Introduction: When 240 mm² Is Not Enough

Every other LV reeling cable in the Klaus Faber catalogue tops out at 3×240 mm² phase conductors. The CORDAFLEX (SMK) maxes at 3×240+3×120/3 (71.4 mm OD, 11,998 kg/km). The NSHTOEu /3 maxes at the same configuration (87.7 mm OD, 11,760 kg/km). The CORDAFLEX XPRT currently offers only 04×16. For the vast majority of crane and industrial applications, 240 mm² delivers adequate ampacity (typically 453–540 A at 30°C ambient).

But for the largest STS cranes, mega stacker-reclaimers, bucket wheel excavators, and high-power mining systems — applications where motor drives demand 500+ A continuous at the cable reel — 240 mm² is not enough. The BiTcrane® (N)SHTOEU fills this gap with 03×300+3×150/3 — a 300 mm² phase conductor configuration that delivers 621 A continuous ampacity through a single reeling cable. This is not an incremental upgrade; it is a 25% ampacity increase over the largest CORDAFLEX (SMK) configuration, achieved through a purpose-built design from Bitner Cable Factory (Poland) that combines HEPR insulation, bare copper Class 5 conductors, and a dual-5GM5 rubber sheath system.

Full Technical Specification

The Configuration: 03×300+3×150/3

Every number in this table tells a story of a cable engineered at the absolute limits of LV reeling cable design. 621 A continuous ampacity — the highest of any single LV reeling cable, enough to power motor drives up to approximately 600 kW at 690 V or 430 kW at 400 V. 44.7 kA short-circuit withstand for 1 second — explicitly listed on the datasheet, a data point that no other cable in this guide series provides (the CORDAFLEX variants and NSHTOEu /3 do not publish Ik values). 0.0641 Ω/km resistance — the lowest of any LV reeling cable, confirming the use of bare (not tinned) copper for maximum conductivity. 10,080 kg/km copper content — over 10 tonnes of copper per kilometre, representing a cable where copper alone accounts for 77% of the total weight.

Fzd/Fzp = 2.0×: The Most Extreme Dynamic Tensile Ratio

The BiTcrane’s dual tensile rating reveals an extraordinary engineering characteristic: Fzp = 13,500 N (permanent) and Fzd = 27,000 N (dynamic) — a ratio of exactly 2.0×. This means the cable can handle dynamic peak tensile loads at double its permanent continuous rating. For comparison, the NSHTOEu /3 has a consistent Fzd/Fzp ratio of 1.33× across all configurations. The BiTcrane’s 2.0× ratio is unique in the entire Klaus Faber reeling cable catalogue.

This 2.0× ratio has profound implications for cable specification on large-scale reeling systems. In stacker-reclaimer and bucket wheel excavator operations, the cable experiences extreme transient dynamic loads — sudden starts and stops of the travel drive, wind gusts on exposed cable spans, emergency brake activations, and shock loads from terrain irregularities. These transient loads can momentarily double or triple the steady-state tensile force. The BiTcrane’s 27,000 N dynamic rating provides a 100% safety margin above the permanent 13,500 N — meaning the cable can absorb a momentary tensile spike at double the sustained operating load without conductor damage or sheath delamination.

Fzp Verification: Total copper cross-section = 3 × 300 + 150 = 1,050 mm². At 30 N/mm²: 30 × 1,050 = 31,500 N. The published Fzp of 13,500 N represents the safe working limit of the complete cable assembly — approximately 43% of the theoretical conductor limit. The Fzd of 27,000 N utilises approximately 86% of the theoretical conductor limit, approaching the copper’s mechanical ceiling under short-duration dynamic loads.

