ZR-YJV 4×25mm² Flame Retardant Copper Power Cable, 0.6/1kV XLPE Insulated PVC Sheath
ZR-YJV 4×25mm² Flame Retardant Copper Power Cable, 0.6/1kV XLPE Insulated PVC Sheath
Product Summary
ZR-YJV 4×25mm² Flame Retardant Copper Power Cable, 0.6/1kV XLPE Insulated PVC Sheath Code Mean:ZR-Flame Retardant,YJ-XLPE Insulated,V-PVC Sheath ZR-YJV 4×25 mm² — Product Engineering File 1. Product Summary. ZR-YJV 4×25 is a four-core flame-retardant low-voltage cable — four 25 mm² copper conductors...
Product Details
Highlight:
zr-yjv 4 cores cable
,zr-yjv 25 sq mm 4 core cable
,copper 4 cores cable
Conductor (×4):
Bare Annealed Copper, Class 2 Stranded, 7×∅2.14 Mm, Conductor Ø ≈ 6.4 Mm
Conductor nominal area (per core):
25 Mm²
Number of cores:
4
Conductor construction:
Class 2, 7×∅2.14 Mm,min. 7 Wires
Conductor diameter (approx.):
6.4mm
Insulation (×4):
XLPE
Insulation thickness:
0.9 Mm (25 Mm² Class)
Diameter over insulated core:
8.2 Mm,6.4 + 2×0.9
Filler / binder:
FR PP Filler + FR Tape
Outer sheath:
Flame-retardant PVC (ZR Grade)
Sheath thickness:
1.8 Mm (multi-core Rule, ≥1.8 Mm)
Overall cable diameter:
20.5 – 22.0 Mm
Approx. weight:
620 – 700 Kg/km
Long-term service temp.:
90 °C
Short-circuit temp. (≤5 s):
250 °C
Emergency overload:
105–130 °C
Routine test:
3.5 KV AC / 5 Min; Type Test 4.0 KV
Volume resistivity @90 °C:
≥ 10¹² Ω·cm
Product Description
ZR-YJV 4×25mm² Flame Retardant Copper Power Cable, 0.6/1kV XLPE Insulated PVC Sheath
Code Mean:ZR-Flame Retardant,YJ-XLPE Insulated,V-PVC Sheath
ZR-YJV 4×25 mm² — Product Engineering File
1. Product Summary. ZR-YJV 4×25 is a four-core flame-retardant low-voltage cable — four 25 mm² copper conductors, XLPE insulation, PVC sheath, rated 0.6/1 kV (Um = 1.2 kV), 50 Hz. Standards: GB/T 12706.1 / IEC 60502-1, conductors GB/T 3956 / IEC 60228, fire rating GB/T 19666 / GB/T 18380 (default ZC).
2. Construction Overview. Layer stack, conductor to jacket:
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor (×4) | Annealed copper, Class 2, 7 × 2.14 mm (7/2.14) each, 25 mm² per core | — | ≈ 6.40 mm per core |
| Insulation (×4) | Cross-linked polyethylene | 0.9 mm | ≈ 8.20 mm per core (over ins.) |
| Lay-up | Four cores + central filler + binder tape | — | ≈ 19.8 mm |
| Sheath | Flame-retarded PVC, ST2, black | 1.8 mm | ≈ 24.3 mm overall |
Approx. weight ≈ 1222 kg/km (Al version ≈ 577.6 kg/km).
3. Electrical Ratings. DC resistance ≤ 0.727 Ω/km per core @ 20 °C; routine 3.5 kV / 5 min; XLPE volume resistivity ≥ 1×10¹² Ω·cm; typical insulation resistance ≥ 36.7 MΩ·km; capacitance ≤ 0.45 μF/km per core. Reference ampacity (all four cores loaded) ≈ 105 A in air / 125 A direct-buried @ 25 °C (Mingda; Lvbao 5×25 agrees at 105/125 A, Tongding 3×25+2×16 ≈ 107/130 A) — derate per GB/T 16895 / IEC 60364.
