3x25mm2+1x16mm2 25 Sq Mm 4 Core Cable For Three Phase Retrofit Projects
3x25mm2+1x16mm2 25 Sq Mm 4 Core Cable For Three Phase Retrofit Projects
Product Summary
Flame Retardant 3+1 Core Copper Cable ZR-YJV 3x25mm²+1x16mm² for Three Phase Retrofit Projects Cable Designation & Meaning Code Meaning ZR Legacy prefix for flame retardant; under GB/T 19666-2019 it defaults to Class C (modern equivalent: ZC). YJ XLPE (cross-linked polyethylene) insulation V PVC ...
Product Details
Highlight:
Retrofit Projects xlpe cu cable
,25 sq mm 4 Core Cable ISO
,0.9mm 150 sq mm 4 core cable
Phase conductor (×3):
Bare Annealed Copper, Class 2 Stranded, 7×∅2.14 Mm, Conductor Ø ≈ 6.4–6.8 Mm
Neutral conductor (×1):
Bare Annealed Copper, Class 2 Stranded, 7×∅1.70 Mm, Conductor Ø ≈ 5.1–5.5 Mm
Phase conductor nominal area:
25 Mm²
Neutral conductor nominal area:
16 Mm²
Number of cores:
4 (3+1)
Phase conductor construction:
Class 2, 7×∅2.14 Mm,IEC 60228 / GB/T 3956
Neutral conductor construction:
Class 2, 7×∅1.70 Mm,IEC 60228 / GB/T 3956
Phase conductor diameter (approx.):
6.4–6.8 Mm
Neutral conductor diameter (approx.):
5.1–5.5 Mm
Insulation (×4):
XLPE
Phase insulation thickness:
0.9 Mm (25 Mm² Class)
Neutral insulation thickness:
0.7 Mm (16 Mm² Class)
Diameter over phase insulated core:
8.2–8.6 Mm
Diameter over neutral insulated core:
6.5–6.9 Mm
Filler / binder:
FR PP Filler + FR Tape
Outer sheath:
Flame-retardant PVC (ZR Grade)
Sheath thickness:
1.5 Mm (GB/T 12706 Multi-core 16–35 Mm² Range)
Overall cable diameter:
16.5 – 20.0 Mm
Design outer diameter:
≈ 18.0 Mm
Approx. weight:
430 – 560 Kg/km
Design weight:
≈ 480 Kg/km
Product Description
Flame Retardant 3+1 Core Copper Cable ZR-YJV 3x25mm²+1x16mm² for Three Phase Retrofit Projects
Cable Designation & Meaning
|
Code |
Meaning |
|---|---|
|
ZR |
Legacy prefix for flame retardant; under GB/T 19666-2019 it defaults to Class C (modern equivalent: ZC). |
|
YJ |
XLPE (cross-linked polyethylene) insulation |
|
V |
PVC outer sheath — flame-retardant grade, contains halogen (Cl) |
|
0.6/1 kV |
Rated voltage U₀/U = 600/1000 V; Uₘ = 1.2 kV |
|
3×25+1×16 mm² |
Three phase cores of 25 mm² copper + one reduced neutral core of 16 mm² copper |
ZR-YJV 3×25+1×16 mm² — Cable Specification & Engineering Data
1. Overview & Ratings. ZR-YJV 3×25+1×16 — flame-retarding 3+1-core cable, three 25 mm² Cu phase conductors + one 16 mm² Cu neutral conductor, XLPE insulation, one ST2 PVC sheath, rated 0.6/1 kV (Um = 1.2 kV), 50 Hz; built and proof-tested per GB/T 12706.1 / IEC 60502-1, stranding per GB/T 3956, ZC fire class per GB/T 19666. ≈ 21.8 mm, ≈ 1065 kg/km, 100 m coils/drums.
