KGRET, KGRETOpSh and KGpE-10 3.3 to 10kV Arctic Mining Cable

Open-pit coal, gold, diamond, copper and iron-ore mines operating across Siberia, Yakutia, Norilsk, northern Kazakhstan and Mongolia experience winter ambient temperatures reaching -55 C to -60 C, where conventional polychloroprene and standard natural/butadiene excavator cables vitrify and fracture under trailing bend cycles. KGRET (КГРЭТ), KGRETOpSh (КГРЭТОпШ) and KGpE-10 (КГпЭ-10) medium-voltage mining cables are specifically formulated to maintain elastomeric flexibility during dynamic shovel dragging and drum reeling at -60 C.

Each designation addresses a specific mechanical and voltage requirement on EKG (ЭКГ) and ESh (ЭШ) electric excavators, walking draglines and high-voltage pit distribution mobile substations. KGRET 6 kV incorporates a heat-resistant fluorosiloxane or specialized cold-resistant rubber dielectric with a thermal-protective barrier over Class 5 copper conductors, allowing higher continuous conductor temperatures (+85 C to +90 C) alongside -60 C arctic flexibility. KGRETOpSh adds a high-tenacity polyamide/aramid reinforcing braid (Op) between the inner and outer cold-resistant sheaths (Sh) to absorb extreme rock-bench pulling tension.

For newer 10 kV open-pit power networks feeding high-capacity electric rope shovels and mobile pit crushers, KGpE-10 (КГпЭ-10) provides a 10 kV triple-extruded ethylene-propylene elastomer (EPR) dielectric with semi-conducting elastomeric screens and an arctic-grade outer jacket. TEBAOFLEX manufactures custom KGRET, KGRETOpSh and KGpE-10 lengths from a 50 m MOQ with a 7 to 45 working day lead time.

Explore the mining and tunneling cable range for related configurations.

KGRET, KGRETOpSh and KGpE-10 Construction

The representative horizontal sample illustrates the KGRETOpSh 6 kV 3x50 + 1x16 arctic excavator trailing cable, showing three flexible Class 5 copper phase conductors with semi-conducting conductor screens, thermal-protective cold-resistant rubber/EPR insulation and semi-conducting core screens, one grounding/earth core, inner elastomeric bedding, open-weave synthetic reinforcing braid (Op) and cold-resistant arctic black outer sheath (Sh).

KGRET, KGRETOpSh and KGpE-10 Code and Designation Breakdown

• KG (КГ): Kabel Gibkii — flexible multi-wire Class 5 copper conductor mining cable for mobile excavating machinery
• R (Р): Cold-resistant siloxane-modified rubber insulation engineered to retain elastomeric flexibility down to -60 °C
• E (Э): Ekranirovannyi — extruded semi-conducting elastomeric conductor and core screens for radial field control and earth-leakage tripping
• T (Т): Teplostoikii — thermal-protective barrier layer over the conductor raising continuous operating temperature to +85 °C / +90 °C
• OpSh (ОпШ): Opletka + Shlang — high-tenacity synthetic anti-torsion reinforcing braid (Op) embedded between inner and outer arctic elastomer sheaths (Sh)
• KGpE-10 (КГпЭ-10): 10 kV nominal three-phase AC screened ethylene-propylene rubber (p = EPR) open-pit excavator and mobile substation trailing cable

KGRET, KGRETOpSh and KGpE-10 Applications

Specify KGRET, KGRETOpSh and KGpE-10 cables for extreme cold-climate open-pit mining machines and mobile 3.3 kV, 6 kV and 10 kV quarry distribution.

• EKG-5A, EKG-8I, EKG-10, EKG-12, EKG-15 and EKG-18 open-pit electric rope shovels and ESh walking draglines operating in -60 C winter conditions.
• Rotary blast-hole drilling rigs (SBSh-250MNA-32) and hydraulic mining excavators subjected to sharp basalt, iron-ore and overburden rock abrasion.
• 10 kV open-pit mobile transformer substations (PKTP), in-pit crushing stations and high-voltage excavator trailing feeders using KGpE-10.
• Upgrade replacement for standard KGE and KGESh cables (rated to -40 C) in Arctic, Siberian, Kazakh and Mongolian mines requiring -60 C cold-bend reliability and +90 C conductor rating.

KGRET, KGRETOpSh and KGpE-10 Model Comparison and Selection Boundary

Specify KGRETOpSh (3.3/6 kV) or KGpE-10 (10 kV) with synthetic reinforcing braid (Op) whenever open-pit cables are dragged across blasted rock benches or wound on tension reels below -40 °C.

