--- title: High Flexibility Wires for Minimum Bend Radius Requirements description: Learn how high-flexibility wires meet minimum bend radius requirements through conductor size, strand count, jacket materials, and cable geometry. image: https://blog.epectec.com/hubfs/blog/high-strand-count-wire-cross-section.jpg --- [![Epec Engineered Technologies](https://www.epectec.com/images/logo.png "Epec Engineered Technologies")](https://www.epectec.com/) [![Epec Engineered Technologies](https://www.epectec.com/images/logo.png "Epec Engineered Technologies")](https://www.epectec.com/) - [Articles](https://www.epectec.com/articles/) - [Blog](https://blog.epectec.com/) - [Webinars](https://www.epectec.com/webinar/) - [Videos](https://www.epectec.com/videos/) - [Case Studies](https://www.epectec.com/case-studies/) - [News & Events](https://www.epectec.com/news/) - [Customer Portal](https://system.netsuite.com/c.406760/site/NSlogin.html) - [About](https://www.epectec.com/about/overview/) - Back - [Company Overview](https://www.epectec.com/about/overview/) - 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[Tweet](https://twitter.com/share) Flexibility is one of the most common requirements driving the development of a [custom cable assembly](https://www.epectec.com/cable-assemblies/). Whether the cable must route through a confined enclosure, accommodate repeated movement, or navigate tight bends during installation, cable flexibility often becomes a critical design parameter. While nearly all cables exhibit some degree of flexibility, not all cable constructions perform equally when subjected to tight bend radii or repeated motion. Wire size, conductor design, strand count, jacket material, and cable geometry all influence how a cable behaves when bent, flexed, or routed through an assembly. Understanding these variables early in the design process helps engineers develop cable assemblies that satisfy mechanical requirements without sacrificing electrical performance. [![Check Out Our Tips on Cable Assembly Design!](https://no-cache.hubspot.com/cta/default/707152/2b2d2d36-33a4-46c5-b3f9-308eff53a644.png)](https://cta-redirect.hubspot.com/cta/redirect/707152/2b2d2d36-33a4-46c5-b3f9-308eff53a644) ## Wire Size Is One of the Primary Drivers of Flexibility The most direct way to increase cable flexibility is to reduce conductor size and overall cable diameter. In general, as wire gauge increases, flexibility improves. A 34AWG wire will typically be more flexible than a 22AWG wire because of its smaller diameter and lower bending stiffness. The table below are examples using UL 1213 PTFE-insulated wire constructions: | UL Spec | Wire Size (AWG) | Strand Count | Nominal OD (mm) | Voltage (V) | Max Temp (°C) | Jacket Material | Conductor Material | | --- | --- | --- | --- | --- | --- | --- | --- | | UL 1213 | 34 | 7 | 0.6 | 150 | 105 | Extruded PTFE | SPC / NPC | | UL 1213 | 32 | 7 | 0.7 | 150 | 105 | Extruded PTFE | SPC / NPC | | UL 1213 | 30 | 7 | 0.8 | 150 | 105 | Extruded PTFE | SPC / NPC | | UL 1213 | 28 | 7 | 0.9 | 150 | 105 | Extruded PTFE | SPC / NPC | | UL 1213 | 26 | 7 | 1 | 150 | 105 | Extruded PTFE | SPC / NPC | | UL 1213 | 24 | 7 | 1.1 | 150 | 105 | Extruded PTFE | SPC / NPC | | UL 1213 | 22 | 7 | 1.3 | 150 | 105 | Extruded PTFE | SPC / NPC | *Wire size summary for PTFE jacketed cable.* When electrical requirements permit a smaller wire size, reducing conductor diameter is often the simplest approach to improving overall cable flexibility. Not every application allows a smaller conductor, particularly when current-carrying requirements dictate larger wire sizes. In these situations, additional cable design variables must be evaluated. ## Understanding Minimum Bend Radius Cable flexibility is often defined through minimum bend radius. The minimum bend radius represents the tightest bend a cable can withstand without causing damage to the conductor, insulation, or cable jacket. A preliminary bend radius is commonly estimated by multiplying the cable outer diameter (OD) by a bend-radius factor. This factor typically ranges from 6× to 12× depending on cable construction and application requirements. Applications involving repeated or severe motion may require design adjustments because cyclic bending can accelerate fatigue