ROV Cable 2 Power Core Neutrally Buoyant Tether Custom Flexible Subsea Cables — heavy-duty ROV power tether with multi-core copper conductors rated to 600V–1,000V. Positive, neutral or zero buoyancy in seawater. Foam PUR jacket, Kevlar strength member. Delivers propulsion and payload power to work-class and observation ROVs.
This ROV Cable 2 Power Core Neutrally Buoyant Tether Custom Flexible Subsea Cables is a dedicated power tether cable designed to deliver propulsion and payload power from the surface topside unit to remotely operated vehicles at working depth. Unlike combined hybrid tethers, a power-dedicated tether maximises conductor cross-section area within a given outer diameter — delivering higher current capacity for power-intensive ROV operations such as high-power thrusters, hydraulic power units, high-intensity lighting systems, and electric manipulator arms.
Available in positive-buoyancy (floating), neutral-buoyancy (zero net force), and negative-buoyancy (sinking) configurations, this power cable is matched to each ROV deployment scenario — from open-water inspection dives to confined-space structural inspections where tether management is critical.
| Parameter | Specification |
|---|---|
| Voltage Rating | 600V AC/DC standard; 1,000V option |
| Conductor AWG | 10 AWG to 2 AWG (tinned stranded copper) |
| Core Count | 2 to 10 power cores |
| Current Capacity | 30A (10 AWG) to 130A (2 AWG) per core at rated jacket temperature |
| Insulation | XLPE 600V or 1,000V; -25°C to +90°C |
| Jacket | Foam PUR (buoyancy layer) + dense PUR outer abrasion jacket |
| Buoyancy Options | Positive (+buoyancy); Neutral (0 ±0.1 kg/m); Negative (-buoyancy) |
| Break Strength | 500 kg to 5,000 kg (Kevlar / steel wire on request) |
| Temperature | -25°C to +90°C continuous; foam PUR to 110°C short-term |
| Depth Rating | 300 m (light power); 1,000 m (heavy power with full waterblock) |
| OD Range | 14 mm (2×10 AWG) to 45 mm (10-core heavy umbilical) |
| Jacket Colour | Yellow, orange, black (UV-stabilised) |
In a hybrid tether sharing OD budget between power cores, data pairs, and fibre elements, each power conductor must be smaller than in an equivalent-OD dedicated power cable. A dedicated power tether concentrates all cross-section area in copper — delivering 40–60% more current per unit OD than a comparable hybrid. For power-limited ROVs, this directly extends thruster performance and vehicle capability.
High-current ROV thrusters generate significant harmonic disturbances on the power cable — conducted noise that couples into adjacent data pairs in hybrid tethers. Using separate power and data tethers eliminates this coupling entirely. The power tether can be screened independently for EMC compliance without the complexity of managing multiple cable elements within one jacket.
ROV buoyancy systems are trimmed to achieve slight positive buoyancy at operating depth for safety (vehicle rises when power is lost). By selecting positive-buoyancy power tether, the cable contributes a small upward force that supplements the vehicle's own buoyancy trim — reducing the amount of syntactic foam or ballast required on the vehicle frame, saving weight and cost.
Polyethylene (PE) foam jackets used on some ROV cables absorb seawater through open-cell foam structures, gradually increasing cable weight until buoyancy is lost. Our closed-cell foam PUR formulation does not absorb water under sustained hydrostatic pressure — buoyancy remains constant throughout the cable's working life without the gradual weighting that renders PE foam cables useless within 2–3 years of continuous offshore use.
| Model | Cores | AWG | Voltage | Buoyancy | OD (mm) | BS (kg) |
|---|---|---|---|---|---|---|
| Mini power (2C) | 2 | 14 | 600V | Positive | 18 | 500 |
| Standard power (2C) | 2 | 10–8 | 600V | Positive/Neutral | 22–26 | 800–1,500 |
| 3-phase power (3C) | 3 | 10–6 | 600V | Neutral | 24–32 | 1,000–2,000 |
| Multi-core (4–10C) | 4–10 | 14–10 | 600V/1kV | Neutral | 28–45 | 1,500–5,000 |
| Zero buoyancy (10C) | 10 | 14 | 600V | Neutral ±0.05 | 35 | 2,000 |
| Positive floating (2C+screen) | 2+TC screen | 12 | 600V | Positive | 20 | 600 |
Published current ratings assume a single cable in free air at 25°C. ROV power tethers on drums are effectively bundled — apply a derating factor of 0.7 for cables on a full drum (multiple layers) and 0.85 for single-layer spooling. Failure to derate causes conductor overheating that melts the PUR jacket from the inside — a failure mode invisible externally until jacket collapse occurs at a tight drum bend.
High-current connectors (topside and vehicle end) are the most common failure point on ROV power tethers. After each dive, inspect connector mating faces for corrosion, O-ring damage, and socket deformation. Rinse with fresh water, dry completely, and apply approved dielectric grease to O-ring seats before the next deployment. Replace any connector showing green verdigris on copper contacts — this indicates seawater ingress and incipient insulation failure.
Foam PUR jackets are more susceptible to permanent deformation at tight bends than dense solid jackets. Minimum dynamic bend radius is 12× OD for foam-jacketed power tethers (vs 10× for solid PUR). Drum barrel diameters should be at least 20× cable OD for foam tethers to prevent set during long-term storage in spooled condition.
Specify core count, conductor AWG, voltage, current demand, buoyancy (positive/neutral/negative), break strength, and operating depth — we engineer the exact power tether for your ROV system.
600V / 1,000V | Foam PUR buoyancy | Kevlar 500–5,000 kg | Custom lengths