Related selection resources

• Mining and tunneling cable engineering solutions
• Abrasion-resistant and extreme-climate mobile mining cable engineering guide
• KGE, KGESh and KGETSh 1.14 to 6kV GOST Mining Cable
• UGF and UGEFP high-voltage open-pit mining trailing cable (3.6/6 to 6/10 kV)
• AS/NZS 2802 Type 440F and 450F Fibre-Optic Reeling Cable

KGRET, KGRETOpSh and KGpE-10 Frequently Asked Questions

How do KGRET, KGRETOpSh and KGpE-10 achieve -60 °C arctic flexibility without jacket cracking?

Instead of standard chloroprene or natural-butadiene rubber (which stiffens below -35 °C to -40 °C), KGRET and KGRETOpSh utilize siloxane-modified arctic elastomers and KGpE-10 uses cold-plasticized ethylene-propylene rubber (EPR) paired with an UHL1/HL1 arctic outer jacket that passes GOST cold-bend tests at -60 °C.

What is the engineering purpose of the thermal barrier (T) and braid (Op) in KGRETOpSh?

The thermal barrier layer (T) over the flexible copper conductor prevents copper-catalyzed thermal aging, permitting continuous conductor operation at +85 °C to +90 °C. The high-tenacity synthetic braid (Op) between the inner and outer sheaths raises permissible pulling tension from 15 N/mm² to 25 N/mm² on rocky excavator benches.

When should a mine specify KGpE-10 (КГпЭ-10) instead of KGRET or KGRETOpSh?

Specify KGpE-10 whenever the open-pit shovel, dragline or mobile transformer substation operates on a 10 kV three-phase AC network; KGRET and KGRETOpSh are rated for 3.3 kV and 6 kV networks.

What are the minimum order quantity and delivery time for KGRET, KGRETOpSh and KGpE-10?

TEBAOFLEX manufactures KGRET, KGRETOpSh and KGpE-10 from a 50 m minimum order quantity (MOQ) with a 7 to 45 working day lead time, accompanied by 15 kV AC (for 6 kV cables) or 25 kV AC (for 10 kV cables) factory test protocols.

KGRET, KGRETOpSh and KGpE-10 Technical Specifications

KGRET, KGRETOpSh and KGpE-10 Key Specifications

• Standards & Models: GOST 24334 / GOST 31945 KGRET (6 kV), KGRETOpSh (3.3–6 kV braid-reinforced) and KGpE-10 (10 kV EPR)
• Rated Voltage & Sizes: 3.3 kV, 6 kV and 10 kV AC; 3x16 mm² to 3x150 mm² Class 5 flexible copper phase cores + ground core
• Arctic Temperature Range: -60 °C minimum dynamic ambient flexing temperature to +85 °C / +90 °C continuous conductor temperature
• Screen & Tensile Protection: Extruded semi-conducting rubber phase screens, thermal barrier and synthetic anti-torsion braid (up to 25 N/mm²)
• Minimum Bend Radius & Supply: 5 x O.D. (3.3–6 kV) to 6 x O.D. (10 kV) bend radius; MOQ 50 m; lead time 7 to 45 working days

GOST KGRET 6 kV Arctic Cold-Resistant (-60 °C) Excavator Cable Size Schedule

GOST KGRETOpSh (3.3–6 kV) and KGpE-10 (10 kV) Braid-Reinforced Arctic Cable Size Schedule

Factory AC high-voltage routine test: 15 kV AC for 5 minutes on 6 kV KGRET/KGRETOpSh power cores and 25 kV AC for 5 minutes on 10 kV KGpE-10 power cores.

Specify if an auxiliary insulated control/monitoring core (+1x4 mm2 or +1x6 mm2) is required alongside the grounding conductor for pit-substation earth-continuity relays.

ASCII part references for BOM and ERP entry: KGRET 3x16+1x10 (6 kV), KGRET 3x25+1x10 (6 kV), KGRET 3x35+1x16 (6 kV), KGRET 3x50+1x16 (6 kV), KGRET 3x70+1x25 (6 kV), KGRET 3x95+1x35 (6 kV), KGRET 3x120+1x35 (6 kV), KGRET 3x150+1x50 (6 kV), KGRETOpSh 3x25+1x16 (3.3/6 kV), KGRETOpSh 3x35+1x16 (3.3/6 kV), KGRETOpSh 3x50+1x16 (3.3/6 kV), KGRETOpSh 3x70+1x25 (3.3/6 kV), KGRETOpSh 3x95+1x35 (3.3/6 kV), KGpE-10 3x25+1x16 (10 kV), KGpE-10 3x35+1x16 (10 kV), KGpE-10 3x50+1x16 (10 kV), KGpE-10 3x70+1x25 (10 kV), KGpE-10 3x95+1x35 (10 kV).

KGRET, KGRETOpSh and KGpE-10 Standards and Test References

Certifications and document support

TEBAOFLEX company certificates and quality system documentation

IEC Webstore — IEC 60228 Conductors and IEC 60332-1-2 Flame Test Standards