If you’re working with control systems, automation panels, or industrial wiring, you’ve probably come across YY cable. But how do you know if you’re choosing the right one? and is it compliant with UK safety standards?
While YY cables are widely used across commercial and industrial settings, not all of them meet strict installation or compliance standards. This guide covers everything from applicable standards and safety obligations to certification schemes and best practices, giving you confidence that your control cable setup is both safe and compliant.
Table of Contents
- What is YY Cable?
- Key Industrial Cable Standards
- Safety & Compliance Obligations
- Certification Schemes & Bodies
- How to Choose Compliant YY Cable
- Installation & Maintenance Best Practices
- Frequently Asked Questions
- Conclusion
What is YY Cable?
YY cable is a flexible, unshielded PVC-insulated and sheathed control cable commonly used in industrial applications. It’s ideal for linking machinery, production lines, and control panels in dry, indoor environments.
The name “YY” reflects the use of PVC (polyvinyl chloride) for both the inner insulation and the outer sheath. It does not contain any kind of screening or armouring, which makes it different from other control cables like SY (steel braid) or CY (copper braid). This flexibility and simplicity make it perfect for applications with light mechanical stress.
Key Industrial Cable Standards
1. BS EN 50525-2-11
This standard applies to flexible PVC-sheathed cables with voltage ratings up to 300/500 V. Many YY cables fall under this classification, but it’s important to note this does not cover screened variants like SY or CY. Always verify whether your specific YY cable meets this standard.
2. IEC 60228
This international standard defines conductor classes, such as Class 5, which refers to fine stranded copper conductors. YY cables are typically made with Class 5 conductors for optimal flexibility.
3. EN 50525-1 (VDE Standards)
This outlines general requirements for electrical cables. While not specific to YY cable, many manufacturers ensure YY types adhere to this standard to maintain quality and performance.
4. BS 7671 (IET Wiring Regulations)
While YY cable is widely used, it’s not generally recommended for fixed wiring unless specific risk assessments are conducted. According to Reg 511.2, you must demonstrate that the cable meets safety expectations equivalent to harmonised standards like BS 6004.
Safety & Compliance Obligations
Using YY cable is also about meeting legal and safety obligations.
1. Regulatory Compliance
BS 7671 requires that any cable used in fixed installations must either comply with a harmonised standard or be demonstrated (via documentation) to be equally safe. This means risk assessments, design notes, and engineer sign-offs are required if using YY cable in such scenarios.
2. Material Safety
Standard PVC sheathing can emit toxic smoke if burned. If your application is in public buildings or enclosed spaces, always choose a Low Smoke Zero Halogen (LSZH) version of YY cable.
3. Mechanical Protection
YY cable does not provide additional physical protection. If your environment involves vibrations, heavy equipment, or sharp edges, you’ll need alternatives like SY or CY cables.
Certification Schemes & Bodies
1. BASEC Certification
BASEC (British Approvals Service for Cables) offers a provisional standard for PVC and LSZH variants of YY cable. Look for BASEC marks as proof of quality and performance testing.
2. BSI Kitemark
Some manufacturers independently certify their YY cables with the BSI Kitemark, confirming that the product meets BS EN 50525-2-11 or other relevant standards. This gives added confidence in safety and quality.
3. Manufacturer Declarations
Reputable suppliers like Cleveland Cable, Eland Cables, and FS Cables often provide full datasheets and declarations of conformity, showing compliance with key British and European standards.
How to Choose Compliant YY Cable
When selecting a YY cable for industrial use, here are five things to check:
- Standards Compliance
Look for BS EN 50525-2-11 or VDE standard mentions on datasheets. - Certification Labels
BASEC and BSI Kitemark labels indicate independently verified safety. - Material Type
Choose LSZH where fire safety and low emissions are required. - Mechanical Requirements
If more physical protection is needed, SY or CY may be more appropriate. - Documentation
Ask for full technical datasheets and compliance documentation to support installation assessments.
Installation & Maintenance Best Practices
1. Risk Assessment
If using YY cable in a fixed installation, perform and document a risk assessment. Justify how the cable meets BS 7671’s safety requirement Reg 511.2.
2. Avoid UV Exposure
PVC degrades under sunlight, so use conduit or trunking for outdoor or UV-prone areas.
3. Regular Inspection
Check for signs of mechanical damage or aging. PVC sheaths may become brittle over time.
4. Use Proper Glands
Especially in high-vibration or hazardous areas, secure YY cable with the right glands and strain reliefs.
5. Label Clearly
Mark cables with date of installation, certification status, and voltage rating for easy maintenance and inspections.
Frequently Asked Questions
1. Can I use YY cable in domestic wiring?
Not usually. YY cable is typically not compliant for domestic fixed wiring unless full safety justifications are made and documented.
2. What is the typical voltage rating?
Most YY cables are rated at 300/500 V, with temperature ratings from –20 °C to +80 °C (static) and up to +70 °C (flexing).
3. Is YY cable fire safe?
Standard versions emit toxic smoke. Use LSZH types for safety in public or enclosed spaces.
4. Does YY cable offer EMI protection?
No. If shielding is required, use CY cable, which has a copper braid.
Conclusion
YY cable remains a highly flexible and efficient solution for control and signal wiring, but it must be used wisely. While it doesn’t meet harmonised fixed wiring standards outright, it can still be compliant with the right documentation and installation practices. Always check certification, ensure proper use cases, and consult qualified professionals before installation.
When chosen and installed correctly, YY cable offers excellent flexibility, durability, and performance across a wide range of industrial and commercial applications.
