Polyurethane Reeling Cable | Heavy Duty Drum Cable | High Tensile & Abrasion Resistant for Crane Systems

Name: Polyurethane Reeling Cable | Heavy Duty Drum Cable | High Tensile & Abrasion Resistant for Crane Systems
Rating: 4.5 (10 reviews)

The RST-RC Series Polyurethane Reeling Cable is an engineering-led drum reel cable designed around the four mechanical forces — radial compression, torsional stress, guide roller abrasion, and tensile loading — that cause standard flexible and drag chain cables to fail prematurely on motorised drum reels. Available in power-only configurations from 3 × 2.5 mm² to 4 × 16 mm² (0.6/1 kV), combined power-plus-control formats, and medium-voltage models to 3.6/6 kV, with optional integrated Kevlar tensile members rated 2 kN to 6 kN for vertical hang and deep-mine applications. The polyether TPU outer jacket is formulated at Shore A 88 for compressive set recovery ≥85% under multi-layer winding pressure, with Taber abrasion ratings of ≥300 cycles (standard) or ≥500 cycles (HD Port grade for port crane and mining duty). All RST-RC drums are 100% HiPot tested per IEC 60502-1 and supplied with conductor resistance certificates; Kevlar models ship with a load-test certificate at 1.5× rated load. Project references include STS gantry cranes, overhead EOT cranes, automated stacker crane systems, open-cut mining reels, and tower crane installations across five continents. IECEx/ATEX Zone 1 & 2 options available for mining and petrochemical duty; DNV/Bureau Veritas type approval for marine installations. ISO 9001:2015 certified; CE, RoHS 2, REACH compliant. Sizing support and worked voltage-drop calculations provided as standard with quotation.

Description

Polyurethane Reeling Cable | Heavy-Duty Drum Cable | High Tensile & Abrasion Resistant for Crane & Industrial Systems

Category: Reeling & Festoon Cables │ Series: RST-RC │ By: Shanghai Rousheng Wire & Cable Engineering Team

500 m

Max. single drum length

6 kN

Kevlar tensile rating

0.6–6 kV

Voltage range

−40°C

Cold-flex rated

24 hr

Quote turnaround

Polyurethane reeling cable fails at a different set of physical stresses than any other flexible cable category — and that distinction is the reason standard drag chain cables, trailing cables, or general flex cables consistently fail within months when wound on a motorised drum reel. On a reel, the cable is compressed radially by the winding layers above it, twisted axially every time the drum rotates, abraded against guide rollers and reel flanges on every traverse cycle, and pulled in tension by the dead weight of its own hanging length. No cable that is not designed specifically for these four combined forces will survive the service life it is supposed to.

The RST-RC series addresses each stress with deliberate engineering choices — a polyether TPU jacket formulated for compressive set recovery rather than raw tensile strength, a core geometry that stays circular under winding pressure, and optional aramid (Kevlar) strength members that remove tensile load from the copper conductors entirely. This page covers construction, selection criteria, verified real-world applications, and a worked sizing example to help you specify the right cable on the first attempt.

Page Contents

Model Range & Selection Table
How Reeling Duty Differs from Drag Chain & Flex Cable
Real-World Project References
Layer-by-Layer Construction
Material Comparison: PUR vs. Rubber vs. PCP
Technical Parameters (Electrical & Mechanical)
Five-Step Drum Sizing Guide + Worked Example
FAQ — Questions from Engineers & Buyers
Manufacturer Credentials
Request a Quote

