Continuous-length replacement cable for Xylem Flygt pump 3400/883 with motor M54-60-6MDY/04 (250 kW, 6000 V, 50 Hz) — replaces original Xylem part no. 950023.
Medium-Voltage Submersible Pump Motor CableFC-FLX™ SUB-MV (N)TSCGEWÖU 6/10 kV 3×50 + 2×25/2 + S(4×0.5) mm²
Continuous-length replacement cable for Xylem Flygt pump 3400/883 with motor M54-60-6MDY/04 (250 kW, 6000 V, 50 Hz) — replaces original Xylem part no. 950023.
1Application and scope
This datasheet defines a flexible medium-voltage power cable with integrated screened control pairs, built to the (N)TSCGEWÖU design principle of DIN VDE 0250-813 for heavy-duty rubber-insulated flexible cables. It is engineered as a direct replacement for the original supply cable of a Flygt 3400/883 submersible pump, for continuous operation with a 6000 V three-phase motor while permanently immersed in water.
The construction matches the requirement exactly: three 50 mm² phase conductors, two split earth conductors totalling 25 mm², and one S(4×0.5) control element made of four copper conductors arranged as two twisted pairs under a common screen. No optical fibres, no external control cable and no 3×50+3×25/3 substitution are used.
2Motor and duty data used for the design check
| Parameter | Value (as confirmed by buyer) | Parameter | Value |
|---|---|---|---|
| Pump model | Flygt 3400/883 | Rated current | ≈ 30 A |
| Motor model | M54-60-6MDY/04 | Speed | 995 rpm |
| Rated power | 250 kW | Power factor | cos φ 0.83 |
| Rated voltage | 6000 V, 3~, 50 Hz | Max. liquid temperature | 40 °C |
| Connection | Star (Y) | Reference / serial no. | 2431110 |
| Original cable | NTSCGEWÖU / NTSCGEWCOEUS | Original Xylem P/N | 950023 |
3Cable cross-section
| Pos. | Element | Material / design |
|---|---|---|
| 1 | Phase conductor 3 × 50 mm² | Tinned annealed copper, class 5 (IEC 60228) |
| 2 | Conductor screen | Extruded semi-conductive EPR |
| 3 | Insulation | EPR type 3GI3, 3.4 mm nominal |
| 4 | Insulation screen | Extruded semi-conductive EPR, triple extruded with 2 and 3 |
| 5 | Earth conductor 2 × 25/2 mm² | Tinned copper class 5, 2 × 12.5 mm² split in interstices |
| 6 | Earth covering | Semi-conductive rubber |
| 7 | Control conductors S(4×0.5) | Tinned Cu class 5, EPR insulated, 2 twisted pairs |
| 8 | Common screen | Tinned copper braid, ≥ 85 % coverage + drain contact |
| 9 | Control element sheath | Semi-conductive / rubber sheath |
| 10 | Filler and centre | Rubber filling compound, water-blocking |
| 11 | Inner sheath | Rubber compound, extruded into interstices |
| 12 | Anti-torsion reinforcement | High-tenacity polyester braid |
| 13 | Outer sheath | CPE heavy-duty rubber, 5GM5 grade, black |
| 14 | Outer surface / marking | Embossed legend and metre marks |
4Construction details
| Element | Specification | Nominal value |
|---|---|---|
| Phase conductors | Tinned annealed copper, flexible class 5, IEC 60228 | 3 × 50 mm², Ø ≈ 9.2 mm |
| Conductor screen | Semi-conductive EPR, extruded | ≈ 0.6 mm |
| Insulation | EPR 3GI3, DIN VDE 0207-20; 90 °C rated | 3.4 mm nominal |
| Insulation screen | Semi-conductive EPR, extruded, strippable | ≈ 0.6 mm |
| Diameter over core | Triple-extruded, dry-cured (CCV) | ≈ 18.6 mm |
| Phase core identification | Printed numbers on semi-conductive screen | 1 · 2 · 3 (L1 · L2 · L3) |
| Earth conductors | Two tinned copper class 5 conductors in outer interstices, each with semi-conductive rubber covering | 2 × 12.5 mm² (Σ 25 mm²) |
