YY cable is a flexible, unscreened control cable used for signal and power in automation, building systems, and industrial machinery. It’s a go-to choice when reliability and neat cable management are needed — especially in fixed or lightly flexing installations.
This guide breaks down what YY cable is, where it’s used, the key standards, and how to choose the right type.
Table of Contents
- What Is YY Cable?
- Typical Uses of YY Control Cable
- YY Cable Specification and Construction
- Standards and Certifications for YY Cable
- How to Choose the Right YY Cable
- Frequently Asked Questions
- Conclusion
What Is YY Cable?
YY cable is a type of unscreened, flexible control cable designed for use in industrial automation, signal transmission, and control systems. Known for its versatility, the YY control cable features a plain stranded copper conductor, PVC insulation, and a PVC sheath — typically grey in colour.
The term “YY” denotes that the cable is unscreened and sheathed, and unlike CY or SY cables, YY cables are primarily used in low-interference environments.
YY cables are commonly used to connect control panels to equipment, especially when movement or vibration is expected. Their flexibility makes them suitable for installations requiring occasional flexing.
Typical Uses of YY Control Cable
YY cable is widely used in environments where consistent control signals are required without the need for screening. Here are common applications:
1. Industrial Automation
YY cables are ideal for use in machinery and automated systems, where multiple control signals need to be transmitted over long distances.
2. Production Lines
They’re often used on conveyors and production lines due to their resistance to vibration and light mechanical stress.
3. HVAC and Building Controls
YY control cable is also found in commercial building management systems, such as HVAC and lighting controls.
4. Measurement and Instrumentation
Where accurate readings and data collection are necessary, YY cables offer a stable signal connection.
These use cases highlight the versatility of YY control cable in modern industrial and commercial systems.
YY Cable Specification and Construction
Understanding the YY cable specification is key when selecting the right cable for your application.
Key Specifications
| Feature | Specification |
| Voltage Rating | 300/500 V |
| Test Voltage | 3–4 kV |
| Conductor | Class 5 stranded copper (IEC 60228) |
| Insulation | PVC TI2 |
| Outer Sheath | PVC TM2 (Grey) |
| Core Sizes | 0.5 mm² to 16 mm² (up to 120 mm² available) |
| Temperature Range | -5 °C to +70 °C (flexing), -40 °C to +80 °C (static) |
| Bending Radius | 10× outer diameter (flexing), 4× OD (static) |
Construction Details
- Conductor: Class 5 copper for maximum flexibility
- Core identification: Colour-coded or black with printed numbers
- Sheath: Durable grey PVC outer sheath
- Optional features: Some YY cables include an earth core (green/yellow)
These specifications make the YY control cable a safe, flexible, and cost-effective choice for standard industrial environments.
Standards and Certifications for YY Cable
When selecting control cables, compliance with international standards ensures safety and performance.
Common YY Cable Standards
- BS EN 50525-2-11 – European standard for PVC-insulated flexible cables
- IEC 60228 – Specifies conductor classes and resistance values
- IEC 60332-1 – Flame retardant testing
- VDE 0285 / 0295 – German standards for flexible control cables
- RoHS & CE Compliance – Ensures material safety and EU conformity
- BASEC Certification – Available on select cables for guaranteed quality
Always verify that the YY cable meets your industry’s specific safety requirements before installation.
How to Choose the Right YY Cable
Selecting the correct YY cable involves matching the application needs with the right specification and standards.
Step-by-Step Guide:
- Define the voltage & current load – Match your system’s electrical specs
- Determine core count and size – Based on how many signals or power lines are needed
- Assess flexibility needs – For mobile or vibrating machinery, go for fine-stranded options
- Consider the environment – Use conduit or protection in damp, oily, or abrasive conditions
- Ensure standards compliance – Especially for regulated industries
- Installation method – Choose suitable cable glands and ensure correct bending radius
For example, if you’re connecting sensors to a control panel in a vibrating assembly line, you’ll want a YY cable that supports frequent movement, with proper insulation and shielding from dust or moisture.
Frequently Asked Questions
1. What is YY cable used for?
YY cable is used for control and signal transmission in machinery, automation systems, and instrumentation — especially in dry, indoor environments.
2. Is YY cable flexible?
Yes. YY cables are designed to be flexible, thanks to their fine-stranded copper conductors, making them ideal for installations with movement or vibration.
3. What is the voltage rating of a YY cable?
Most YY cables are rated for 300/500 V, with a typical test voltage of 3,000 to 4,000 V.
4. Can YY cable be used outdoors?
YY cable is not UV resistant by default and should only be used outdoors if placed inside protective conduit or trunking.
5. Is YY cable screened?
No. YY cable is unscreened. If electromagnetic interference is a concern, consider using a screened alternative (not within the scope of this article).
Conclusion
YY cable remains a staple solution for connecting control, automation, and signal equipment in industrial environments. With its flexibility, broad specification range, and ease of installation, YY control cable offers a cost-effective answer to most non-screened control wiring needs.
By understanding the yy cable specification, usage scenarios, and compliance standards, you can confidently choose the right product for your setup — whether you’re planning a full-scale industrial upgrade or a simple panel connection.Explore our full cable range and accessories at Batt Cables, or contact us for tailored advice.