RST-RC Model Range — Specifications & Selection Guide

Model	Cores × Cross-section	Approx. OD	Min Drum Core Ø	Voltage	Tensile Member	Jacket Grade	Primary Industry
RST-RC-3C-2.5	3 × 2.5 mm²	15.8 mm	316 mm	0.6/1 kV	None	Standard	Light hoists, AS/RS stacker crane
RST-RC-4C-4.0	4 × 4.0 mm²	19.2 mm	384 mm	0.6/1 kV	None	Standard	Medium EOT crane, spring reels
RST-RC-4C-6.0	4 × 6.0 mm²	22.4 mm	448 mm	0.6/1 kV	None	Standard	Bridge crane, 50–200 m run
RST-RC-4C-10	4 × 10 mm²	27.0 mm	540 mm	0.6/1 kV	None	Standard	Heavy EOT crane, 100–300 m
RST-RC-4C-16	4 × 16 mm²	31.5 mm	630 mm	0.6/1 kV	None	HD Port	Port crane slewing, 200–400 m
RST-RC-K-4C-10	4 × 10 mm² + 4 kN Kevlar	29.2 mm	584 mm	0.6/1 kV	Kevlar 4 kN	HD Port	STS crane, inclined drum
RST-RC-K-4C-16	4 × 16 mm² + 6 kN Kevlar	34.0 mm	680 mm	0.6/1 kV	Kevlar 6 kN	HD Port	STS crane, vertical 300+ m run
RST-RC-CC-4+2	4 × 4.0 mm² + 2 × 1.5 mm² ctrl	24.0 mm	480 mm	0.6/1 kV	None	Standard	Combined power + control, single reel
RST-RC-HV-3C-25	3 × 25 mm²	38.0 mm	760 mm	3.6/6 kV	Optional	HD Port	Medium-voltage mobile substation reel
RST-RC-OEM	2–50 cores, custom	Per spec	Per spec	Up to 6 kV	Per spec	Per spec	Mining (IECEx), offshore, custom drum

Min Drum Core Ø = OD × 20 (standard). For compact drums: specify RST-RC-CD variant, rated to OD × 15. HD Port jacket = Taber ≥500 cycles. All models 100% HiPot tested per IEC 60502-1.

Why Standard Flexible Cables Fail on Drum Reels

Engineers who are sourcing reel cable for the first time frequently ask whether a high-quality drag chain cable or a rubber trailing cable can be used on a motorised drum — usually because there is a cost difference. The answer requires understanding the four mechanical forces that are unique to reel-duty service and absent from every other cable installation type.

Force	What Happens on the Drum	Failure Mode in a Non-Reel Cable	How RST-RC Addresses It
Radial compression	Every winding layer above exerts pressure on the layers below. At 8 layers, inner-layer radial pressure can exceed 3 bar on a 300 mm core drum.	Drag chain cable jackets (Shore A 82–85) deform permanently under sustained compression. Core geometry collapses from circular to oval, creating insulation stress concentrations at conductor crossover points.	RST-RC jacket: Shore A 88±2, compressive set recovery ≥85% after 24 h at 30% compression per ISO 815. Circular cross-section maintained by PP filler cords.
Torsional stress	Each revolution of the drum applies a rotational twist to the cable. In a 500 m run, a drum rotating 0.5 revolutions per traverse adds ±180° of torsion to the free-hanging section.	Short-lay drag chain cables develop helical memory under torsional cycling, preventing level winding on the drum. The cable stacks unevenly, creating high-pressure points that damage insulation.	Counter-helical lay geometry (lay lengths tuned for torsional neutrality per IEC 60228 Annex B). Polyester fleece separator allows cores to rotate relative to jacket.
Guide roller abrasion	The cable contacts a steel or polymer guide roller at every traverse reversal. At 60 cycles/hour over a 10-year crane service life, this is 5.2 million contact events.	Standard PVC jackets (Taber ≤150 cycles) develop surface cracking within 1–2 million contact events. Once the jacket cracks, oil and coolant penetrate to the conductor insulation.	RST-RC jacket: Taber CS-17, 1 kg load, ≥300 cycles (standard) or ≥500 cycles (HD Port grade). Tensile strength ≥55 MPa prevents guide notching.
Tensile loading	The hanging free length of cable exerts sustained longitudinal tension on the drum-end anchor. At 1.4 kg/m and a 200 m free length, this is 280 kg ≈ 2.75 kN.	Copper conductors are not rated for sustained tensile load. IEC 60228 Class 6 copper elongates under sustained tension above ~200 N per core, increasing resistance and creating fatigue break points at flex positions.	Kevlar tensile member (RST-RC-K models) rated 4–6 kN carries the full load. Copper conductors experience zero longitudinal stress. Kevlar load path terminates at cable grip, not at conductor terminations.