2. Construction Stack. Conductor → outer sheath:
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor — phase (×3) | Annealed Cu, Class 2, 7 × 2.14 mm (1+6) each | — | ≈ 6.42 mm |
| Conductor — neutral (×1) | Annealed Cu, Class 2, 7 × 1.70 mm (1+6) | — | ≈ 5.10 mm |
| Insulation — phase (×3) | XLPE | 0.9 mm | ≈ 8.22 mm |
| Insulation — neutral (×1) | XLPE | 0.7 mm | ≈ 6.50 mm |
| Lay-up | Neutral core at centre + 3 phase cores around + filler + binder tape | — | ≈ 17.8 mm (calc.) |
| Sheath | Flame-retarded PVC, ST2, black | 2.0 mm | ≈ 21.8 mm (Zhongce 3+1) |
3. Electrical Ratings. R ≤ 0.727 Ω/km (phase) / 1.15 Ω/km (neutral) @ 20 °C; routine 3.5 kV / 5 min; insulation resistance ≥ 36.7 MΩ·km; XLPE volume resistivity ≥ 1×10¹² Ω·cm; capacitance ≤ 0.45 μF/km. Reference ampacity (3 phase cores loaded) ≈ 130 A air @ 30 °C / 150 A buried @ 25 °C — Zhongce 3+1 unarmored table.
|
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 60502-1 |
|
DC resistance @20 °C (phase, per core) |
≤ 0.727 Ω/km |
GB/T 3956 max, 25 mm² |
|
DC resistance @20 °C (neutral, per core) |
≤ 1.15 Ω/km |
GB/T 3956 max, 16 mm² |
|
AC resistance @90 °C (est., phase) |
≈ 0.946 Ω/km |
per core |
|
AC resistance @90 °C (est., neutral) |
≈ 1.50 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 3-core+1) |
≈ 88–100 A |
based on 25 mm² phase |
|
Current rating in air (design) |
≈ 93 A |
apply grouping + ambient correction |
|
Direct buried (20–25 °C, soil 1.0–1.2 K·m/W, 0.7 m) |
≈ 100–115 A |
common catalogue 105–110 A |
|
Design buried rating |
≈ 107 A |
soil thermal resistivity correction required |
|
Short-circuit current (1 s, Cu, 250 °C, phase) |
≈ 2.5 kA |
25 mm² reference |
|
Short-circuit current (1 s, Cu, 250 °C, neutral) |
≈ 1.6 kA |
16 mm² reference |
|
Frequency |
50/60 Hz AC |
— |
4.Cable Parameters & Test Parameters
| ZR-YJV 3×25+1×16 mm² — Test / Verification Parameters (per GB/T 12706.1 & IEC 60502-1) | ||||
| Stage | Test Item | Method / Standard | Acceptance Criterion | Notes |
| Routine | Conductor DC resistance — phase | GB/T 3956 (IEC 60228) | ≤ 0.727 Ω/km @ 20 °C (25 mm²) | Every production length |
| Routine | Conductor DC resistance — neutral | GB/T 3956 (IEC 60228) | ≤ 1.15 Ω/km @ 20 °C (16 mm²) | Every production length |
| Routine | Power-frequency withstand voltage | GB/T 12706.1 / IEC 60502-1 | 3.5 kV AC / 5 min, no breakdown | Conductor-to-earth/water |
| Routine | Construction check | GB/T 2951 | Phase ins. ≥ 0.9 mm; neutral ins. ≥ 0.7 mm; sheath ≥ 2.0 mm; OD within tolerance | Thickness & diameter |