|
Parameter |
Value |
Note |
|---|---|---|
|
Rated voltage U₀/U |
0.6 / 1 kV |
Uₘ = 1.2 kV |
|
Test voltage AC (5 min) |
3.5 kV |
Routine |
|
Type-test voltage |
4.0 kV |
IEC 60502 |
|
DC resistance @20 °C (Class 2 Cu, per core) |
≤ 0.749 Ω/km |
GB/T 3956 max |
|
AC resistance @90 °C (est.) |
≈ 0.973 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 4-core) |
≈ 75 – 85 A |
design ≈ 80 A |
|
Direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) |
≈ 92 – 105 A |
design ≈ 98 A |
|
Short-circuit current (1 s, Cu, 250 °C, per core) |
≈ 2.50 kA |
reference |
|
Frequency |
50/60 Hz AC |
— |
4. Thermal & Bending. Continuous 90 °C; short-circuit 250 °C (≤ 5 s); ambient −20 to +45 °C; laying ≥ 0 °C; minimum bend radius ≥ 15 × OD (multi-core).
| ZR-YJV 4×25 mm² Flame-Retardant Copper-Conductor XLPE-Insulated PVC-Sheathed Power Cable — Product Parameters (0.6/1 kV, Four-Core) | |||||
| Construction: CU / XLPE / PVC, 4 cores • Standards: GB/T 12706.1, IEC 60502-1 (cable), GB/T 3956 (conductor), GB/T 19666 & GB/T 18380 (flame retardance) • Nominal values for reference — confirm against factory test certificate | |||||
| No. | Category | Parameter | Value | Unit | Notes / Standard Reference |
| A. Product Identification | |||||
| 1 | Identification | Product name | Flame-retardant copper-conductor XLPE-insulated PVC-sheathed power cable (four-core) | — | Designation ZR-YJV; "ZR" = flame-retardant (halogen-containing) |
| 2 | Identification | Model designation | ZR-YJV 4×25 | — | 4 cores × 25 mm²; Cu / XLPE / PVC |
| 3 | Identification | Design standards | GB/T 12706.1; IEC 60502-1 | — | Conductor: GB/T 3956 / IEC 60228; flame retardance: GB/T 19666, GB/T 18380 |
| 4 | Identification | Rated voltage U0/U | 0.6/1 | kV | Max system voltage Um = 1.2 kV |
| 5 | Identification | Rated frequency | 50 | Hz | AC power distribution |
| 6 | Identification | Number of cores | 4 | — | Four-core cable; three phase conductors (L1/L2/L3) + neutral (N) |
| 7 | Identification | Nominal cross-sectional area | 25 | mm² | Per core; nominal cross-section per GB/T 3956 |
| B. Cable Construction (from conductor to outer sheath) | |||||
| 8 | Conductor | Material | Plain annealed copper (Cu) | — | High-conductivity electrolytic / oxygen-free copper |
| 9 | Conductor | Conductor class | Class 1 or Class 2 (typical: Class 2, stranded) | — | GB/T 3956 / IEC 60228 |
| 10 | Conductor | Typical stranding construction (per core) | 7 wires × 2.14 mm (7/2.14) | — | Class 2 round stranded; nominal section 25 mm² per core |
| 11 | Conductor | Conductor diameter (per core) | ≈ 6.40 | mm | Ø of the 7/2.14 stranded core (6.3–6.5 mm across practice) |
| 12 | Conductor | Max. DC resistance of conductor at 20 °C | 0.727 | Ω/km | GB/T 3956, Class 2 copper; acceptance criterion for 25 mm² |
| 13 | Insulation | Material | Cross-linked polyethylene (XLPE) | — | Thermally cross-linked; natural/transparent colour |
| 14 | Insulation | Nominal insulation thickness | 0.9 | mm | GB/T 12706.1 / IEC 60502-1 (0.6/1 kV, 25 mm²) |
| 15 | Insulation | Diameter over insulation (per core) | ≈ 8.20 | mm | ≈ 6.40 + 2 × 0.9 (calculated) |
| 16 | Lay-up | Core assembly | Four insulated cores laid up around a central non-hygroscopic filler; binder tape over the bundle | — | Round construction, right-hand lay; classic 4-core geometry |
| 17 | Sheath | Material | Flame-retardant polyvinyl chloride (PVC, ST2 type) | — | Colour: black (or as ordered) |
| 18 | Sheath | Nominal sheath thickness | 1.8 | mm | GB/T 12706.1 / IEC 60502-1 (Mingda four-core table) |
| 19 | Dimensions | Approx. overall diameter | ≈ 24.3 | mm | Mingda 24.3 (four-core unarmored) |
| 20 | Dimensions | Approx. cable weight | ≈ 1222 | kg/km | Mingda 1222 (aluminium version ≈ 577.6 kg/km) |
| C. Electrical Performance | |||||
