Heavy Duty High Temperature Power Cable for Industrial Machinery
Heavy duty high temperature power cable provides the high-current power supply connection to industrial furnaces, smelting equipment, induction heating systems, and other heavy-duty industrial heating machinery where the power cable must carry large continuous currents while withstanding sustained ambient temperatures of 200°C to 450°C at the cable routing point. This is a large cross-section power cable — from 6 mm² to 240 mm² per conductor — rather than a small-AWG control cable, and is used for the main power feed to heating elements, electrode systems, and high-power induction coils in the most demanding industrial heating applications.
The cable construction combines a high cross-section copper conductor (selected for low resistance and high current capacity) with a high-temperature insulation system — silicone rubber (200°C, UL AWM Style 3135) for applications in the 100–200°C range, or mica tape (450°C, UL AWM Styles 5107 and 5128) for the most extreme furnace and smelting environments — providing a complete cable solution rated for the actual electrical and thermal demands of heavy industrial power delivery in high-temperature machinery.
Technical Specifications
| Parameter | Silicone version | Mica tape version |
|---|---|---|
| Temperature rating | –60°C to 200°C | 200°C to 450°C |
| Voltage rating | 600V AC | 300V / 600V AC |
| Conductor cross-section | 6 mm² – 240 mm² | 6 mm² – 120 mm² |
| Conductor material | Stranded copper, Class 5 flexible | Stranded copper, solid options |
| Core insulation | Extruded silicone rubber (VMQ) | Non-extruded mica tape |
| Outer sheath / covering | Silicone rubber outer sheath | Treated fiberglass braid |
| Core configuration | Single core or 2–4 core | Single core or 2–3 core |
| UL style | 3135 (File E333030) | 5107 / 5128 (File E333030) |
| Current capacity (120mm²) | Up to 300A (free air, 200°C) | Up to 280A (free air, 450°C) |
| Standard | UL AWM 3135, GB/T 12528, RoHS | UL AWM 5107/5128, GB/T 13033, RoHS |
Key Features
- Large cross-section for high-current applications — 6 mm² to 240 mm², up to 300A continuous in free air
- 200°C (silicone) to 450°C (mica tape) — select insulation based on cable routing temperature
- UL AWM 3135, 5107, 5128 recognised — File No. E333030
- Flexible stranded copper conductor — silicone version with Class 5 stranding for routing flexibility
- Silicone outer sheath — oil, ozone, and UV resistant; withstands furnace enclosure surface contact
- Mica tape version fire-rated — maintains electrical integrity in thermal overload above rated temperature
- Custom cross-sections and drum lengths — 500 m standard drum, non-standard from 200 m MOQ
Common Applications
Furnace heating element power supply
The main power feed from the furnace control panel to the heating element terminal blocks inside the furnace — carrying continuous currents from 100A to 300A at 200°C to 450°C ambient temperature at the cable routing point inside the furnace structure. This is a heavier-gauge, higher-current application than the element lead wire itself.
Induction furnace coil power connection
Water-cooled induction coils in induction melting furnaces require heavy power cable connections from the induction power supply to the coil terminals — a connection that must carry very high currents (often 1000A+) while withstanding the intense radiant heat from the molten metal charge and the electromagnetic fields generated by the induction coil.
Electric arc furnace electrode power leads
Short flexible power leads connecting the main bus bars to the graphite electrode arms in electric arc furnaces require heavy-gauge high-temperature cable capable of carrying thousands of amperes while withstanding the radiant heat from the arc and the elevated ambient temperature inside the furnace structure.
Other applications
- Resistance welding machine secondary power connections
- Industrial salt bath and molten metal heating systems
- High-current electrochemical process power feeds
- High-power infrared heating panel element connections
Ordering Information
Specify insulation type (silicone or mica tape), cross-section, core configuration (single or multi-core), and drum length. Custom cross-sections, nickel-plated conductor option for highest-temperature mica tape variants, and pre-terminated assemblies with compression lugs available from 200 m MOQ.
Third-party test reports available. Contact us for pricing within 24 hours.
Why Choose CableApex
CableApex manufactures heavy duty high temperature power cable under UL Follow-Up Service (File No. E333030) for Styles 3135, 5107, and 5128. Our large cross-section silicone extrusion lines and mica tape winding lines are equipped with 100% online spark testing and conductor resistance verification. We supply to furnace manufacturers, smelting equipment OEMs, induction heating system builders, and industrial machinery manufacturers across more than 40 countries.
