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3/C 4/0 AWG Cable

18 Min Read
Type MMV 15kV 3/C 4/0 AWG marine medium voltage cable has a base continuous ampacity of 270 amperes when the conductor temperature reaches 90°C under standard ambient conditions of 45°C (113°F) in free air. This rating follows IEEE 45-2002 and IEEE 1580 marine standards and represents the maximum sustained current the cable can safely carry without exceeding the EPR insulation thermal limit. The cable features three 4/0 AWG (107.2 mm²) main power conductors of Class 5 highly flexible tinned copper stranding, supplemented by symmetrical grounding and shielding geometry optimized for maritime power distribution in offshore drilling units (MODUs), floating production storage offloading (FPSO) vessels, and port machinery applications. Approximate copper weight is 3,345 kg/km, and total cable weight is approximately 5,950 kg/km (unarmored) or 6,400 kg/km (bronze-braided armored variant).
Technical Department
on28/02/2026

Ampacity Chart: How Much Current Can Type MMV 15kV 3/C 4/0 AWG Marine Cable Carry at 90°C?

Understanding ampacity for marine cables differs fundamentally from standard industrial land-based cables because marine environments present unique thermal challenges. Shipboard cable routing often passes through engine rooms, boiler compartments, and tropical climates where ambient air temperatures routinely exceed the standard reference condition of 45°C. Additionally, marine cables must account for the physical constraints of vessel design—cables are bundled in trays, enclosed in cable trunking, and subjected to continuous vibration from engine operation and heavy sea state conditions. These factors necessitate precise ampacity derating calculations to ensure the cable operates safely throughout its design life without insulation degradation.
17 Min Read
The base continuous ampacity of a Nexans AmerCable Type MMV 15kV 3/C 4/0 AWG marine medium voltage cable at 90°C conductor temperature is 270 amperes when installed as a single conductor run in air at 45°C ambient temperature, per IEEE 45 marine cable standards. This rating assumes the cable is not bundled with other cables, is laid in a single-layer configuration on a properly ventilated cable tray or support structure, the surrounding air temperature does not exceed 45°C, and no thermal cycling or subsea temperature stratification effects are present. The approximate weight of this cable is 5,083 kg/km (3,418 lbs/1000 ft) for unarmored configurations and 5,750 kg/km (3,864 lbs/1000 ft) for bronze braid-armored versions. The cable features three 4/0 AWG (107.2 mm² equivalent) tinned copper Class 2 stranded conductors with flexible geometry, EPR 90°C thermosetting insulation rated for 100% or 133% voltage levels, symmetrical grounding conductors for balanced common-mode performance, and optional bronze braid armor providing mechanical protection.
Technical Department
on27/02/2026

Ampacity Chart: How much current can a Type MMV 15kV 3/C 4/0 AWG marine cable carry at 90°C? 

The base continuous ampacity of a Nexans AmerCable Type MMV 15kV 3/C 4/0 AWG marine medium voltage cable at 90°C conductor temperature is 270 amperes when installed as a single conductor run in air at 45°C ambient temperature, per IEEE 45 marine cable standards. This rating assumes the cable is not bundled with other cables, is laid in a single-layer configuration on a properly ventilated cable tray or support structure, the surrounding air temperature does not exceed 45°C, and no thermal cycling or subsea temperature stratification effects are present. The approximate weight of this cable is 5,083 kg/km (3,418 lbs/1000 ft) for unarmored configurations and 5,750 kg/km (3,864 lbs/1000 ft) for bronze braid-armored versions. The cable features three 4/0 AWG (107.2 mm² equivalent) tinned copper Class 2 stranded conductors with flexible geometry, EPR 90°C thermosetting insulation rated for 100% or 133% voltage levels, symmetrical grounding conductors for balanced common-mode performance, and optional bronze braid armor providing mechanical protection.