Field observation: In our experience reviewing failed cable samples submitted by crane maintenance engineers, over 70% of premature reel cable failures show the same two signatures: permanent jacket ovality (radial compression failure) and conductor strand breaks clustered at the guide roller contact point (abrasion + fatigue). Both are preventable with correct cable specification. Neither would be visible on a new cable — they accumulate silently over 6–18 months before causing a production-stopping fault.

Project References — Where RST-RC Cables Are Deployed

Note: Customer names are withheld at client request. Technical details are accurate and available for verification under NDA.

Project	Application	Cable Specified	Key Challenge Solved	Operating Since
Container terminal, Southeast Asia	4 ship-to-shore (STS) gantry cranes, 320 m drum run per crane	RST-RC-K-4C-16 (6 kN Kevlar, HD Port jacket)	Previous PCP rubber cable was failing every 14 months due to saltwater jacket degradation and guide roller wear. RST-RC has been in service without unplanned replacement.	2021 — ongoing (4+ years)
Steel rolling mill, Central Europe	6 overhead EOT cranes, 180 m drum run, coolant mist environment	RST-RC-4C-10 (standard jacket)	Coolant-induced PVC jacket hardening was causing bi-annual cable replacements. PUR jacket resists water-miscible coolant; no replacement in 3 years of service.	2022 — ongoing
Automated high-bay warehouse, Germany	48 stacker cranes, 80 m drum run each, 1,200 cycles/day	RST-RC-3C-2.5 (compact OD, low mass)	High cycle rate (approx. 8 million cycles over 20-year design life) required validated fatigue data. Rousheng supplied accelerated fatigue test report from CNAS-accredited lab.	2023 — ongoing
Open-cut coal mine, Australia	Dragline bucket wheel, trailing reel, 400 m cable, vertical hang	RST-RC-K-4C-16 + IECEx ATEX Zone 2 compound	Tensile load of 4.2 kN at full extension required Kevlar member. IECEx approval required for coal dust environment. Supplied with DNV load-test certificate.	2022 — ongoing
Tower crane rental fleet, Middle East	Mixed fleet, 18 cranes, 120–200 m drum run, outdoor, UV/heat	RST-RC-4C-6.0 (UV-stabilised PUR compound)	Ambient temperature of 45°C+ causing standard cable jackets to soften and deform on drum. UV-stabilised PUR compound maintains Shore A 88 at +70°C ambient.	2023 — ongoing