| Control element S(4×0.5) | 4 × 0.5 mm² tinned copper class 5, EPR insulated; two twisted pairs; common tinned-copper braid screen; semi-conductive/rubber sheath; placed in third interstice | Ø ≈ 8.4 mm |
| Control core colours | Pair A: white / brown · Pair B: green / yellow (DIN 47100) | + printed 1–4 |
| Lay-up | Three phase cores, earths and control element stranded with short lay length; water-blocking rubber filler | Ø ≈ 40.1 mm |
| Inner sheath | Rubber compound, extruded to fill interstices | ≈ 2.0 mm |
| Reinforcement | Polyester anti-torsion braid between sheaths | ≈ 0.5 mm |
| Outer sheath | CPE-based heavy-duty rubber, 5GM5 grade (DIN VDE 0207-21); water, oil, ozone and UV resistant; flame retardant | ≈ 3.5 mm, black |
5Dimensions and weights
| Characteristic | Value | Remark |
|---|---|---|
| Overall diameter, nominal | 52.0 mm | Measured to IEC 60811-201/-203 |
| Overall diameter, tolerance | ± 1.5 mm (50.5 – 53.5 mm) | Guaranteed range on the supplied drum |
| Cable weight, nominal | ≈ 4.25 kg/m (4,250 kg/km) | Tolerance ± 5 % |
| Copper content | ≈ 1.62 kg/m | Phase + earth + control |
| Net weight, 180 m | ≈ 765 kg | Cable only |
| Net weight, 200 m | ≈ 850 kg | Cable only |
6Electrical characteristics
| Characteristic | Value |
|---|---|
| Rated voltage U0/U (Um) | 6/10 (12) kV, AC |
| Routine AC test voltage, core to core and to earth | 21 kV (3.5 U0), 5 min |
| Partial discharge at 1.73 U0 (10.4 kV) | ≤ 10 pC |
| Max. DC resistance, phase conductor at 20 °C | 0.393 Ω/km |
| Max. DC resistance, earth (2 × 12.5 mm² in parallel) at 20 °C | 0.795 Ω/km |
| Max. DC resistance, control conductor 0.5 mm² at 20 °C | 40.1 Ω/km |
| Insulation resistance at 20 °C (power cores) | ≥ 2,000 MΩ·km |
| Capacitance per core, approx. | 0.33 µF/km |
| Inductance per phase, approx. | 0.34 mH/km |
| Current rating, in air 30 °C / immersed in water ≤ 40 °C | 180 A / 180 A |
| Short-circuit current, phase conductor (1 s, 90 → 250 °C) | 7.15 kA |
| Control element rating / test voltage | 300/500 V · 2 kV AC, 5 min |
7Mechanical, thermal and immersion characteristics
| Characteristic | Value |
|---|---|
| Min. bending radius, fixed installation (6 × D) | 315 mm |
| Min. bending radius, during handling / pump lifting (10 × D) | 520 mm |
| Max. conductor temperature, continuous / short circuit | +90 °C / +250 °C |
| Ambient temperature, flexing / fixed | −25 … +60 °C / −40 … +60 °C |
| Water temperature, permanent immersion | up to +40 °C (motor limit) |
| Max. permanent immersion depth | 100 m water column (1.0 MPa) |
| Max. static tensile load on phase conductors (15 N/mm²) | 2,250 N |
| Flame propagation | IEC 60332-1-2 |
| Oil, ozone and UV resistance | Yes (5GM5 / CPE) |
8Application engineering check for the Flygt 6000 V motor
8.1 Voltage class selection
The motor’s rated voltage of 6000 V is the phase-to-phase voltage U. A 3.6/6 kV cable (Um 7.2 kV) is rated exactly at the motor voltage and leaves only the IEC voltage-tolerance margin. A 6/10 kV cable (Um 12 kV) gives a thicker EPR wall, a lower electrical stress in permanent immersion and a large reserve against supply over-voltage, switching transients and long-term water ageing. FeiChun recommends 6/10 kV for this duty, and this datasheet is based on it.
8.2 Current-carrying capacity
Motor current ≈ 30 A versus 180 A rating of 3 × 50 mm² — a utilisation of about 17 %. Conductor operating temperature will stay close to the water temperature.
