Special Cable

Special cables are used across virtually every industry where standard cables cannot meet the demands of the environment or application. Key industries include:

• Oil and Gas – Onshore and Offshore Platforms, Refineries, Pipelines and Subsea Operations
• Marine and Offshore Engineering – Ships, Offshore Platforms, Subsea Equipment and Desalination Plants
• Mining – Underground mining, draglines, and heavy extraction equipment
• Renewable Energy – Wind power, solar, and hydroelectric generation
• Railways and Transportation – Urban Rail Transit, Subways and Tunnels
• Aerospace – Aircraft wiring, ground support equipment
• Automotive & Manufacturing – Assembly lines, robotics, and automation systems
• Construction & Heavy Machinery – Cranes, aerial lifts, and building equipment
• Nuclear Power – High-radiation environments requiring specialized insulation

Special cables ensure power and signal integrity in applications where performance, safety, and reliability are non-negotiable.

CP cable (Cathodic Protection Cable) is used as a DC feeder cable in cathodic protection systems to prevent corrosion of metallic structures that are buried or submerged.

Specifically, CP cable connects the power source (rectifier) to the anodes in an impressed current cathodic protection system, delivering the protective current that makes the metal structure the cathode of an electrochemical cell—effectively stopping corrosion.

Common applications include:

• Underground pipelines (oil, gas, water, fuel)
• Storage tanks (petroleum, chemical, water)
• Steel pier piles and dock structures
• Offshore oil platforms and well casings
• Ships and marine vessels
• Lock gates, dams, and other submerged steel structures

CP cables are typically insulated with HMWPE (high molecular weight polyethylene) or fluoropolymers for excellent chemical resistance, low water absorption, and long-term durability in harsh soil or underwater environments.

Yes, you typically do. Variable Frequency Drives (VFDs) create electrical conditions that regular power cables are not designed to handle.

The frequency converter uses pulse width modulation (PWM) to control the motor speed, thereby producing the following effects:

• Rapid voltage transitions and high-frequency switching
• Harmonic noise and electromagnetic interference (EMI)
• Reflected wave voltages that can stress cable insulation

A proper VFD cable is a special cable engineered to address these issues with:

• Effective grounding (often with a symmetrical ground design) to keep currents within the cable
• Proper shielding to contain EMI and prevent interference with other equipment
• High strand count conductors for flexibility, cooler operation, and vibration resistance
• XLPE insulation to withstand the electrical stress of high-frequency switching

Using a standard power cable on a VFD can lead to premature insulation failure, radiated interference affecting nearby sensitive equipment, bearing damage in the motor, and nuisance tripping. Most VFD manufacturers recommend screened/specialized VFD cable, and in some countries, it’s a regulatory requirement.

In hazardous locations (such as Class I, Division 1 or Zone 0/1 environments where flammable gases, vapors, or dust are present), cables must prevent explosions by ensuring that arcs, sparks, or heat cannot escape the cable system or travel through it. The industry standard special cables include:

• Type MC-HL (Metal-Clad for Hazardous Locations): Features a continuous, gas-tight, corrugated aluminum or steel armor over the insulated conductors, covered by a sunlight- and chemical-resistant PVC outer jacket. It prevents gases from migrating through the interior of the cable.
• Type ITC-HL (Instrumentation Tray Cable for Hazardous Locations): Similar to MC-HL but optimized for lower-power instrumentation and signaling loops in explosive areas.
• TC-ER-HL (Tray Cable – Exposed Run – Hazardous Location): Specialized flame-retardant, crushed-resistant cables permitted in specific hazardous zones when installed with proper vapor-tight gland fittings.
• Key Construction Features: These cables must possess gas-tight extruded beddings, highly packed fillers to prevent the transmission of explosive vapors through the cable core, and rigorous flame-retardant ratings (such as passing the IEEE 1202 flame test).

Yes, absolutely. In fact, customization is the defining characteristic of the specialty cable industry. Because standard, off-the-shelf wires cannot account for every unique industrial hazard, custom engineering is often the only way to ensure long-term operational reliability.

When partnering with an experienced manufacturer, special cables can be tailored across three critical dimensions:

• Material Formulation: Inner insulation and outer jackets can be customized using advanced polymers like PVDF, Halar, HMWPE, or Polyurethane (PUR) to match specific environmental threats—such as severe chemical corrosion, chlorine gas exposure in cathodic protection systems, or extreme temperatures.
• Mechanical Structure: Cables can be structurally reinforced with high-flex copper stranding, heavy-duty armor, or internal aramid strength members to endure continuous bending (like in drag chains) or high-tensile pulling.
• Hybrid Integration: Multiple functions can be merged into a single composite architecture, combining power cores, shielded data lines, signals, or fiber optics under one sleeve to maximize space efficiency.

Ultimately, customizing special cables allows project managers and engineers to build a target-rated asset that fits the exact environmental and spatial constraints of their application, preventing expensive downtime.