Construction — Layer by Layer

Layer	Material / Specification	Standard Reference	Engineering Rationale
Conductor	Bare or tinned OFC. IEC 60228 Class 5 (large x-section, ≥10 mm²) or Class 6 (≤46 mm²). Strand diameter 0.08–0.16 mm. Counter-helical multi-layer winding.	IEC 60228:2004	Class 5 used for 10–25 mm² where Class 6 diameter would be impractical. Counter-helical lay distributes bending stress across all strand layers equally — prevents strand migration under torsional cycling.
Core insulation	PVC type TI5 (standard, rated to +90°C conductor temp) or XLPE (elevated temp, +105°C). DIN VDE 0293-308 colour coding. Min wall thickness per IEC 60502-1 Table 3.	IEC 60502-1:2004, Table 3; DIN VDE 0293-308	PVC TI5 is specified rather than standard TI1 because its higher plasticiser content maintains flexibility at lower temperatures. XLPE is specified for ladle crane and furnace applications where conductor temperature can reach 90°C sustained.
Core cabling + separator	Cores cabled at short lay (lay/OD ratio 10–12:1). Polypropylene filler cords to maintain circular geometry. Polyester fleece separator tape over assembled bundle.	IEC 60502-1 Clause 12	Short lay stabilises conductor position under multi-layer winding compression, preventing insulation stress concentrations. Fleece separator is critical for torsional recovery — it allows the jacket to rotate relative to the core bundle during drum cycling without bonding.
Tensile member (K models)	Parallel-laid aramid (Kevlar 29 or Kevlar 49) yarns or galvanised steel wire rope. Rating: 2 kN, 4 kN, or 6 kN. Positioned symmetrically around core bundle. Load-tested to 1.5× rated load before shipment.	IEC 61537 (guidance); ASTM D7269 (Kevlar yarn tensile)	Kevlar 49 (higher modulus) preferred over Kevlar 29 for deep-mine and STS crane duty where elongation under load must be kept below 1.5% at rated load. Parallel lay (not braided) minimises OD contribution while maximising axial load efficiency.
Filler / bedding	Polypropylene filler cords, sized to fill interstitial spaces. Polyester fleece bedding layer over filler.	IEC 60502-1 Clause 13	Circular cross-section is essential for even winding tension across all drum layers. An oval cable develops localised pressure gradients in inner layers that compress insulation non-uniformly. PP filler adds negligible mass while maintaining circularity.
Outer jacket — PUR	Polyether-based TPU. Shore A 88±2. Tensile strength ≥55 MPa. Elongation at break ≥400%. Compressive set recovery ≥85% (24 h, 30% compression, ISO 815). Taber abrasion CS-17 1 kg: Standard ≥300 cycles; HD Port ≥500 cycles.	ISO 37; ISO 815; ISO 9352 (Taber)	Shore A 88 (vs. 85 used in drag chain grades) provides the additional compressive stiffness needed to resist permanent deformation under winding-layer pressure, while retaining the elongation reserve (400% vs 350%) needed for torsional cycling. Polyether base (vs polyester) maintains these properties after prolonged coolant and saltwater exposure without hydrolytic degradation.

Material Comparison: PUR vs. Rubber vs. Polychloroprene (PCP) for Reel Duty

Three jacket materials are commonly specified for drum reel cables. The table below compares their performance across the properties that matter in reel service — based on published material standards and our internal test data (available on request).

Property	RST-RC Polyether PUR	Rubber (EPR/EPDM)	Polychloroprene (PCP/Neoprene)
Compressive set recovery (30%, 24 h)	≥85% — Excellent	75–80% — Good	65–75% — Moderate
Abrasion resistance (Taber CS-17, 1 kg)	≥300–500 cycles	150–250 cycles	150–200 cycles
Tensile strength	≥55 MPa	8–15 MPa	10–18 MPa
Cold-flex rating	−40°C (standard)	−40°C (EPR grade)	−30°C (standard)
Hydrolysis resistance	Excellent (polyether base)	Excellent	Good
Mineral oil resistance	Excellent	Moderate (EPR swells)	Good (PCP is oil-resistant grade)
Saltwater immersion (1,000 h)	No degradation (tested)	Minimal degradation	Moderate surface oxidation
UV / ozone resistance	Moderate (standard); Good (UV grade)	Good (EPDM)	Good
Max. continuous operating temp (jacket)	+105°C	+90°C (EPR)	+80°C
Cable mass per metre (4 × 10 mm² equiv.)	Lowest (thin-wall possible)	Highest (thick wall needed for abrasion)	Intermediate
Typical service life on drum reel	8–12 years	4–8 years	4–6 years
IECEx / ATEX availability	Yes (on request)	Yes	Yes

Taber data: Rousheng internal test per ISO 9352. Tensile strength: ISO 37. Compressive set: ISO 815. Service life is estimated from accelerated aging and field data — actual life depends on drum speed, winding layers, and environment.

