2491B / 6701B H05Z-K & H07Z-K LSZH Single Core Cable EN 50525-3-41 Low Smoke Zero Halogen Panel Wiring Cable 300/500V & 450/750V
Application | LSZH panel wiring for appliances with maximum operating temperatures of 90°C, suitable for areas such as public and government buildings where smoke and toxic fumes may threaten life and equipment. No corrosive gases when burnt. |
Voltage Rating Uo/U | H05Z-K (0.5–1 mm²): 300/500V |
Temperature Rating | -25°C to +90°C |
Minimum Bending Radius | Up to 35 mm²: 4 × overall diameter |
Conductor | Class 5 flexible copper conductor |
Insulation | LSZH (Low Smoke Zero Halogen) |
Insulation Colour | Red, Black, Blue, Orange, White, Yellow, Green/Yellow, Grey, Brown, Violet, Pink |
Third-Party Accreditation | BASEC approved; tested and certified by BASEC (British Approvals Service for Cables) |
Standards | EN 50525-3-41, EN 60228 |
DIMENSIONS
ELECTRICAL CHARACTERISTICS
Low Smoke Zero Halogen (LSZH) cables are no longer optional in many modern buildings. Among them, 2491B / 6701B H05Z-K & H07Z-K single core cables have become a standard solution for safe panel wiring, control cabinets, and public infrastructure projects.
But what exactly do these models mean, how do they differ, and why are they widely specified under EN 50525-3-41?
What Do 2491B, 6701B, H05Z-K and H07Z-K Actually Mean?
What is the difference between 2491B and 6701B designations?
2491B and 6701B are traditional British cable references
They correspond to:
H05Z-K → 300/500V
H07Z-K → 450/750V
Both are single core, flexible, LSZH insulated cables
Fully harmonised under EN 50525-3-41
In practice, engineers today focus more on H05Z-K vs H07Z-K, while 2491B / 6701B are still used in tender documents and legacy specifications.
How Is H05Z-K Different from H07Z-K?
Which voltage class should I choose for my application?
Item | H05Z-K | H07Z-K |
|---|---|---|
Rated Voltage | 300/500V | 450/750V |
Conductor Size Range | 0.5 – 1.0 mm² | 1.5 – 240 mm² |
Typical Use | Control wiring, appliances | Power & panel wiring |
Mechanical Stress | Medium | Medium to high |
Installation Environment | Panels, enclosures | Panels, trays, cabinets |
Rule of thumb (used widely in Indonesia):
Use H05Z-K for internal control circuits
Use H07Z-K for power distribution inside panels
Where Are 2491B / H05Z-K & H07Z-K Commonly Used?
Typical applications in Indonesia include:
LV switchboards & distribution panels
Control panels for manufacturing lines
HVAC control systems
Fire alarm & safety systems
Railway stations & airports
Commercial buildings & malls
What Is a Real Indonesian Case Study for LSZH Panel Wiring?
How are H07Z-K cables used in Indonesian public buildings?
Project: Government office complex, Jakarta
Application: Main LV panels & sub-distribution boards
Cable Used: H07Z-K 1.5–70 mm²
Reason for Selection:
LSZH compliance for public safety
EN 50525 harmonisation accepted by consultants
Easy termination and routing
Reduced smoke risk during fire events
Result:
✔ Passed fire safety inspection
✔ Improved panel neatness
✔ Lower long-term maintenance issues
What Installation Best Practices Should Be Followed?
How can installers avoid common mistakes?
Use correct lug size for fine-stranded Class 5 conductors
Avoid over-tightening terminals
Respect bending radius
Separate power and control circuits
Label cores clearly (wide color range available)
Frequently Asked Questions (FAQ)
Is H05Z-K suitable for fixed installation?
Yes, especially inside panels and enclosures.
Can H07Z-K be used in cable trays?
Yes, particularly under Reference Method F or G.
Is LSZH mandatory in Indonesia?
Not always mandatory, but strongly recommended in public and commercial buildings.
Can these cables replace PVC singles?
Yes, and increasingly they are preferred due to safety benefits.
Are these cables suitable for outdoor use?
Only when protected inside enclosures or conduits.
Why Choose BASEC-Approved H05Z-K & H07Z-K Cables?
International acceptance
Stable quality
Trusted by EPC contractors
Meets global fire safety trends
Suitable for export-oriented projects in Indonesia
How to Select the Right LSZH Single Core Cable for Your Project?
If you are:
Designing LV panels
Supplying electrical equipment
Working on public or commercial buildings
Exporting control panels internationally
Choosing the correct H05Z-K or H07Z-K cable is a safety and quality decision, not just a cost decision.
👉 Contact a professional LSZH cable supplier
👉 Request technical datasheets and samples
👉 Match conductor size to real installation conditions