| 21 | Electrical | Max. DC conductor resistance at 20 °C | 0.727 | Ω/km | GB/T 3956; routine measurement (per core) |
| 22 | Electrical | Power-frequency withstand voltage (routine test) | 3.5 kV / 5 min, no breakdown | — | AC 50 Hz; per GB/T 12706.1 / IEC 60502-1 |
| 23 | Electrical | Insulation resistance (finished cable, 20 °C) | ≥ 36.7 | MΩ·km | Typical finished-cable reference for 0.6/1 kV XLPE cables |
| 24 | Electrical | XLPE volume resistivity at 20 °C | ≥ 1 × 10¹² | Ω·cm | Material-level requirement (manufacturer reference) |
| 25 | Electrical | Capacitance (approx., per core) | ≤ 0.45 | μF/km | Manufacturer reference value |
| 26 | Electrical | Reference ampacity — in air, 25 °C, four cores loaded | ≈ 105 | A | Mingda 105 A; Lvbao 5×25 also 105 A @25 °C — derate per GB/T 16895 / IEC 60364 |
| 27 | Electrical | Reference ampacity — direct burial, 25 °C | ≈ 125 | A | Mingda 125 A; Lvbao 5×25 125 A; Tongding 3×25+2×16 ≈ 130 A — depends on soil thermal resistivity |
| D. Thermal Performance | |||||
| 28 | Thermal | Max. continuous conductor temperature | 90 | °C | XLPE insulation temperature class |
| 29 | Thermal | Max. conductor temperature under short-circuit (≤ 5 s) | 250 | °C | Per GB/T 12706.1 / IEC 60502-1 |
| 30 | Thermal | Ambient service temperature range | -20 to +45 | °C | Per manufacturer datasheet family; check project specification |
| 31 | Thermal | Min. installation (laying) temperature | 0 | °C | Pre-heat the cable if ambient is below 0 °C |
| E. Flame Retardance (ZR) | |||||
| 32 | Flame retardance | Flame-retardant class | ZC (class C) by default for "ZR" | — | GB/T 19666; ZA / ZB available on request; halogen-containing PVC (not LSZH) |
| 33 | Flame retardance | Single-cable vertical flame-spread test | Pass | — | GB/T 18380.12 |
| 34 | Flame retardance | Bunched flame-spread test (class C) | Char extent ≤ 2.5 m above burner bottom edge | — | GB/T 18380.35: non-metallic volume ≥ 1.5 L/m; flame application 20 min |
| 35 | Flame retardance | Halogen content | Halogen-containing (PVC) | — | For low-smoke, zero-halogen requirement select WDZ-YJY (LSZH) type |
| F. Installation | |||||
| 36 | Installation | Min. bending radius — multi-core cable | ≥ 15 × OD | — | GB 50168 practice for multi-core XLPE cables; OD = actual cable diameter |
| 37 | Installation | Laying methods | Conduit, tray, cable trench, duct, building trunking, supported/suspended aerial | — | Also direct burial with mechanical protection where permitted |
| 38 | Installation | Site withstand test after installation | DC 4U0 = 2.4 kV, 15 min (recommended) | — | Per utility procurement standard Q/GDW 13244.1-2018; practice may vary by project |
| G. Packing & Delivery | |||||
| 39 | Packing | Standard delivery length | 100 m per coil/drum (or as ordered) | — | Typical industry practice; custom lengths available |
| 40 | Packing | Cable marking | Model, rated voltage, manufacturer, year of manufacture, sequential length marks | — | Per GB/T 6995 / project specification |
| 41 | Packing | Packing form | Coil (carton drum) / wooden drum / export packing | — | As per customer requirement |
5.Test Parameters
| ZR-YJV 4×25 mm² — Test / Verification Parameters (per GB/T 12706.1 & IEC 60502-1) | ||||
| Test Stage | Test Item | Method / Standard | Requirement / Acceptance Criterion | Notes |
| Routine test | Conductor DC resistance measurement | GB/T 3956 (IEC 60228) | ≤ 0.727 Ω/km at 20 °C (per core) | Measured on every production length |
| Routine test | Power-frequency withstand voltage | GB/T 12706.1 / IEC 60502-1 | 3.5 kV AC, 5 min, no breakdown | Applied between each conductor and earth/water; 50 Hz |
| Routine test | Construction check — insulation & sheath thickness, outer diameter | GB/T 2951 | Within GB/T 12706.1 tolerances | Insulation ≥ 0.9 mm nominal; sheath ≥ 1.8 mm nominal |