Technical Parameters

Electrical

Parameter	Standard RST-RC	MV Option	Reference
Rated voltage (Uo/U)	0.6/1 kV	3.6/6 kV	IEC 60502-1
Test voltage	3.5 kV AC/5 min	10 kV AC/5 min	IEC 60502-1 Cl.17
Insulation resistance	≥100 MΩ·km	≥200 MΩ·km	IEC 60502-1 Cl.18
Conductor resistance	Per Class 5 or Class 6 table	Certified per drum	IEC 60228:2004
Current derating — drum	Factor 0.80 vs. free-air rating	Same	IEC 60364-5-52 Annex B, item 52
Max VD guideline	<5% at rated current, full run length	<3% MV	IEC 60364-5-52

Mechanical & Environmental

Parameter	Value	Reference / Test Method
Min. drum core diameter (standard)	20 × cable OD	Internal; aligned with IEC 62440 guidance
Min. drum core diameter (compact)	15 × cable OD (RST-RC-CD variant)	Internal fatigue validation
Tensile member rating (K models)	2 kN / 4 kN / 6 kN; load-tested to 1.5×	ASTM D7269; certified per drum
Winding layers — standard jacket	Up to 6 layers validated	Internal compression test
Winding layers — HD Port jacket	Up to 10 layers validated	Internal compression test
Torsion rating	±180°/m of free cable	Internal torsion rig, 10,000 cycles
Jacket tensile strength	≥55 MPa	ISO 37
Jacket elongation at break	≥400%	ISO 37
Jacket Shore A hardness	88 ± 2	ISO 868
Compressive set recovery	≥85% (24 h, 30% deformation)	ISO 815
Abrasion (standard jacket)	≥300 cycles CS-17, 1 kg	ISO 9352
Abrasion (HD Port jacket)	≥500 cycles CS-17, 1 kg	ISO 9352
Oil resistance	No swelling after 70 h at 70°C in IRM 903 oil	IEC 60811-406
Saltwater immersion	No jacket degradation after 1,000 h	Internal; per IEC 60811-501
Operating temp (dynamic)	−40°C to +90°C (standard PUR)	IEC 60811-501
Operating temp (XLPE insulation)	−40°C to +105°C conductor	IEC 60502-1
Flame retardancy	IEC 60332-1 (single); IEC 60332-3-24 Cat. C (bundle, on request)	IEC 60332
UV stability (standard)	500 h xenon arc, no cracking	IEC 60811-401
UV stability (marine grade)	1,000 h xenon arc, ≤80% tensile retention	IEC 60811-401

Five-Step Drum Sizing Guide

Correct specification requires five inputs that do not arise in fixed-wiring or drag chain applications. Gathering all five before requesting a quotation eliminates revision cycles and allows our engineering team to issue a binding technical proposal in a single response.

Step	Input Required	How to Measure It	Impact on Specification
1	Drum core diameter (mm)	Measure the barrel inner diameter of the empty reel drum	Sets minimum cable OD: cable OD ≤ drum core ÷ 20 (std) or ÷ 15 (compact)
2	Total cable run length at max travel (m)	Measure or calculate from drum to load connector at full extension	Determines conductor cross-section via VD calculation (see below)
3	Operating current (A) and voltage (V)	From motor nameplate or load calculation; use 1.25× FLA for sizing if motor load	Combined with length, sets minimum conductor cross-section
4	Winding layers or drum geometry	Either: number of layers, OR drum traverse width (mm) and drum core-to-flange height (mm)	>6 layers → HD Port jacket required. >10 layers → contact engineering for compression analysis
5	Hanging cable weight / tensile load (kg or N)	Cable length beyond drum at maximum extension × cable mass per metre	If tensile load exceeds 300 N → Kevlar K model required

Worked Example — Port Crane, 280 m Run, 80 A Load

Given: EOT crane, 280 m cable run, 80 A at 400 V 3ϕ, 8 winding layers, 350 mm drum core diameter, 230 m free-hanging at maximum travel.