| Sample | Hot set test — XLPE | GB/T 12706.1 §16.3.13 / GB/T 2951.11 | 200 ± 3 °C, 15 min, 0.2 MPa: load elongation ≤ 175 %; permanent ≤ 15 % | Cross-linking degree |
| Sample | Conductor construction & diameter | GB/T 3956 | Phase: 7 × 2.14 mm Ø ≈ 6.42; neutral: 7 × 1.70 mm Ø ≈ 5.10 | Per batch |
| Type | Single-cable flame test | GB/T 18380.12 | No flame spread to top reference | ZR property |
| Type | Bunched flame test — class C | GB/T 18380.35 | Char ≤ 2.5 m; 20 min; ≥ 1.5 L/m | ZC class |
| Type | Bending test | GB/T 12706.1 | No damage on specified mandrel | Multi-core rule |
| Post-install | DC withstand test | Q/GDW 13244.1-2018 | 2.4 kV DC / 15 min, no breakdown | New installations |
| Optional | Insulation resistance @ 20 °C | Factory method | ≥ 36.7 MΩ·km | Not routine in GB/T 12706.1 |
5.Cable Cross Section Strcuture
| ZR-YJV 3×25+1×16 mm² — Cable Cross-Section Structure (Schematic) | |||||
| 3+1 core construction (3 phase + 1 neutral) 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 — phase (Cu) × 3 | Annealed copper, Class 2 stranded — 7 × 2.14 mm per core (7/2.14, 1+6), nominal 25 mm² per core | — | ≈ 6.42 (Ø per phase core) | Current-carrying phase conductors; max DC resistance ≤ 0.727 Ω/km @ 20 °C |
| 2 | Conductor — neutral (Cu) × 1 | Annealed copper, Class 2 stranded — 7 × 1.70 mm (7/1.70, 1+6), nominal 16 mm² | — | ≈ 5.10 (Ø neutral core) | Neutral / return conductor; max DC resistance ≤ 1.15 Ω/km @ 20 °C |
| 3 | Insulation — phase (XLPE) × 3 | Cross-linked polyethylene | 0.9 | ≈ 8.22 (Ø per phase core, over insulation) | Dielectric barrier; rated 90 °C continuous; withstands 3.5 kV / 5 min |
| 4 | Insulation — neutral (XLPE) × 1 | Cross-linked polyethylene | 0.7 | ≈ 6.50 (Ø neutral core, over insulation) | Dielectric barrier for neutral core |
| 5 | Core lay-up | Neutral core at centre + three phase cores around it + dry filler + binder tape | — | ≈ 17.8 (Ø over lay-up, calc.) | 3+1 configuration; round bundle |
| 6 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 2 | ≈ 21.8 (Ø overall, Zhongce) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | ≈ 21.8 | mm | Zhongce 3+1 unarmored table | ||
| Approx. cable weight | ≈ 1065 | kg/km | Zhongce 1065 (Cu) | ||
| 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. | |||||
6. Thermal & Fire. 90 °C continuous, 250 °C short-circuit (≤ 5 s); −20~+45 °C ambient, ≥ 0 °C laying; ZC per GB/T 19666 — GB/T 18380.12 single-burn + GB/T 18380.35 class-C bunched (char ≤ 2.5 m); PVC is halogen-bearing → WDZ-YJY for LSZH.
