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Nexans RHEYFIRM

20 Min Read
RHEYFIRM® (S) series reeling cables with 3+3 core distributed earth design exhibit outer diameters ranging from approximately 40.0 mm (for 3×25+3×25/34 mm² configurations at 6/10 kV) to 76.0 mm or larger (for heavy-duty 3×185+3×95/35 mm² configurations at 12/20 kV). The nominal outer diameter depends on the specific conductor cross-section, voltage rating, and insulation thickness selected. For a typical medium-voltage marine and industrial application, a RHEYFIRM® (S) cable rated 3×70+3×35/32 mm² at 6/10 kV exhibits an outer diameter between 52.0 mm and 56.0 mm with approximate total cable weight of 4,300 kg/km (2,890 lbs/1000ft), while the corresponding 12/20 kV variant reaches 62.0 to 67.0 mm outer diameter with weights near 6,800 kg/km (4,570 lbs/1000ft).
Technical Department
on03/03/2026

RHEYFIRM® (S) 3+3 Core Design: Why Does Nexans Use Distributed Earth in the (S) Series and How Does It Affect EMC?

RHEYFIRM® (S) series reeling cables with 3+3 core distributed earth design exhibit outer diameters ranging from approximately 40.0 mm (for 3×25+3×25/34 mm² configurations at 6/10 kV) to 76.0 mm or larger (for heavy-duty 3×185+3×95/35 mm² configurations at 12/20 kV). The nominal outer diameter depends on the specific conductor cross-section, voltage rating, and insulation thickness selected. For a typical medium-voltage marine and industrial application, a RHEYFIRM® (S) cable rated 3×70+3×35/32 mm² at 6/10 kV exhibits an outer diameter between 52.0 mm and 56.0 mm with approximate total cable weight of 4,300 kg/km (2,890 lbs/1000ft), while the corresponding 12/20 kV variant reaches 62.0 to 67.0 mm outer diameter with weights near 6,800 kg/km (4,570 lbs/1000ft).
18 Min Read
The continuous current carrying capacity of an (N)TSCGEWÖU 3x50+3x25/3 12/20kV cable wound in three compacted layers on a standard industrial reel is approximately 85 to 110 amperes depending on ambient temperature, mechanical stress conditions, and reel cooling characteristics. This represents a significant reduction from the cable's reference rating of 202 amperes, which is established under ideal laboratory conditions (30°C ambient, single conductor run in free air, no mechanical tension or twisting). The dramatic derating from 202 A to 85–110 A reflects the thermal constraint imposed by the compact three-layer geometry, where the inner layers of wound cable are thermally insulated by outer layers, preventing efficient dissipation of I²R resistive losses to the surrounding environment. The cable features three 50 mm² Class 2 stranded tinned copper main power conductors and a symmetrical 3×25 mm² grounding conductor architecture (the "3+3" design), weighing approximately 1,850 kg/km of copper content and 3,550–3,650 kg/km total weight, with proven torsional twist resistance to ±100°/m and maximum tensile load capability of 3,000 newtons per phase conductor.
Technical Department
on27/02/2026

Derating Factors: Current carrying capacity of (N)TSCGEWÖU 3×50+3×25/3 12/20kV wound in 3 layers on a reel

The continuous current carrying capacity of an (N)TSCGEWÖU 3×50+3×25/3 12/20kV cable wound in three compacted layers on a standard industrial reel is approximately 85 to 110 amperes depending on ambient temperature, mechanical stress conditions, and reel cooling characteristics. This represents a significant reduction from the cable’s reference rating of 202 amperes, which is established under ideal laboratory conditions (30°C ambient, single conductor run in free air, no mechanical tension or twisting). The dramatic derating from 202 A to 85–110 A reflects the thermal constraint imposed by the compact three-layer geometry, where the inner layers of wound cable are thermally insulated by outer layers, preventing efficient dissipation of I²R resistive losses to the surrounding environment. The cable features three 50 mm² Class 2 stranded tinned copper main power conductors and a symmetrical 3×25 mm² grounding conductor architecture (the “3+3” design), weighing approximately 1,850 kg/km of copper content and 3,550–3,650 kg/km total weight, with proven torsional twist resistance to ±100°/m and maximum tensile load capability of 3,000 newtons per phase conductor.