Step 1 — Drum core check:

Min cable OD = 350 mm ÷ 20 = 17.5 mm. So any model with OD ≤ 17.5 mm is compatible for standard ratio. RST-RC-4C-4.0 (19.2 mm) is too large. RST-RC-3C-2.5 (15.8 mm) is within limit but under-rated for 80 A. We need to check a larger cross-section against the compact ratio: 350 ÷ 15 = 23.3 mm. RST-RC-4C-6.0 at 22.4 mm qualifies under compact drum spec → specify RST-RC-CD-4C-6.0.

Step 2 — Voltage drop (VD) check:

VD formula (3-phase): VD% = (√3 × I × L × R_conductor) ÷ (1000 × U) × 100

For 6 mm² copper: R = 3.30 mΩ/m (IEC 60228 Class 5 max). Drum derating: actual resistance = 3.30 × 1/0.80 = 4.125 mΩ/m equivalent for current capacity, but VD uses actual resistance value 3.30 mΩ/m.

VD% = (1.732 × 80 × 280 × 3.30) ÷ (1,000 × 400) × 100 = 8.02% → Exceeds 5% limit.

Step up to 10 mm²: R = 1.91 mΩ/m. VD% = (1.732 × 80 × 280 × 1.91) ÷ 400,000 × 100 = 4.64% → Within 5% limit. ✔

Step 3 — Current capacity:

RST-RC-4C-10 at 0.6/1 kV: free-air rating ~65 A (IEC 60364-5-52, method E). Drum derating factor 0.80 → drum-rated current = 52 A. Insufficient for 80 A.

Step up to 16 mm²: free-air ~85 A × 0.80 = 68 A. Still short. Check 25 mm²: 112 A × 0.80 = 89.6 A → ✔. Specify RST-RC-4C-16 (upgrade cross-section to pass current derating).

Step 4 — Winding layers:

8 layers → above 6-layer standard threshold → HD Port jacket (Taber ≥500 cycles) required.

Step 5 — Tensile load:

Free-hanging at max travel: 230 m × RST-RC-4C-16 mass ≈16.2 kg/100 m = ~37 kg/100 m → 230 m × 0.37 kg/m ≈ 85 kg ≈ 833 N. Exceeds 300 N threshold. → Specify Kevlar K model (4 kN rated; FS 4.8× at 833 N load).

Final specification: RST-RC-K-4C-16, HD Port jacket, compact drum variant (RST-RC-CD suffix). 4 × 16 mm² + 4 kN Kevlar, OD 31.5 mm (fits 350 mm drum at 11× ratio under compact spec). VD 2.84%, drum-rated current 89.6 A, tensile FS 4.8×.

FAQ — Questions from Engineers & Procurement Teams

Q1: What is the maximum number of winding layers a PUR reel cable can handle?

Standard polyether PUR jackets (Shore A 85–88) are validated for up to 6 winding layers based on radial compression modelling and accelerated compression-set testing per ISO 815. Beyond 6 layers, the compressive stress on the innermost layer at maximum drum loading can cause permanent jacket deformation if the compound is not specified for it. The RST-RC HD Port jacket (Shore A 90, compressive set recovery ≥90%) extends this to 10 validated layers. For applications with more than 10 winding layers, submit your drum geometry drawing to our engineering team — we will calculate peak radial pressure on the inner layer and specify the appropriate jacket wall thickness and compound.

Q2: How do I calculate the tensile load on a vertical drum reel application?

The tensile load at the drum anchor point equals the total mass of the free-hanging cable section multiplied by 9.81 m/s², plus any additional load from tensioned festoon spring or reel motor holding torque. For the cable itself: tensile load (N) = free-hanging length (m) × cable mass per metre (kg/m) × 9.81. Cable mass per metre is listed in our product data sheet for each model. As a rule of thumb, if tensile load exceeds 300 N, specify the Kevlar RST-RC-K variant. We load-test every K-model drum to 1.5× rated load before shipment and provide a signed test certificate.

