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UV resistant marine cable

23 Min Read
The ampacity of NEK 606 RFOU 0.6/1kV 4G120 mm² cable in free air at the NEK 606 standard reference condition (45°C ambient, 90°C conductor temperature) is approximately 260 amperes for a single cable installed on an open support structure with unrestricted air circulation. When this same cable is installed in a two-tier (double-banked) configuration where one 4G120 cable sits directly above another with minimal vertical spacing (typical spacing 50–100 mm between outer sheaths), the ampacity of each cable must be derated to approximately 200–215 amperes, representing a derating factor of about 0.78–0.82 or roughly an 18–22% reduction from the free-air rating. When three cables are stacked vertically (three-tier configuration), the derating becomes more severe: the bottom cable sees approximately 0.68–0.72 factor (177–187 A), the middle cable experiences approximately 0.70–0.74 factor (182–192 A), and the top cable maintains approximately 0.80–0.85 factor (208–221 A). The fundamental reason for these derating reductions is that vertically stacked cables cannot dissipate heat as effectively as cables in free air because the upper cables partially shield the lower cables from direct air circulation, creating a thermally interactive system where the waste heat from upper cables warms the ambient environment around lower cables, reducing their cooling effectiveness and thereby their safe operating current capacity.
Technical Department
on27/02/2026

Double-Banked Cable Trays: What is the ampacity derating factor for NEK 606 RFOU 0.6/1kV 4G120 mm² cables installed in vertically stacked (double-banked) offshore platform configurations?

The ampacity of NEK 606 RFOU 0.6/1kV 4G120 mm² cable in free air at the NEK 606 standard reference condition (45°C ambient, 90°C conductor temperature) is approximately 260 amperes for a single cable installed on an open support structure with unrestricted air circulation. When this same cable is installed in a two-tier (double-banked) configuration where one 4G120 cable sits directly above another with minimal vertical spacing (typical spacing 50–100 mm between outer sheaths), the ampacity of each cable must be derated to approximately 200–215 amperes, representing a derating factor of about 0.78–0.82 or roughly an 18–22% reduction from the free-air rating. When three cables are stacked vertically (three-tier configuration), the derating becomes more severe: the bottom cable sees approximately 0.68–0.72 factor (177–187 A), the middle cable experiences approximately 0.70–0.74 factor (182–192 A), and the top cable maintains approximately 0.80–0.85 factor (208–221 A). The fundamental reason for these derating reductions is that vertically stacked cables cannot dissipate heat as effectively as cables in free air because the upper cables partially shield the lower cables from direct air circulation, creating a thermally interactive system where the waste heat from upper cables warms the ambient environment around lower cables, reducing their cooling effectiveness and thereby their safe operating current capacity.
22 Min Read
Walk into the procurement office of any major container port or container handling facility, and you will almost certainly encounter discussions about reeling cables for cranes. The conversation often centers around one particular product family: Draka's Buflex XTREME series. Since its introduction in the early 2000s, Buflex XTREME has become the de facto standard for high-speed, space-constrained applications across port machinery—rubber tyred gantry cranes (RTG), ship-to-shore cranes (STS), and mobile harbor equipment. The cable family has earned this reputation through genuine technical excellence: an exceptionally compact outer diameter, remarkable flexibility, and proven durability under continuous flexing stress. Yet despite—or perhaps because of—this market dominance, Buflex XTREME presents a formidable procurement challenge for port operators, especially those managing budgets across multiple facilities in different regions.
Technical Department
on26/02/2026

Draka Buflex XTREME Replacement Guide: High-Performance Reeling Cables for Port Cranes with Superior Cost-Effectiveness and Fast Delivery

Walk into the procurement office of any major container port or container handling facility, and you will almost certainly encounter discussions about reeling cables for cranes. The conversation often centers around one particular product family: Draka’s Buflex XTREME series. Since its introduction in the early 2000s, Buflex XTREME has become the de facto standard for high-speed, space-constrained applications across port machinery—rubber tyred gantry cranes (RTG), ship-to-shore cranes (STS), and mobile harbor equipment. The cable family has earned this reputation through genuine technical excellence: an exceptionally compact outer diameter, remarkable flexibility, and proven durability under continuous flexing stress. Yet despite—or perhaps because of—this market dominance, Buflex XTREME presents a formidable procurement challenge for port operators, especially those managing budgets across multiple facilities in different regions.