HEPR Insulation: Hard Grade Ethylene Propylene Rubber

The BiTcrane uses HEPR (Hard Ethylene Propylene Rubber) insulation — a harder, denser variant of standard EPR with improved load-bearing capacity and dielectric properties. While the CORDAFLEX XPRT specifies EPR 3GI3 and the CORDAFLEX (SMK) uses an unspecified insulation, the BiTcrane’s HEPR designation indicates a formulation with higher mineral filler content (typically clay-based) that increases mechanical hardness and dimensional stability under the extreme compressive forces present in a 300 mm² conductor cable.

At the 300 mm² conductor cross-section, the insulation must withstand enormous radial compressive forces during drum winding — the weight of upper cable layers on a fully wound drum compresses the insulation of the bottom layers. Standard EPR’s inherent softness can lead to insulation deformation, reduced wall thickness, and eventual dielectric breakdown under these conditions. HEPR’s increased hardness resists this compression, maintaining consistent wall thickness and dielectric integrity even under the sustained pressure of a multi-layer drum wind. This is the engineering reason why the BiTcrane specifies HEPR rather than the standard EPR used in smaller-conductor cables.

HEPR also provides superior dimensional stability at elevated temperatures. At the 621 A continuous current and 90°C conductor rating, the insulation surface temperature can approach 70–75°C during normal operation. Standard EPR softens significantly at these temperatures; HEPR maintains its mechanical properties, preventing insulation deformation during reeling under thermal load. The improved dielectric strength of HEPR (typically 15–20% higher than standard EPR at equivalent wall thickness) also contributes to the cable’s 3.5 kV test voltage rating.

Bare Copper Class 5: Maximum Conductivity for Maximum Current

The BiTcrane is the only cable compared in this guide series that uses bare (uncoated) copper conductors. The CORDAFLEX (SMK), CORDAFLEX XPRT, and NSHTOEu /3 all use tinned copper. The decision to use bare copper in the BiTcrane is an intentional engineering choice driven by the cable’s extreme current requirements.

Tin coating adds approximately 2.5–3% additional resistance to copper conductors. For 300 mm², this difference is small in percentage terms but significant in absolute terms: bare copper at 300 mm² = 0.0601 Ω/km (IEC 60228 maximum for Class 5) vs. tinned copper at approximately 0.0619 Ω/km. At 621 A continuous current, the resistance difference translates to approximately 0.7 W/m additional heat generation per phase — or 2.1 W/m total across three phases. Over a typical 400-metre cable run on a stacker-reclaimer, this equates to 840 W of additional continuous heat generation that must be dissipated. By using bare copper, the BiTcrane eliminates this thermal penalty, maintaining the tightest possible thermal margin at the cable’s rated ampacity.

The datasheet resistance of 0.0641 Ω/km is slightly above the IEC 60228 Class 5 bare copper maximum of 0.0601 Ω/km for 300 mm², reflecting the specific conductor construction optimisation for this cable’s mechanical requirements (strand compaction, lay length, and strand diameter are tuned for 30 N/mm² tensile performance, which slightly increases resistance above the theoretical minimum).

Bending Radius: 4-Mode Table with S-Curve Specification

The BiTcrane’s bending radius table includes a unique specification not found on any other cable: the S-shaped track curve minimum of ≥20×D. S-shaped track curves occur where the cable path reverses direction in an S-pattern — typically at the transition between a horizontal cable run and a vertical drop on a stacker-reclaimer or ship loader. At this transition, the cable experiences simultaneous reverse bending in two planes — a compound stress state that is far more severe than simple single-plane bending.

The 20×D minimum translates to ≥1,480 mm (1.48 metres) radius for the 74 mm OD BiTcrane cable. Cable path designers and mechanical engineers must ensure that any S-shaped transition in the cable routing system maintains at least this radius to prevent accelerated cable fatigue. This specification is critical for stacker-reclaimer and bucket wheel excavator designs where the cable path often includes multiple S-transitions along the boom and counterweight cable routing.

