bent installations, verify that H07V-K's minimum bending radius is acceptable.
- Compliance with Local Electrical Codes: Always confirm that the replacement meets regional electrical or building standards (IEC/VDE/BS, etc.).
Why replacement is usually possible:
H07V-K offers higher voltage and mechanical ratings, meaning it can safely operate under all conditions that H05V-K handles. It provides additional safety margin and longer service life.
When replacement may not be suitable:
If very small conductor sizes (e.g., 0.5 mm²) are required and unavailable in H07V-K, or if space is extremely limited with terminals designed for ultra-flexible wires, replacement could cause installation issues or noncompliance. Blind substitution without technical verification may lead to overheating or poor terminations.
Advantages of Using H07V-K Cables
- Higher Voltage and Safety Margin: Supports demanding electrical systems safely.
- Greater Mechanical Durability: Thicker insulation enhances protection.
- Improved Longevity: Better resistance to heat, vibration, and aging.
- Reduced Maintenance Needs: Lower risk of insulation damage and downtime.
- Wider Application Range: Ideal for industrial control panels, building wiring, and fixed installations.
When Should You Choose H05V-K Instead?
- Low-voltage or cost-sensitive applications, such as appliance internal wiring or control panels.
- Compact or tight-space installations where ultra-flexible, small cross-section wires are required.
- Temporary or short-term setups where long-term durability is less critical.
In such scenarios, H05V-K remains the more economical and practical option.
How to Choose the Right Cable for Your Project
- Define Electrical Parameters: Voltage, maximum current, permissible voltage drop, and short-circuit conditions.
- Assess Environmental & Mechanical Factors: Exposure to heat, oil, vibration, or chemical agents.
- Check Termination Requirements: Terminal type, crimping method, and minimum bending radius.
- Verify Current-Carrying Capacity: Account for installation method and ambient temperature correction factors.
- Confirm Compliance and Certification: Ensure the cable meets IEC/VDE or local code standards.
- Consult a Professional Supplier: Request samples and technical support before finalizing substitution.
| Feature | H05V-K | H07V-K | Replacement Guidance |
|---|---|---|---|
| Rated Voltage | 300/500 V | 450/750 V | H07V-K provides higher safety margin |
| Typical Use | Appliance wiring, control panels | Building wiring, industrial panels | Replaceable when cross-section and installation allow |
| Cost | Lower | Slightly higher | Long-term cost often lower due to durability |
| Flexibility | Excellent (small wires) | Good (larger sizes) | Check terminal fit before replacing |
Our Product & Service Advantages
Dongguan Greater Wire & Cable Co., Ltd. specializes in high-quality electrical wire and cable solutions for industrial and commercial applications. For both H05V-K and H07V-K, we provide:
- Comprehensive Product Range: Full cross-section coverage with customizable specifications for various replacement or new installation needs.
- Certified Quality: All cables comply with major international standards and third-party testing requirements.
- Professional Engineering Support: Our technical team provides current rating calculations, installation guidance, and connector compatibility checks to ensure safe replacement.
- Responsive After-Sales Service: Quick feedback and field troubleshooting to support both large-scale and small-batch projects.
- Flexible Delivery & Cost Optimization: Competitive pricing and optimized lead times to help customers balance safety, compliance, and budget.
Whether you are an appliance manufacturer, an electrical contractor, or a building systems integrator, Dongguan Greater Wire & Cable Co., Ltd. offers one-stop cable solutions - from consultation and sampling to full production and technical support.
Contact us today:
- Dongguan Greater Wire & Cable Co., Ltd.
- Tel / WhatsApp / WeChat: +86 135 1078 4550 / +86 136 6257 9592
- Email: manager01@greaterwire.com