| Sample test | Hot set (thermal elongation) test — XLPE insulation | GB/T 12706.1 §16.3.13 / GB/T 2951.11 | 200 ± 3 °C, 15 min, stress 0.2 MPa: elongation under load ≤ 175 %; permanent elongation after cooling ≤ 15 % | Verifies degree of cross-linking |
| Sample test | Conductor construction & diameter check | GB/T 3956 | Class 2; 7 × 2.14 mm; Ø ≈ 6.40 mm | Sampled per batch |
| Type test | Single-cable vertical flame-spread test (flame retardance) | GB/T 18380.12 | No flame spread; charring does not reach top reference point | ZR / ZC flame-retardant property |
| Type test | Bunched flame-spread test, class C | GB/T 18380.35 | Char extent ≤ 2.5 m above burner bottom edge; flame application 20 min; non-metallic volume ≥ 1.5 L/m | Class ZC per GB/T 19666 |
| Type test | Bending test (mechanical) | GB/T 12706.1 | Bend around specified mandrel without insulation/sheath damage | Mandrel diameter related to cable OD (multi-core) |
| Post-installation | DC withstand test after installation | Q/GDW 13244.1-2018 (recommended practice) | 4U0 = 2.4 kV DC, 15 min, no breakdown | For new installations; verify project specification |
| Optional | Insulation resistance measurement at 20 °C | Manufacturer test method | ≥ 36.7 MΩ·km (typical finished-cable value) | Not a routine item in GB/T 12706.1; confirm with factory |
| Optional | XLPE volume resistivity at 20 °C | Manufacturer / material test | ≥ 1 × 10¹² Ω·cm | Material-level reference |
6. Fire Behaviour. Passes GB/T 18380.12 single burn and class-C bunched burn GB/T 18380.35 (char ≤ 2.5 m) → ZC per GB/T 19666. PVC is halogen-containing — select WDZ-YJY for zero-halogen projects.
| Technical Datasheet — Flame-Retardant (FR) Characteristics | ||
| ZR-YJV 0.6/1 kV 4 × 25 mm² (Cu / XLPE / FR-PVC) | ||
| 1. Cable Identification | ||
| Code / Item | Meaning / Value | Standard / Note |
| ZR | Flame Retardant (legacy prefix); under GB/T 19666-2019 defaults to Class C; modern equivalent = ZC | GB/T 19666-2019 |
| YJ | XLPE — cross-linked polyethylene insulation | — |
| V | PVC outer sheath — flame-retardant grade, contains halogen (Cl) | GB/T 19666-2019 |
| 0.6/1 kV | Rated voltage U₀/U = 600/1000 V; maximum Uₘ = 1.2 kV | IEC 60502-1 |
| 4 × 25 mm² | Four cores, nominal copper conductor area 25 mm² per core (all cores equal) | — |
| Construction | Unarmoured, non-screened, round multi-core | — |
| Application note | Four-core → three-phase AC with neutral (L1+L2+L3+N) or with PE (L1+L2+L3+PE), equal conductor sizes | — |
| 2. Flame-Retardant & Fire Performance (CORE) | ||
| Property | Value / Requirement | Standard |
| Flame Retardant Class | Class C (bundled cables, char length ≤ 2.5 m) | GB/T 19666-2019; GB/T 18380.3 / IEC 60332-3-24 |
| Legacy designation | ZR (= ZC); modern prefix preferred: ZC | GB/T 19666-2019 |
| Test method — flame | Bunched flame test (category C), char ≤ 2.5 m after flame removal | GB/T 18380.3 (IEC 60332-3-24) |
| Halogen content | Contains halogen — Cl from PVC sheath; releases HCl on burning | GB/T 17650 / IEC 60754-1/-2 |
| Smoke density | Heavy dark smoke — NOT low-smoke (no LSZH certification) | GB/T 17651 / IEC 61034 |
| Corrosivity | Corrosive — HCl gas generated during fire | GB/T 17650 / IEC 60754-2 |
| pH / conductivity of gases | Not certified (PVC base — acidic / conductive combustion gases) | GB/T 17650 / IEC 60754-2 |
| Limited Oxygen Index (LOI) | PVC typical ≈ 45–49 % O₂ (reference, design value) | ASTM D2863 / GB/T 2406, reference |
| Max. conductor operating temp. | 90 °C (long-term service) | GB/T 12706.1-2020 |
| Max. short-circuit temp. (≤5 s) | 250 °C | IEC 60502-1 |
| Emergency overload temp. | 105 °C (up to 130 °C transient) | IEC 60502-1 |
| Service ambient range (PVC sheath) | −15 °C to +90 °C | — |
| Min. installation ambient temp. | 0 °C (pre-heat required below 0 °C) | — |
