How to Understand Cable Specifications for Industrial Cable Assemblies
How to Understand Cable Specifications for Industrial Cable Assemblies
When selecting industrial cable assemblies, cable specifications are one of the most important details to confirm. A cable may look simple from the outside, but its internal structure directly affects signal transmission, power capacity, flexibility, durability, and long-term reliability.
For machine vision systems, industrial automation equipment, sensors, robots, PLC systems, code readers, and custom wire harnesses, choosing the correct cable specification helps reduce signal problems, installation errors, and equipment downtime.
This article explains the key points engineers and buyers should check when reviewing cable specifications.
1. Wire Gauge: AWG and mm²
Wire gauge describes the conductor size inside the cable. It is often shown in AWG or mm².
AWG is commonly used in North American standards, while mm² is more common in many international cable specifications. In general, a larger conductor cross-section can carry more current, but it may also make the cable thicker and less flexible.
For example, signal cables may use smaller conductors such as 26AWG or 24AWG, while power cables usually require larger conductor sizes depending on the current requirement.
When choosing conductor size, it is important to consider current, voltage drop, cable length, installation space, and flexibility.
2. Number of Cores and Pairs
Cable specifications often show the number of cores or pairs, such as:
4C: four cores
2P: two twisted pairs
4 × 0.34mm²: four cores, each 0.34mm²
4 × 2 × 0.25mm²: four pairs, each conductor 0.25mm²
For signal transmission, twisted pairs can help reduce noise and improve transmission stability. For industrial Ethernet, machine vision, sensors, and control signals, the internal wiring structure should match the equipment interface and signal requirement.
3. Shielding Structure
Shielding is used to protect signals from electromagnetic interference. In industrial environments, cables are often installed near motors, robots, power cables, frequency converters, and control cabinets.
Common shielding structures include:
1. Foil shielding
2. Braided shielding
3. Foil + braided shielding
4. Overall shielding or individual pair shielding
For machine vision cables, industrial Ethernet cables, encoder cables, sensor cables, and code reader cables, shielding is especially important for stable signal transmission.
When reviewing a cable specification, it is necessary to check not only whether the cable is shielded, but also how the shielding is connected to the connector or grounding structure.
4. Jacket Material: PVC, PUR, TPU and Others
The cable jacket protects the internal conductors from mechanical stress, oil, dust, moisture, and environmental damage.
Common jacket materials include:
PVC: widely used, cost-effective, suitable for many static applications
PUR: better abrasion resistance, oil resistance, and flexibility
TPU: flexible and durable, often used for demanding industrial environments
For moving equipment, robots, drag chains, and harsh industrial applications, jacket material should be selected carefully. A cable that works well in a fixed installation may not be suitable for repeated bending or continuous movement.
5. Cable Outer Diameter
Cable outer diameter, usually shown as OD, affects installation, connector compatibility, bending performance, and cable routing.
If the cable OD is too large, it may not fit the connector, cable gland, or equipment space. If the OD is too small, it may not provide enough mechanical strength or may not match the sealing structure of the connector.
For custom cable assemblies, cable OD must be checked together with connector size, strain relief, molding structure, and installation environment.
6. Voltage and Current Rating
Cable specifications should also match the electrical requirements of the application. Voltage rating and current capacity are important for safety and long-term performance.
A cable used for signal transmission may not be suitable for power supply. A cable with insufficient conductor size may cause voltage drop, heating, or unstable equipment operation.
Before selecting a cable, engineers should confirm the working voltage, current requirement, cable length, and operating temperature.
7. Flexibility and Bending Requirements
Some cables are used in fixed installations, while others are used in moving applications such as robots, drag chains, inspection machines, and automated handling systems.
For moving applications, flexibility is critical. Important factors include conductor structure, insulation material, jacket material, bending radius, and drag chain performance.
Using the wrong cable in a moving application may cause conductor breakage, shielding damage, or intermittent signal failure after long-term use.
8. How to Choose the Right Cable Specification
When selecting cable specifications for an industrial cable assembly, it is useful to confirm the following information:
1. Application environment
2. Signal type or power requirement
3. Connector type
4. Cable length
5. Wire gauge or conductor size
6. Number of cores or pairs
7. Shielding requirement
8. Jacket material
9. Cable OD
10. Static or moving installation
11. Testing requirements
Correct cable specification helps improve product reliability, reduce installation problems, and support long-term equipment operation.
ADAMICU Custom Cable Assembly Support
ADAMICU provides industrial connectors and custom cable assemblies for machine vision, industrial automation, robotics, PLC and I/O systems, code readers, industrial Ethernet, and new energy applications.
We can support different cable specifications according to customer drawings, samples, or application requirements, including conductor size, core number, shielding structure, jacket material, cable length, connector type, and wiring definition.
Our cable assembly solutions include M8/M12/M16 circular connector cables, D-Sub cable assemblies, industrial Ethernet cables, machine vision cables, code reader cables, sensor cables, robot cables, terminal wires, open-end cables, and customized industrial wire harnesses.
Before shipment, we can provide continuity testing, insulation testing, appearance inspection, and other customer-specified quality checks.
Conclusion
Cable specifications are not only technical details. They directly affect signal stability, current capacity, connector compatibility, installation efficiency, and long-term reliability.
For industrial applications, the right cable specification should be selected based on the actual equipment, working environment, electrical requirement, and mechanical condition.
Choosing a suitable cable and connector assembly from the beginning can help reduce failures, save installation time, and improve overall system performance.