| Flame-Retardant (FR) Characteristics — ZR-YJV 3×25+1×16 mm² | ||
| ZR-YJV 3×25+1×16 mm² (3 (L1+L2+L3, 25 mm²) + 1 (N, 16 mm²); 3+1 = L1+L2+L3+N) · 0.6/1 kV | ||
| 1. Cable Identification | ||
| Code / Item | Meaning / Value | Standard / Note |
| Designation | ZR-YJV 3×25+1×16 mm² | GB/T 12706.1-2020 |
| ZR | Flame Retardant (legacy); under GB/T 19666-2019 defaults to Class C; modern = ZC | GB/T 19666-2019 |
| YJ | XLPE insulation (cross-linked polyethylene) | — |
| V | PVC outer sheath — flame-retardant, contains halogen (Cl) | GB/T 19666-2019 |
| 0.6/1 kV | U₀/U = 600/1000 V; Uₘ = 1.2 kV | IEC 60502-1 |
| 3×25+1×16 mm² | Three 25 mm² phase cores + one 16 mm² neutral core (reduced neutral, 3+1 construction) | — |
| Construction | Unarmoured, non-screened, round multi-core (3+1) | — |
| Application note | 3+1 core → three-phase AC with neutral (L1+L2+L3+N); neutral reduced to 16 mm². No separate PE (use 4-core or 5-core if PE required). | — |
| 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 3×25+1×16 mm² 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 (phase, 25 mm²) | ≤ 0.740 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| DC resistance @ 20 °C (neutral, 16 mm²) | ≤ 1.15 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (phase, est.) | ≈ 0.962 Ω/km | per phase core |
| Current rating — in air (30 °C, single circuit) | ≈ 95–105 A (design ≈ 100 A) | 3+1 core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 115–130 A (design ≈ 122 A) | 3+1 core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 2.5 kA (per phase core) | phase core; neutral ≈ 1.6 kA |
| 5. Construction & Material Specification (with FR Contribution) | ||
| Layer (inside → out) | Description / Specification | FR Contribution |
| Conductor (phase ×3) | Bare annealed copper, Class 2 stranded, 7×Ø2.14 mm, Ø ≈ 6.70 mm | None (Cu non-combustible) |
| Conductor (neutral ×1) | Bare annealed copper, Class 2 stranded, 7×Ø1.70 mm, Ø ≈ 5.20 mm | None (Cu non-combustible) |
| Conductor screen | Omitted (not required for 0.6/1 kV) | — |
| Insulation (×4) | XLPE (cross-linked polyethylene), phase 0.9 mm (e_min 0.71) / neutral 0.7 mm (e_min 0.54); L1/L2/L3 = brown/black/grey, N = blue | 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 |
| Inner binder / assembly | FR tape, no inner sheath required for plain YJV | FR barrier |
| Outer sheath | Flame-retardant PVC (ZR grade), 1.5 mm (multi-core, 3+1 rule), Black (standard) | Primary FR layer (halogenated) |
| Armour | None | — |
| Metallic screen | None | — |
| 6. Dimensional Data | ||
| Item | Typical Value | Remarks |
| Conductor nominal area | 3×25 mm² + 1×16 mm² | phase / neutral |
| Number of cores | 4 (3+1) | — |
| Conductor construction | Phase: Class 2, 7×Ø2.14 mm; Neutral: Class 2, 7×Ø1.70 mm | min. 7 wires |
| Conductor diameter (approx.) | Phase ≈ 6.70 mm; Neutral ≈ 5.20 mm | — |
| Insulation thickness | Phase 0.9 mm; Neutral 0.7 mm (25 / 16 mm² classes) | 0.9 / 0.7 mm class |
| Diameter over insulated core | Phase 8.5 mm; Neutral 6.6 mm | conductor + 2×insulation |
| Sheath thickness | 1.5 mm (multi-core, 3+1 rule) | 3+1 multi-core rule |
| Overall cable diameter | 16.0 – 19.5 mm (design ≈ 18.0 mm) | design ≈ 18.0 mm |