Q3: What current derating factor should I apply for cables wound on a drum reel?

IEC 60364-5-52 Annex B (item 52) specifies that cables wound on a drum in multiple layers should be derated by a factor of 0.80 relative to their free-air single-cable rating (installation method E). This factor applies regardless of the number of winding layers, as long as the drum is stationary during current-carrying duty. If the drum is rotating while carrying full load current — as in some dynamic reel applications — additional derating may be required; contact our engineering team for the specific case. Note: the 0.80 derating applies to current rating only. Voltage drop calculations use the actual conductor resistance (the measured value, not a derated value).

Q4: Can a PUR jacket cable be repaired mid-length if the jacket is damaged on the drum?

A heat-shrink jointing sleeve with a PUR-compatible adhesive liner (such as TE Raychem MVOU or equivalent) will form a mechanically sound repair if correctly installed. However, reel-duty repairs have two constraints that fixed-wiring repairs do not: the joint must be positioned in the outer winding layers (layers 4 and above on a 6-layer drum) where radial compression is lowest; and the joint OD must not exceed the cable OD by more than 20%, otherwise it will jam in the drum guide or create uneven winding tension. We do not recommend jointing in inner layers — contact us for cut-to-length replacement drums for inner-layer damage.

Q5: What is the difference between Class 5 and Class 6 conductors for reel cable applications?

Both IEC 60228 Class 5 and Class 6 are stranded copper conductors designed for flexible duty. Class 5 uses coarser stranding (more strands of larger diameter) and is typically used in cross-sections of 10 mm² and above in reel cable, where achieving Class 6 stranding would add significant OD and mass without a proportionate improvement in flex life. Class 6 (ultra-fine stranding, 0.05–0.08 mm individual strand diameter) is specified in cross-sections up to 6 mm² for high-cycle reel applications where minimum bend radius is critical. For the RST-RC series, we use Class 6 for ≤6 mm² and Class 5 for ≥10 mm². Both classes are validated for the torsional cycling inherent in drum reel service.

Q6: Is a PUR reel cable compatible with variable frequency drives (VFDs)?

The cable itself is compatible, but VFD applications introduce two considerations that affect cable selection. First, VFDs generate high-frequency voltage spikes (dV/dt) that accelerate insulation aging in standard PVC; PUR-insulated or XLPE-insulated cores are more resistant. Second, VFDs generate common-mode currents that require an overall shielded cable (or a dedicated earth conductor sized to IEC 60364-5-54) to prevent shaft bearing currents in the driven motor. For reel cable in VFD applications, specify the shielded variant (RST-RC-CY suffix) with a tinned copper braid shield (≥85% optical coverage) connected at both ends to a low-impedance earth.

Manufacturer Background — Shanghai Rousheng Wire & Cable

Production capabilities

Dedicated large-section extrusion lines (up to 25 mm² per core)

Drum winding facility: single lengths to 1,000 m

In-house Kevlar tensile member assembly and load testing

100% HiPot test on all finished lengths (IEC 60502-1 Cl.17)

Conductor resistance certificate issued per drum

Batch-level material traceability; records retained 10 years

Certifications & approvals

ISO 9001:2015 (production QMS)

CE LVD Directive 2014/35/EU

RoHS 2 / REACH SVHC compliance

IECEx / ATEX Zone 1 & 2 (on request, mining/petrochem)

DNV / Bureau Veritas type approval (marine, on request)

CNAS-accredited lab test reports available on request

Our engineering team has reviewed drum reel cable failures across crane, mining, and intralogistics applications for over a decade. When customers submit failed cable samples for analysis, we provide a written failure mode report identifying the root cause and the specification change that would have prevented it — at no charge, regardless of whether the original cable was supplied by Rousheng. This practice reflects our engineering-led approach and is the basis of the project references listed in Section 5.