BiTcrane vs. CORDAFLEX (SMK) at Maximum Configuration

Application: The Largest Machines in Port and Mining

The BiTcrane® (N)SHTOEU is engineered for the absolute highest-power motorised drum reeling applications — machines where a single cable run must deliver 400+ kW of three-phase power through a continuously reeling cable. Typical applications include the largest STS (Ship-to-Shore) container cranes with high-power hoist and trolley drives, stacker-reclaimers in bulk material terminals (coal, iron ore, bauxite), bucket wheel excavators in open-pit mining, large ship loaders and unloaders in bulk ports, and heavy industrial overhead travelling cranes in steel mills and heavy fabrication facilities.

The cable’s dual-5GM5 rubber sheath system provides the abrasion, tear, oil, and UV resistance needed for multi-year outdoor service in the harshest environments — from desert mining sites to Arctic port terminals. The yellow colour coding follows international convention for reeling cables, ensuring immediate visual identification. The −30°C moving temperature rating enables year-round operation in cold-climate installations, while the 240 m/min operating speed supports modern high-speed crane travel drives.

Cost-Effective Alternative from Feichun

Feichun Lead Times: 03×300+3×150/3 configuration: 10–14 weeks (engineered-to-order). European OEM: 24–36 weeks for this specialised cross-section.

Technical FAQ

Who manufactures the BiTcrane®? BiTcrane® is a registered trademark of Bitner Cable Factory (Kabelwerk Bitner), a Polish cable manufacturer specialising in heavy-duty reeling and industrial cables. The cable is distributed through Klaus Faber AG’s global network. Bitner manufactures reeling cables under the BiTcrane brand to DIN VDE 0250-814 standards, with product lines spanning low voltage (NSHTOEU) through medium voltage (NTSCGEWOEU) reeling cables. Feichun’s equivalent is manufactured in China to the same VDE 0250-814 specification with equivalent or superior materials.

Why does the BiTcrane use “synthetic braid” instead of “polyester braid”? The datasheet specifies “synthetic braid” rather than the “polyester braid” used by CORDAFLEX and NSHTOEu cables. This broader designation may indicate a higher-strength synthetic material (such as aramid-polyester blend or high-tenacity polyamide) selected to handle the extreme torsional forces present in a 13,136 kg/km cable. At 74 mm OD, the torsion braid must resist significantly higher angular momentum during reeling than in a typical 30–45 mm OD cable. The synthetic braid is vulcanised between the inner and outer 5GM5 sheath layers for maximum bond strength.

Why is the Fzd/Fzp ratio 2.0× instead of the 1.33× seen on the NSHTOEu /3? The 2.0× ratio reflects the BiTcrane’s target application — large-scale mining and heavy industrial reeling where extreme dynamic transients are routine. Bucket wheel excavators, for example, experience sudden terrain-induced cable jerks that can momentarily double the steady-state tensile. The 2.0× ratio provides sufficient margin for these transients without requiring oversized cable (which would increase drum size, motor torque, and cost). The NSHTOEu /3’s 1.33× ratio is adequate for the more controlled reeling environments typical of indoor crane and lifting applications.

Can Feichun supply BiTcrane-equivalent cables in other configurations beyond 03×300? Yes. Feichun can manufacture HEPR-insulated, bare copper Class 5, dual-5GM5 sheath cables in any three-phase power configuration from 3×50 to 3×300 and beyond — including custom configurations up to 3×400 mm² for ultra-high-power applications. All custom configurations are designed and verified per VDE 0250-814, with Fzp, Fzd, and Ik values calculated and tested for each specific cross-section. Contact our engineering team with your application requirements.

How does the 74 mm OD compare to cable reel capacity? At 74 mm OD and 13,136 kg/km, the BiTcrane requires significantly larger drum assemblies than standard reeling cables. A typical 400-metre cable run weighs approximately 5,254 kg on the drum. The drum motor must provide sufficient torque to accelerate this mass to 240 m/min, and the drum structure must support the weight plus dynamic tensile forces. Cable reel engineers should account for the 6×D reeling operation bending radius (444 mm minimum) when specifying drum barrel diameter.