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symmetrical earth conductor

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.
15 Min Read
(N)TSCGEWÖU 3x185+3x35/3 6/10kV cables in large-scale mining operations, the outer diameter is not merely a specification number—it is a critical interface parameter determining whether the cable fits your reel system, passes through underground shaft collars, mates with terminal connectors, and allows proper tension management during deployment and retrieval.
Technical Department
on27/02/2026

What is the Exact Outer Diameter of (N)TSCGEWÖU 3×185+3×35/3 6/10kV Reeling Cable?

(N)TSCGEWÖU 3×185+3×35/3 6/10kV cables in large-scale mining operations, the outer diameter is not merely a specification number—it is a critical interface parameter determining whether the cable fits your reel system, passes through underground shaft collars, mates with terminal connectors, and allows proper tension management during deployment and retrieval.
6 Min Read
The RHEYFIRM® family represents Nexans' flagship line of flexible medium-voltage reeling cables, engineered specifically for extreme mechanical stress applications including Ship-to-Shore (STS) cranes, Rail Mounted Gantry (RMG) cranes, stacker reclaimers, and heavy mobile mining equipment. The "(S)" designation indicates the symmetrical configuration featuring the distinctive 3+3 core design, where three phase conductors are complemented by three protective earth conductors strategically positioned in the cable interstices. RHEYFIRM®系列是Nexans旗下的中压柔性卷筒电缆产品线，专为极端机械应力应用设计，包括岸桥(STS)起重机、轨道式龙门起重机(RMG)、堆取料机及重型移动采矿设备。"(S)"标识表示对称配置，采用独特的3+3芯设计，三根相线导体与三根保护接地导体战略性地布置在电缆间隙中。
Technical Department
on09/02/2026

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

The RHEYFIRM® family represents Nexans’ flagship line of flexible medium-voltage reeling cables, engineered specifically for extreme mechanical stress applications including Ship-to-Shore (STS) cranes, Rail Mounted Gantry (RMG) cranes, stacker reclaimers, and heavy mobile mining equipment. The “(S)” designation indicates the symmetrical configuration featuring the distinctive 3+3 core design, where three phase conductors are complemented by three protective earth conductors strategically positioned in the cable interstices. RHEYFIRM®系列是Nexans旗下的中压柔性卷筒电缆产品线，专为极端机械应力应用设计，包括岸桥(STS)起重机、轨道式龙门起重机(RMG)、堆取料机及重型移动采矿设备。”(S)”标识表示对称配置，采用独特的3+3芯设计，三根相线导体与三根保护接地导体战略性地布置在电缆间隙中。