within the conductor and cable structure. ### Example Bend Radius Calculation The below table is an example using a bend factor of 12. | Wire AWG | OD (mm) | Factor | Estimated Minimum Bend Radius (mm) | | --- | --- | --- | --- | | 34 | 0.6 | 12 | 7.2 | | 22 | 1.3 | 12 | 15.6 | This example demonstrates how increasing cable diameter directly increases the estimated minimum bend radius. As wire size grows, the cable becomes progressively less flexible. The bend-radius calculations should be treated as rule-of-thumb estimates and that critical applications require physical [validation testing](https://blog.epectec.com/understanding-your-custom-cable-assembly-testing-requirements) before production release. ## Increasing Flexibility Through Conductor Construction When reducing conductor size is not practical, conductor construction may provide another path to improved flexibility. [Stranded conductors](https://blog.epectec.com/cable-assembly-conductor-options-101) are commonly used in electronics applications because they offer a combination of flexibility and current-carrying capability. Rather than using a single solid conductor, stranded constructions use multiple smaller conductors grouped together to form the required wire size. | Individual Strand Size | Stranded Conductor Diameter | Overall Diameter (OD) | Resistance at Ambient | Nominal Weight | | --- | --- | --- | --- | --- | | AWG | mm | mm | ohm/Km | Kg/Km | | 25 | 1.5 | 3.06 | 14.6 | 20.09 | | 29 | 1.5 | 3.06 | 14.6 | 19.7 | | 33 | 1.5 | 3.06 | 14.6 | 20.08 | *Strand count options for 16AWG wire.* Changing the strand count can significantly affect cable flexibility. Higher strand-count constructions often use extremely fine individual strands. Some specialty cable designs contain hundreds or even thousands of strands, allowing the conductor to bend more easily while maintaining the overall electrical characteristics of a larger cable. This approach can create highly flexible conductors capable of supporting current levels typically associated with substantially larger wire sizes. For applications requiring continuous motion or extreme routing flexibility, high strand count conductors may provide advantages over more conventional constructions. Individual strands in specialty conductors can approach the size of a human hair. When bundled together, these fine conductors create a cable that maintains flexibility across a wide range of motion. **This design approach allows engineers to balance two competing requirements:** - High current-carrying capability - Enhanced cable flexibility As flexibility requirements become more demanding, conductor construction often becomes just as important as conductor size. ## Jacket Material Also Influences Flexibility Flexibility is affected by more than the copper conductor. The [cable jacket can also](https://blog.epectec.com/why-use-a-jacketed-cable-in-your-assembly) play a significant role in overall cable performance. There are several jacket materials commonly associated with flexible cable designs, including: - Silicone - PTFE - Softer PVC formulations These materials may improve flexibility while also providing additional performance characteristics. **Depending on the selected material, benefits may include:** - Extended temperature capability - Enhanced fatigue resistance - Improved chemical resistance - Improved UV resistance Selecting the proper jacket material often involves balancing mechanical flexibility with environmental and electrical requirements. ## Alternative Cable Geometries for Space-Constrained Designs In some applications, flexibility challenges cannot be solved through conductor or jacket modifications alone. Custom cable geometries may offer additional design options. **There are several alternatives, including:** - Extruded flat cables - Rectangular cable cross-sections - Other non-uniform cable shapes These constructions can change how a cable bends within an assembly and may improve routing performance in applications with limited installation space. The ability to tailor the cable cross-section for a specific bending direction can provide flexibility benefits that would not be possible with a conventional round cable. ## Evaluating Flexibility Requirements Early in Development Modern power systems, [battery-powered devices](https://www.epectec.com/batteries/), and compact electronic assemblies often require cables to route through increasingly confined spaces while maintaining reliable electrical performance. ![High strand count wire cross section.](https://blog.epectec.com/hs-fs/hubfs/blog/high-strand-count-wire-cross-section.jpg?width=800&name=high-strand-count-wire-cross-section.jpg) *High strand count wire cross-section.