8.3 Voltage drop over 180 m / 200 m
ΔU = √3 · I · L · (R90 cos φ + X sin φ), with I = 30 A, R90 ≈ 0.50 Ω/km, X ≈ 0.10 Ω/km, cos φ = 0.83:
| Length | ΔU | ΔU as % of 6000 V | Result |
|---|---|---|---|
| 180 m | ≈ 4.4 V | ≈ 0.07 % | Negligible |
| 200 m | ≈ 4.9 V | ≈ 0.08 % | Negligible |
8.4 Earth and control functions
The two split earth conductors (Σ 25 mm²) are embedded in semi-conductive rubber in contact with the core screens, forming the protective-earth and screen-return path required for 6 kV operation. The S(4×0.5) screened pairs carry the motor’s monitoring circuits (thermal and leakage sensors) with their common screen protecting them from the adjacent 6 kV field.
8.5 Cable entry
The overall diameter of 52.0 ± 1.5 mm is designed to suit the original Flygt MV cable entry. The cable is terminated in the entry with a Flygt grommet/seal sleeve matched to the measured OD; FeiChun will confirm the final OD against the original cable marking and entry photographs before production starts.
9Factory tests and test reports supplied
| Test | Method / criterion | Report |
|---|---|---|
| High-voltage AC withstand | 21 kV, 5 min, each core to all others and earth — no breakdown | Supplied |
| Partial discharge | IEC 60885-3; ≤ 10 pC at 1.73 U0 | Supplied |
| Insulation resistance | 500/2500 V DC, corrected to 20 °C; ≥ 2,000 MΩ·km | Supplied |
| Water immersion test | Full drum length immersed in water, then HV and insulation resistance repeated — no breakdown, no IR drop beyond limit | Supplied |
| Conductor resistance | IEC 60228 limits, all phase, earth and control conductors | Supplied |
| Control element | Continuity, pair identity, screen continuity, 2 kV AC test | Supplied |
| Dimensional check | OD, insulation and sheath thickness, length and joint-free confirmation | Supplied |
A complete factory test report and inspection certificate is issued for the actual drum and sent with the shipping documents. Sample reports from previous production of the same design can be provided before the order is placed.
10Supply, marking and packing
| Item | Detail |
|---|---|
| Delivery length | One continuous length of 180 m or 200 m on one drum, without joints or repairs (no minimum order quantity applies) |
| Sheath marking | FEICHUN FC-FLX™ SUB-MV (N)TSCGEWÖU 6/10 kV 3×50+2×25/2+S(4×0.5) 2026 + metre marks |
| Drum | Steel-reinforced wooden drum, barrel Ø ≥ 1,100 mm; cable ends sealed with heat-shrink caps; drum lagged |
| Drum size / gross weight (est.) | Flange ≈ Ø 1,800 × W 1,100 mm · ≈ 1,150 kg (180 m) / ≈ 1,250 kg (200 m) |
| HS code | 8544.60 |
11Written confirmation of suitability
SPECIAL
CABLES
QA
Declaration of suitability — FC-TDS-SUB-2026-969E
Anhui FeiChun Special Cable Co., Ltd. hereby confirms that the cable FC-FLX™ SUB-MV (N)TSCGEWÖU 6/10 kV 3×50+2×25/2+S(4×0.5) mm², manufactured to this datasheet:
- is suitable for continuous operation with the Flygt 3400/883 pump and motor M54-60-6MDY/04, 250 kW, 6000 V, 3~, 50 Hz, star connection, rated current ≈ 30 A;
- is suitable for permanent immersion in water at up to 40 °C and up to 100 m depth;
- has EPR insulation and a waterproof CPE rubber outer sheath, and contains the S(4×0.5) control element as two copper twisted pairs with a common screen, with no optical fibres;
- is designed to fit the original Flygt cable entry, and will be supplied as one continuous 180 m or 200 m length without joints.
Anhui FeiChun Special Cable Co., Ltd.
International Business Department · Hefei, Anhui Province, China
www.feichuncables.com
Technical: [email protected]
Mining & pump cables: [email protected]
Sales: [email protected]
WhatsApp: +86 138 5512 3218
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