| 3. Fire Test Summary | ||
| Test | Requirement | ZR-YJV 4×25 Verdict |
| Bunched flame test (Class C) | Char length ≤ 2.5 m | PASS (design, Class C) |
| Single flame test (IEC 60332-1) | Self-extinguishing | PASS (XLPE/PVC FR) |
| Smoke density (IEC 61034) | Light transmittance ≥ 60 % for LSZH | N/A (PVC = heavy smoke) |
| Halogen content (IEC 60754) | ≤ 0.5 % HCl for LSZH | N/A (contains Cl) |
| Acidity / corrosivity (IEC 60754-2) | pH ≥ 4.3; conductivity ≤ 10 µS/mm for LSZH | N/A (corrosive HCl) |
| Fire-survival (BS 6387 / IEC 60331) | Circuit integrity during/after fire | N/A — use NH-ZR-YJV |
| 4. Key Electrical & Thermal Parameters | ||
| Parameter | Value | Note |
| Rated voltage U₀/U | 0.6 / 1 kV | Uₘ = 1.2 kV |
| Test voltage AC (5 min, routine) | 3.5 kV | IEC 60502-1 |
| Type-test voltage | 4.0 kV | IEC 60502-1 |
| DC resistance @ 20 °C (per core) | ≤ 0.749 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.973 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 75–85 A (design ≈ 80 A) | 4-core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 92–105 A (design ≈ 98 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 2.50 kA | reference |
| Frequency | 50/60 Hz AC | — |
| 5. Construction & Material Specification | ||
| Layer (inside → out) | Description / Specification | FR Contribution |
| Conductor (×4) | Bare annealed copper, Class 2 stranded, 7×∅2.14 mm, conductor Ø ≈ 6.4 mm | None (Cu non-combustible) |
| Conductor screen | Omitted (not required for 0.6/1 kV) | — |
| Insulation (×4) | XLPE, colours: brown/black/grey/blue etc., 0.9 mm nominal | XLPE — low flame spread |
| Filler | Flame-retardant PP / PE to form round assembly | FR additive |
| Binder | Flame-retardant tape over laid-up cores | FR barrier |
| Outer sheath | Flame-retardant PVC (ZR grade), 1.8 mm nominal, black | Primary FR layer (halogenated) |
| Armour | None | — |
| Metallic screen | None | — |
| 6. Dimensional Data | ||
| Item | Typical Value | Remarks |
| Conductor nominal area (per core) | 25 mm² | — |
| Number of cores | 4 | — |
| Conductor construction | Class 2, 7×∅2.14 mm | min. 7 wires |
| Conductor diameter (approx.) | 6.4 mm | — |
| Insulation thickness | 0.9 mm | 25 mm² class |
| Diameter over insulated core | 8.2 mm | 6.4 + 2×0.9 |
| Sheath thickness | 1.8 mm | multi-core rule, ≥ 1.8 mm |
| Overall cable diameter | 20.5 – 22.0 mm (use 21.2 mm for design) | — |
| Approx. weight | 620 – 700 kg/km (use ≈ 660 kg/km) | — |
| Cable shape | Round | — |
| 7. Mechanical & Installation Parameters | ||
| Parameter | Value | Note |
| Minimum bending radius (unarmoured multi-core) | ≥ 15 × OD ≈ 318 mm @ Ø21.2 mm | — |
| Max. pulling tension (Cu only) | 50 N/mm² × 25 mm² × 4 = 5,000 N total | use conductor sock, avoid sheath grip |
| Direct burial | Allowed in non-aggressive soil; for mechanical protection use ZR-YJV22 4×25 | — |
| Conduit ID | ≥ 1.5 × OD → ≥ 32 mm (use 40 mm conduit) | — |
| Elevation difference limit | None (XLPE) | — |
| 8. Selection Guide — When FR Matters | ||
| Scenario | Recommended Cable | Reason |
| Flame-retardant, halogenated acceptable (standard) | ZR-YJV 4×25 (this cable) | Class C FR, PVC sheath, cost-effective |
| Low-smoke halogen-free required (LSZH) | WDZ-YJY 4×25 | LSZH sheath — IEC 61034 / IEC 60754 compliant |
| Fire-survival circuit (circuit integrity) | NH-ZR-YJV 4×25 | BS 6387 / IEC 60331 fire-survival grade |
| Heavy mechanical load / direct burial risk | ZR-YJV22 4×25 | Steel-tape armoured version |
| Separate PE and N required | 5-core version | 4×25 has combined/shared PE-N only |
7. Verification. Routine: resistance, 3.5 kV/5 min, construction check (ins. ≥ 0.9 mm, sheath ≥ 1.8 mm). Sample: XLPE hot-set (200 ± 3 °C / 15 min / 0.2 MPa). Type: flame + bending. Site: DC 4U0 = 2.4 kV / 15 min (Q/GDW 13244.1-2018).