| Approx. weight | 460 – 600 kg/km (use ≈ 560 kg/km) | — |
| Cable shape | Round | — |
| 7. Mechanical & Installation Parameters | ||
| Parameter | Value | Note |
| Minimum bending radius (unarmoured multi-core) | ≥ 15 × OD ≈ 270 mm @ Ø≈ 18.0 mm | — |
| Max. pulling tension (Cu only) | 50 N/mm² × (3×25 + 1×16) = 4,550 N total | use conductor sock, avoid sheath grip |
| Direct burial | Allowed in non-aggressive soil; for mechanical protection use ZR-YJV22 3×25+1×16 | — |
| Conduit ID | ≥ 1.5 × OD → ≥ 27 mm (use 32 mm or 40 mm conduit) | — |
| Fixing (horizontal / vertical tray) | ≈ 800 mm / ≈ 1500 mm (horizontal / vertical tray) | — |
| Elevation difference limit | None (XLPE) | — |
| 8. Selection Guide — When FR Matters | ||
| Scenario | Recommended Cable | Reason |
| Flame-retardant, halogenated acceptable (standard) | ZR-YJV 3×25+1×16 mm² (this cable) | Class C FR, PVC sheath, cost-effective |
| Low-smoke halogen-free required (LSZH) | WDZ-YJY 3×25+1×16 | LSZH sheath — IEC 61034 / IEC 60754 compliant |
| Fire-survival circuit (circuit integrity) | NH-ZR-YJV / WDZN-YJY 3×25+1×16 | BS 6387 / IEC 60331 fire-survival grade |
| 1. ZR is the legacy GB/T 19666-2019 Class C designation; modern equivalent is ZC. Class C: char ≤ 2.5 m after bunched flame test (GB/T 18380.3). | ||
| 2. PVC sheath is halogenated (contains Cl, releases HCl) → heavy smoke and corrosive gases; NOT suitable for LSZH-required routes (use WDZ-YJY). | ||
| 3. 3×25+1×16 mm² = three 25 mm² phase cores (L1+L2+L3) + one 16 mm² neutral (N), total 4 cores (3+1); neutral is reduced in size. Current ratings (≈100 A air / ≈122 A buried) are design values; apply grouping, ambient temperature, soil thermal resistivity and IEC 60364-5-52 correction factors. | ||
| 4. For LSZH → WDZ-YJY 3×25+1×16; for fire-survival → NH-ZR-YJV / WDZN-YJY 3×25+1×16; for armour → ZR-YJV22 3×25+1×16; for separate PE → use 5-core (e.g. 5×16). | ||
| 5. DC resistance phase ≤ 0.740 Ω/km, neutral ≤ 1.15 Ω/km (GB/T 3956 Class 2 max). Test values marked “reference” are typical design values — confirm against manufacturer test report / GB/T 12706.1-2020. | ||
7. Installation & Care. Bend ≥ 15 × OD; DC site test 4U0 = 2.4 kV / 15 min before energising (Q/GDW 13244.1-2018); pre-heat drums below 0 °C; de-rate 130/150 A for ambient, grouping, burial; lugs/glands for the 6.42 mm phase core, 5.10 mm neutral core and 21.8 mm sheath.
| Insulation Test Data — ZR-YJV 3×25+1×16 mm² | ||
| ZR-YJV 3×25+1×16 mm² (Cu / XLPE / FR-PVC) · 0.6/1 kV | ||
| 1. Cable Identification | ||
| Item | Description | Standard / Note |
| Designation | ZR-YJV 3×25+1×16 mm² | GB/T 12706.1-2020 |
| Conductor | Bare annealed copper, Class 2 stranded — phase 3×7×Ø2.14 mm, neutral 1×7×Ø1.70 mm | GB/T 3956 / IEC 60228 |
| Insulation | XLPE (cross-linked polyethylene), phase 0.9 mm / neutral 0.7 mm nominal (25 / 16 mm² respectively) | GB/T 12706.1-2020 |
| Insulator colours | L1/L2/L3 = brown/black/grey (25 mm²); N = blue (16 mm²) | IEC 60446 |
| Outer sheath | Flame-retardant PVC (ZR grade), 1.5 mm (multi-core, 3+1 rule), Black (standard) | GB/T 19666-2019 |
| Rated voltage U₀/U | 0.6 / 1 kV | Uₘ = 1.2 kV |
| Number of cores | 4 (3×25 mm² phase + 1×16 mm² neutral, 3+1) | — |
| 2. Insulation Design Data (CORE) | ||
