Complete Guide to Wire & Cable Standards: AWG, UL, and CAT Specifications
Three core independent and complementary standards govern all wire and cable specifications for harness manufacturing: AWG (physical size), UL (material & safety performance), and CAT (data transmission capability). This condensed guide retains all key technical data and simplifies descriptions for quick industrial reference, focusing on mainstream 16–26AWG harness specifications.
1. AWG Standard – Copper Conductor Size
AWG (American Wire Gauge) is a global size standard for bare copper conductors, determining wire current capacity, voltage drop, and processing compatibility. It does not cover insulation, temperature resistance or cable function.
- Core rule: Higher AWG = thinner conductor; lower AWG = thicker conductor.
- Full processing range: 10AWG–30AWG (5.26mm²–0.051mm²)
- Mainstream harness range (16–26AWG exact sqmm):
- • 16AWG = 1.31 mm²
- • 18AWG = 0.823 mm²
- • 20AWG = 0.518 mm²
- • 22AWG = 0.326 mm²
- • 24AWG = 0.205 mm²
- • 26AWG = 0.129 mm²
- Special gauges: 4/0–1AWG (heavy-duty high-current power cables); 28–30AWG (ultra-fine micro wires for precision devices)
16–26AWG wires balance flexibility and electrical stability, widely used for automotive, appliance and electronic signal/power harnesses. All automatic and semi-automatic harness processing equipment is precisely calibrated for standard AWG/mm² dimensions.
2. UL Standard – Material Safety & Environmental Performance
UL standards define wire insulation material, temperature rating, voltage resistance, flame retardancy and mechanical durability. Each UL style represents a fixed industrial specification, while cable selection is determined by customers, not processing equipment.
2.1 Common UL Cable Types & Ratings
- UL1007 / UL1015 (PVC): 80–105°C, 300–600V, general internal appliance wiring
- UL3132 / UL3135 (Silicone): 150–200°C, flexible high-temperature resistant for motors and high-temperature harnesses
- TXL / GXL / SXL (Automotive XLPO): 125°C, oil & abrasion resistant, dedicated for vehicle engine bay harnesses
- UL1332 / UL1727 (FEP/PTFE): 200–250°C, corrosion-resistant, for aerospace and precision industrial equipment
2.2 Core UL Parameters
Covers 80°C–250°C temperature grades, 300V/600V/3300V voltage levels, and VW-1 flame retardancy to ensure long-term harness safety.
3. CAT Standard – Ethernet Data Transmission Performance
CAT (Category) is an exclusive standard for twisted-pair network cables, governing bandwidth, transmission speed and distance. It is independent of AWG size and UL insulation standards.
3.1 Main CAT Series Specifications
- CAT5: 100MHz, 100Mbps (obsolete)
- CAT5e: 125MHz, stable 1Gbps long-distance transmission (basic universal network cable)
- CAT6: 250MHz, 1Gbps@100m / 10Gbps@55m; mainstream industrial gigabit cable with standard 23AWG (0.573mm²) conductor
- CAT6A: 500MHz, full 10Gbps@100m for high-speed industrial Ethernet
- CAT7/CAT8: Ultra-high bandwidth, up to 40Gbps for data centers
3.2 High-Temperature CAT6 Cable
Standard PVC CAT6 only supports 70–80°C. Custom high-temperature CAT6 with UL21618 FEP/PFA insulation achieves 150–200°C heat resistance while maintaining complete CAT6 transmission performance for harsh industrial environments.
4. Standard Differences & Full Specification Rule
- AWG: Defines conductor size, current load and processing adaptability
- UL: Defines wire safety, temperature resistance and service environment
- CAT: Defines network data transmission performance (Ethernet cables only)
Complete wire specification: Ordinary power/signal wires = AWG + UL style; Data cables = AWG + UL standard + CAT grade. Example: 23AWG CAT6 UL21618 high-temperature industrial network cable.
To ensure accurate machine and tool selection and provide professional customized solutions during inquiry, customers are recommended to provide detailed specifications of their final harness products and raw wire materials, including AWG size, UL insulation grade, and CAT cable standards. Based on your actual production requirements, we can precisely recommend the most suitable fully-automatic or semi-automatic processing equipment, matched tools and optimal processing solutions.