| Insulation Test Data | ||
| ZR-YJV 0.6/1 kV 4 × 25 mm² (Cu / XLPE / FR-PVC) | ||
| 1. Cable Identification | ||
| Item | Description | Standard / Note |
| Designation | ZR-YJV 0.6/1 kV 4×25 mm² | GB/T 12706.1-2020 |
| Conductor | Bare annealed copper, Class 2 stranded, 7×∅2.14 mm | GB/T 3956 / IEC 60228 |
| Insulation | XLPE (cross-linked polyethylene), 0.9 mm nominal | GB/T 12706.1-2020 |
| Outer sheath | Flame-retardant PVC (ZR grade), 1.8 mm nominal, black | GB/T 19666-2019 |
| Rated voltage U₀/U | 0.6 / 1 kV (Uₘ = 1.2 kV) | IEC 60502-1 |
| Number of cores | 4 (three-phase L1+L2+L3+N or L1+L2+L3+PE, equal sizes) | — |
| 2. Insulation Design Data (CORE) | ||
| Parameter | Value | Remarks |
| Insulation material | XLPE (cross-linked polyethylene) | — |
| Nominal thickness (eₙ) | 0.9 mm | 25 mm² class |
| Minimum allowable thickness (e_min) | 0.71 mm | eₙ − 0.19 mm (GB/T 12706.1-2020, Table 3) |
| Insulator colours | Brown/black/grey/blue or red/yellow/blue/green-yellow (or as specified) | IEC 60446 |
| Volume resistivity @ 90 °C | ≥ 10¹² Ω·cm | — |
| Dielectric loss factor (tan δ) @ 20 °C | ≤ 1 × 10⁻³ | reference |
| Relative permittivity (εᵣ) | ≈ 2.3 – 2.5 | reference |
| Long-term service temp. | 90 °C | GB/T 12706.1-2020 |
| Short-circuit temp. (≤ 5 s) | 250 °C | IEC 60502-1 |
| Emergency overload temp. | 105 – 130 °C | transient |
| Diameter over insulated core | 8.2 mm | conductor 6.4 + 2×0.9 |
| 3. Thermal Characteristics | ||
| Property | Value | Remarks |
| Max. conductor operating temp. (normal) | 90 °C | long-term |
| Max. conductor temp. — short-circuit (≤ 5 s) | 250 °C | IEC 60502-1 |
| Emergency overload temp. | 105 °C (up to 130 °C transient) | — |
| Min. installation ambient temp. | 0 °C (pre-heat below 0 °C) | — |
| Service ambient range (PVC sheath) | −15 °C to +90 °C | — |
| Flame retardant class (sheath) | Class C (ZR per GB/T 19666) | — |
| 4. Insulation Test Schedule | ||
| Test Item | Test Value / Condition | Result |
| Routine withstand test (AC) | 3.5 kV AC, 5 min — no breakdown | PASS |
| Type test voltage | 4.0 kV AC | PASS (IEC 60502-1) |
| Partial discharge test | ≤ 10 pC @ 1.73 U₀ (1.73 kV) | PASS (XLPE) |
| Insulation resistance (IR) | ≥ 10⁴ MΩ·km @ 20 °C (reference) | PASS |
| Hot-set test (XLPE cross-linking) | 200 °C, 15 min, load 0.2 N/mm² — elongation ≤ 175 %, permanent set ≤ 15 % | PASS (IEC 60811-507) |
| Aging test (air oven) | 135 °C, 168 h — tensile strength / elongation retained ≥ 80 % | PASS |
| Tensile strength (insulation) | ≥ 12.5 MPa (XLPE, before aging) | PASS |
| Elongation at break (insulation) | ≥ 200 % (XLPE, before aging) | PASS |
| Cold bend test | −15 °C, 4 h — no cracking | PASS |
| Water absorption | ≤ 1 mg/cm² (85 °C, 336 h, reference) | PASS |
| Breakdown voltage (insulation) | ≥ 20 kV/mm (reference) | PASS |
| DC resistance of conductor @ 20 °C | ≤ 0.749 Ω/km (Class 2 Cu, per core) | PASS (GB/T 3956) |
| Dielectric loss (tan δ) measurement | ≤ 1 × 10⁻³ @ 20 °C | PASS (reference) |
| Spark test (during production) | 6 – 10 kV (online), pinhole detection | PASS |