* **Meeting these requirements typically involves evaluating several interconnected design variables:** - Wire gauge - Conductor strand count - Cable outer diameter - Jacket material - Cable geometry - Minimum bend radius Because flexibility requirements are highly application-specific, evaluating these factors during prototyping can help reduce risk before production tooling and manufacturing activities begin. ## Summary Highly flexible cable assemblies rarely rely on a single design feature. Successful designs often combine appropriately sized conductors, optimized strand constructions, suitable jacket materials, and cable geometries that support the required routing path. Minimum bend radius calculations provide a useful starting point, but real-world validation remains important for applications where cable flexibility is critical to product performance. By evaluating conductor design, material selection, and cable construction early in development, engineers can improve the likelihood of achieving both flexibility and long-term reliability requirements. --- ## Key Takeaways - **Wire size directly impacts flexibility**, with smaller gauge (higher AWG) wires offering greater flexibility, making them ideal for applications requiring tight bends and frequent motion. - **Minimum bend radius is a critical design factor**, ensuring cables can be bent without damaging conductors, insulation, or shielding, which is essential for reliability in high-flex applications. - **Stranded conductors improve flexibility**, with higher strand counts allowing cables to bend more easily while maintaining current-carrying capacity, making them ideal for power and signal applications. - **Jacket material selection enhances performance**, with high-flexibility materials like PTFE, silicone, or soft PVC providing increased durability, temperature resistance, and improved fatigue life. - **Custom cable designs optimize flexibility and routing**, with options such as extruded flat cables, rectangular cross-sections, and non-uniform shapes improving bend characteristics in space-constrained applications. - [Tweet](https://twitter.com/share) Topics: [Cable Assemblies](https://blog.epectec.com/topic/cable-assemblies) --- [Next](https://blog.epectec.com/integrating-gpio-options-in-your-custom-battery-pack) | [All posts](https://blog.epectec.com/all) | [Previous](https://blog.epectec.com/custom-bms-vs-off-the-shelf-bms-features-and-limitations) [![New Call-to-action](https://no-cache.hubspot.com/cta/default/707152/8ffdc9d0-20f3-4d7f-97bd-b552944e13be.png)](https://cta-redirect.hubspot.com/cta/redirect/707152/8ffdc9d0-20f3-4d7f-97bd-b552944e13be) ## Leave a Comment --- ## Related Posts --- ### Recent Posts --- ### Posts by Topic - [Printed Circuit Boards (162)](https://blog.epectec.com/topic/printed-circuit-boards) - [Product Design (139)](https://blog.epectec.com/topic/product-design) - [Battery Packs (122)](https://blog.epectec.com/topic/battery-packs) - [Cable Assemblies (103)](https://blog.epectec.com/topic/cable-assemblies) - [Flex & Rigid-Flex PCB's (97)](https://blog.epectec.com/topic/flex-rigid-flex-pcbs) - [Electronics Industry (61)](https://blog.epectec.com/topic/electronics-industry) - [User Interfaces (55)](https://blog.epectec.com/topic/user-interfaces) - [Quality Solutions (33)](https://blog.epectec.com/topic/quality-solutions) - [Flexible Heaters (31)](https://blog.epectec.com/topic/flexible-heaters) - [Events, Training, and Support (9)](https://blog.epectec.com/topic/events-training-and-support) - [RF Products (7)](https://blog.epectec.com/topic/rf-products) - [CNC Machining (3)](https://blog.epectec.com/topic/cnc-machining) - [Fans & Motors (1)](https://blog.epectec.com/topic/fans-motors) See All --- --- ### Need Help with A Project? 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