H05V-K vs H07V-K: Which Flexible Household Cable Is Right for Your Project?

A control panel builder wiring a 230V lighting circuit faces the same H05V-K vs H07V-K choice week after week, and both cables look nearly identical on the spool. Route the H05V-K into a 400V motor feeder and the insulation is operating beyond its certified voltage rating; route the H07V-K into a terminal block sized for a 0.75 sq mm conductor and the fine-stranded copper is too thick to terminate cleanly. This is exactly why the harmonized code printed on the jacket exists, and why engineers need to read it before ordering.

This guide compares H05V-K and H07V-K across designation, ratings, applications, and procurement, so you can specify the right flexible PVC cable on the first purchase order. The cost difference per metre is usually small; the cost of a failed certification is not.

H05V-K and H07V-K Designations Explained

H05V-K and H07V-K are both harmonized European (HAR) flexible single-core cables with PVC insulation and fine-stranded copper conductors; the numerals 05 and 07 are the only characters that separate them, and those numerals set the voltage rating.

The designation follows the HAR system defined in the EN 50525 series, and every character is a specification rather than a brand name:

• H - harmonized European standard cable with an HAR mark of conformity.
• 05 - rated voltage 300/500 V.
• 07 - rated voltage 450/750 V.
• V - PVC insulation compound with a maximum conductor temperature of 70 deg C.
• K - flexible copper conductor, Class 5 per IEC 60228.

Core Technical Differences Between H05V-K and H07V-K

Voltage rating is the decisive technical difference between the two flexible cables; insulation material, conductor flexibility, and maximum conductor temperature are essentially the same because both types comply with EN 50525-2-31.

A 1.5 sq mm H05V-K and a 1.5 sq mm H07V-K carry the same current, but the H07V-K has a thicker PVC wall around the conductor to withstand 450/750 V and a higher test voltage. The extra insulation thickness also improves mechanical margin when the cable is pulled through conduit or bundled into a panel.

In practice, this means H05V-K appears almost exclusively in appliance and luminaire manufacturing, while H07V-K dominates panel shops and electrical contracting.

Where H05V-K and H07V-K Each Belong

Use H05V-K for internal wiring of household appliances, luminaires, and small control circuits that operate below 300 V to earth; use H07V-K for control panels, distribution boards, and fixed wiring inside conduit where circuits can reach 400 V between phases.

This is not a quality difference. Both cables use fine-stranded Class 5 copper and PVC insulation; the practical difference is the certified voltage envelope, and mixing them up creates either an over-specified bill of materials or an under-rated circuit that fails inspection.

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Selection Guide: H05V-K vs H07V-K for Your Project

Match the cable to the circuit rated voltage first, then to the current load and installation method; flexibility is equal in both types, so it should never be the deciding factor.

Engineers in panel shops reduce the decision to three checks that take less than a minute:

1. Check circuit voltage. Measure U0, the voltage between conductor and earth. Above 300 V, H05V-K is excluded.
2. Check current and voltage drop. Size the cross-section by load current; above 1.5 sq mm, H07V-K is the only option in this pair.
3. Check the installation route. Conduit, trunking, tray, or cabinet? H07V-K offers larger sections and thicker insulation for mechanical abuse.

Current-carrying capacity for common H07V-K sections

The values in the ampacity table are reference figures for two loaded conductors, not a substitute for the calculation required by IEC 60364-5-52.

Certification, Marking, and Procurement of H05V-K and H07V-K

A cable is only a genuine H05V-K or H07V-K if its jacket carries the manufacturer name, the HAR mark, and the full designation printed at regular intervals; unmarked or weakly printed stock should be rejected on sight.

When you buy from a cable manufacturer that runs its own extrusion lines, you can request batch-level test certificates instead of relying on distributor brochures. Check three deliverables on every purchase order:

• The EN 50525 conformity declaration with the reaction-to-fire class required by the Construction Products Regulation.
• A batch test certificate that includes conductor resistance measured on the actual coils.
• Reels with clear metre markings, a production date, and the HAR designation repeated along the full length.

A certificate of conformity covers the type, but the batch certificate proves that your specific reels passed the routine tests before dispatch.

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FAQ: Common Questions About H05V-K vs H07V-K