| Thickness measurement (microscopic) | eₙ = 0.9 mm; e_min ≥ 0.71 mm | PASS |
| 5. Electrical Parameters | ||
| Parameter | Value | Note |
| Rated voltage U₀/U | 0.6 / 1 kV | Uₘ = 1.2 kV |
| Test voltage AC (5 min, routine) | 3.5 kV | IEC 60502-1 |
| Type-test voltage | 4.0 kV | IEC 60502-1 |
| DC resistance @ 20 °C (per core) | ≤ 0.749 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.973 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 75–85 A (design ≈ 80 A) | 4-core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 92–105 A (design ≈ 98 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 2.50 kA | reference |
| Frequency | 50/60 Hz AC | — |
| 6. Dimensional / Inspection Result | ||
| Item | Design / Limit | Measured (example) |
| Conductor construction | Class 2, 7×∅2.14 mm | 7×2.14 mm |
| Conductor diameter | ≈ 6.4 mm | 6.3 mm |
| Insulation thickness (each core) | 0.9 mm (min. 0.71 mm) | 0.92 / 0.90 / 0.91 / 0.88 mm |
| Diameter over insulated core | 8.2 mm | 8.1 mm |
| Sheath thickness | 1.8 mm (min. 1.5 mm) | 1.82 mm |
| Overall cable diameter | 20.5 – 22.0 mm (design 21.2) | 21.1 mm |
| DC resistance @ 20 °C (per core) | ≤ 0.749 Ω/km | 0.738 Ω/km |
| Approx. weight | 620 – 700 kg/km (≈ 660) | 658 kg/km |
| Footnotes | ||
| 1. All tests performed at ambient 20 ± 5 °C and 45–75 % RH unless otherwise stated. | ||
| 2. Routine tests: withstand (3.5 kV / 5 min), conductor resistance, dimensional check. Type tests: 4.0 kV, partial discharge, hot-set, aging, mechanical (per IEC 60502-1). | ||
| 3. Test values marked “reference” are typical design values — confirm against manufacturer test report / GB/T 12706.1-2020. | ||
| 4. Insulation thickness for 25 mm² class = 0.9 mm nominal (GB/T 12706.1-2020, Table 3); minimum = 0.9 − 0.19 = 0.71 mm. | ||
| 5. For low-smoke halogen-free → use WDZ-YJY 4×25; for fire-survival → NH-ZR-YJV 4×25; for armoured → ZR-YJV22 4×25. | ||
8.Cross Section Structure
| ZR-YJV 4×25 mm² — Cable Cross-Section Structure (Schematic) | |||||
| Four-core construction from conductor to outer sheath · nominal values per GB/T 12706.1 / IEC 60502-1 · not to exact scale | |||||
| No. | Layer | Material / Construction | Nominal Thickness (mm) | Diameter (mm) | Function / Remarks |
| 1 | Conductor (Cu) × 4 | Annealed copper, Class 2 stranded — 7 × 2.14 mm per core (7/2.14), nominal 25 mm² per core | — | ≈ 6.40 (Ø per core) | Current-carrying element; max DC resistance ≤ 0.727 Ω/km @ 20 °C (per core) |
| 2 | Insulation (XLPE) × 4 | Cross-linked polyethylene | 0.9 | ≈ 8.20 (Ø per core, over insulation) | Dielectric barrier; rated 90 °C continuous; withstands 3.5 kV / 5 min |
| 3 | Core lay-up | Four insulated cores laid up around central non-hygroscopic filler; binder tape | — | ≈ 19.8 (Ø over lay-up) | Forms a round assembly for sheathing |
| 4 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 1.8 | ≈ 24.3 (Ø overall) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | ≈ 24.3 | mm | Mingda four-core unarmored table | ||
| Approx. cable weight | ≈ 1222 | kg/km | Mingda 1222 (Al ≈ 577.6) | ||
| Rated voltage | 0.6/1 | kV | AC 50 Hz; max system voltage Um = 1.2 kV | ||