| Parameter | Value | Remarks |
| Insulation material | XLPE (cross-linked polyethylene) | — |
| Nominal thickness (eₙ) | Phase 0.9 mm (25 mm²); Neutral 0.7 mm (16 mm²) | two core sizes |
| Minimum allowable thickness (e_min) | Phase 0.71 mm; Neutral 0.54 mm | eₙ − 0.19 / eₙ − 0.16 (GB/T 12706.1-2020, Table 3) |
| Insulator colours | L1/L2/L3 = brown/black/grey (25 mm²); N = blue (16 mm²) | 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 | Phase 8.5 mm; Neutral 6.6 mm | phase 6.70 + 2×0.9 / neutral 5.20 + 2×0.7 |
| 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 | Phase ≤ 0.740 Ω/km; Neutral ≤ 1.15 Ω/km (Class 2 Cu) | 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) | Phase eₙ = 0.9 / 0.7 mm; e_min ≥ 0.71 / 0.54 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 (phase, 25 mm²) | ≤ 0.740 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| DC resistance @ 20 °C (neutral, 16 mm²) | ≤ 1.15 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (phase, est.) | ≈ 0.962 Ω/km | per phase core |
| Current rating — in air (30 °C, single circuit) | ≈ 95–105 A (design ≈ 100 A) | 3+1 core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 115–130 A (design ≈ 122 A) | 3+1 core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 2.5 kA (per phase core) | reference; neutral ≈ 1.6 kA |
| Frequency | 50/60 Hz AC | — |
| 6. Dimensional / Inspection Result | ||
| Item | Design / Limit | Measured (example) |
| Conductor construction | Phase 3×7×Ø2.14 mm; Neutral 1×7×Ø1.70 mm | 7×Ø2.14 mm / 7×Ø1.70 mm |
| Conductor diameter | Phase ≈ 6.70 mm; Neutral ≈ 5.20 mm | 6.65 / 5.15 mm |
| Insulation thickness (per core) | Phase 0.9 mm / Neutral 0.7 mm (min. 0.71 / 0.54 mm) — all 4 cores | 0.93 / 0.91 / 0.90 / 0.72 mm (L1/L2/L3/N) |
| Diameter over insulated core | Phase 8.5 mm; Neutral 6.6 mm | 8.45 / 6.55 mm |
| Sheath thickness | 1.5 mm (multi-core, 3+1 rule) (min. 1.2 mm) | 1.53 mm |
| Overall cable diameter | 16.0 – 19.5 mm (design ≈ 18.0 mm) | 17.8 mm |
| Approx. weight | 460 – 600 kg/km (use ≈ 560 kg/km) | ≈ 555 kg/km |
| DC resistance @ 20 °C | Phase ≤ 0.740 Ω/km; Neutral ≤ 1.15 Ω/km | 0.756 / 1.18 Ω/km |
| Max. pulling tension (Cu only) | 50 N/mm² × (3×25 + 1×16) = 4,550 N total | conductor sock |
| 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: phase 25 mm² = 0.9 mm (e_min = 0.9 − 0.19 = 0.71 mm); neutral 16 mm² = 0.7 mm (e_min = 0.7 − 0.16 = 0.54 mm) (GB/T 12706.1-2020, Table 3). | ||
| 5. 3×25+1×16 mm² = three 25 mm² phase cores (L1+L2+L3) + one 16 mm² neutral (N), total 4 cores (3+1); neutral is reduced. Four thickness readings (L1/L2/L3/N) are recorded at inspection. | ||
| 6. For low-smoke halogen-free → WDZ-YJY 3×25+1×16; for fire-survival → NH-ZR-YJV / WDZN-YJY 3×25+1×16; for armoured → ZR-YJV22 3×25+1×16; for separate PE → 5-core cable. | ||
8. Application. Three-phase four-wire distribution, building mains and medium industrial feeders where a dedicated neutral conductor is required in one cable (TN-C style) — conduit, tray, trench, duct, trunking; indoor or sheltered outdoor.
9. Ordering. ZR-YJV 0.6/1 kV 3×25+1×16 + length/drum + marking; confirm against factory test certificate.
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