| Max conductor temperature | 90 / 250 | °C | Continuous / short-circuit (≤ 5 s) | ||
| Min. bending radius (multi-core) | ≥ 15 × OD | — | OD = actual cable diameter | ||
| Flame-retardant class | ZC (ZR) | — | GB/T 19666 | ||
| Schematic — not to exact scale. Nominal values for reference; confirm against factory test certificate. | |||||
| Product Structure Introduction — ZR-YJV 4×25 mm² | |||
| Four-core layered construction description, from conductor to outer sheath · per GB/T 12706.1 & IEC 60502-1 · CU / XLPE / PVC · 0.6/1 kV | |||
| 1. Product Role | |||
| ZR-YJV 4×25 is a flame-retardant four-core power cable rated 0.6/1 kV AC, from the copper / XLPE / PVC product family. It is made to GB/T 12706.1 / IEC 60502-1, with conductors per GB/T 3956 / IEC 60228 and the flame class per GB/T 19666 (ZC default). Approx. outside diameter 24.3 mm, weight ≈ 1222 kg/km, supplied on 100 m coils or drums. | |||
| Four equal 25 mm² cores suit three-phase-plus-neutral circuits, typically balanced so the neutral carries only imbalance current. | |||
| 2. Conductor Build-Up | |||
| Each 25 mm² core is stranded from seven 2.14 mm annealed copper wires — 7/2.14 Class 2 — to ≈ 6.40 mm diameter. Maximum DC resistance per core is 0.727 Ω/km at 20 °C. The heavier section still bends acceptably for risers and trunking because of the round stranded construction. | |||
| 3. Insulation Build-Up | |||
| Insulation thickness steps up to 0.9 mm at this size; each core is covered and the diameter over insulation reaches ≈ 8.20 mm. XLPE gives 90 °C continuous service, 250 °C for five seconds under short-circuit, volume resistivity of at least 1×10¹² Ω·cm, and passes a routine 3.5 kV AC, five-minute withstand. | |||
| 4. Assembly & Sheathing | |||
| The four insulated cores are twisted around a central dry filler into a round bundle of ≈ 19.8 mm, held by binder tape. A 1.8 mm flame-retarded PVC (ST2) jacket is extruded over the bundle to close at ≈ 24.3 mm. ZC fire performance is confirmed by GB/T 18380.12 and GB/T 18380.35; as the PVC carries halogen, WDZ-YJY is the right selection for zero-halogen projects. | |||
| 5. Practical Notes | |||
| • Keep bends ≥ 15 × OD. • Carry out the DC 4U0 = 2.4 kV / 15 min site test before energising. • Service ambient −20 to +45 °C; warm reels when pulling below 0 °C. • Apply ambient, grouping and burial derating — ratings are whole-cable values. • Use lugs and glands sized for the ≈ 6.40 mm core. |
9. Usage Cautions. Bend ≥ 15 × OD; pull by stocking; avoid kinking; protect from UV/impact; run the DC site test before energising; balance L1–L3 loads; size lugs for the ≈ 6.40 mm core.
10. Application Range. Three-phase + neutral feeders and sub-distribution at 0.6/1 kV — building mains, distribution boards, HVAC/pump circuits — in conduit, trays, trenches, ducts, trunking; indoor or sheltered outdoor.
11. Ordering Information. ZR-YJV 0.6/1 kV 4×25, length and drum type, marking. Standard 100 m; confirm all figures against the factory test certificate.
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