8,2 – 8,6mm 25mm2 5 πυρήνων θωρακισμένο καλώδιο με επένδυση εύκαμπτο Για Εσωτερικά Συστήματα Διανομής Ενέργειας
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,2mm25mm 5 πυρήνων θωρακισμένο καλώδιο
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5 Core 25mm² ZR-YJV Flame Retardant Copper Cable for Indoor Power Distribution Systems
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 |
|
5×25 mm² |
Five cores, nominal copper conductor area 25 mm² per core |
ZR-YJV 5×25 mm² — Cable Specification & Engineering Data
1. Overview & Ratings. ZR-YJV 5×25 — flame-retarding five-core cable, five 25 mm² Cu conductors, 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. ≈ 26.6 mm, ≈ 1503 kg/km (Al ≈ 697.4), 100 m coils/drums.
2. Construction Stack. Conductor → outer sheath:
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor (×5) | Annealed Cu, Class 2, 7 × 2.14 mm (1+6) each | — | ≈ 6.4 mm |
| Insulation (×5) | XLPE | 1.2 mm | ≈ 8.8 mm |
| Lay-up | Five cores (pentagonal ring) + filler + binder tape | — | ≈ 23.0 mm (calc.) |
| Sheath | Flame-retarded PVC, ST2, black | 1.8 mm | ≈ 26.6 mm (Mingda five-core) |
3. Electrical Ratings. R ≤ 0.727 Ω/km @ 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 (five cores loaded) ≈ 105 A air / 125 A buried @ 25 °C — Mingda five-core 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 (Class 2 Cu, per core) |
≤ 0.727 Ω/km |
GB/T 3956 max |
|
AC resistance @90 °C (est.) |
≈ 0.946 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 5-core) |
≈ 80–92 A |
common catalogue value |
|
Current rating in air (design) |
≈ 85 A |
apply grouping + ambient correction |
|
Direct buried (20–25 °C, soil 1.0–1.2 K·m/W, 0.7 m) |
≈ 92–105 A |
common catalogue 95–102 A |
|
Design buried rating |
≈ 98 A |
soil thermal resistivity correction required |
|
Short-circuit current (1 s, Cu, 250 °C, per core) |
≈ 2.5 kA |
reference |
|
Frequency |
50/60 Hz AC |
— |
4.Cable Parameters and Test Parameters
| ZR-YJV 5×25 mm² — Test / Verification Parameters (per GB/T 12706.1 & IEC 60502-1) | ||||
| Stage | Test Item | Method / Standard | Acceptance Criterion | Notes |
| Routine | Conductor DC resistance | GB/T 3956 (IEC 60228) | ≤ 0.727 Ω/km @ 20 °C (per core) | 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 | Ins. ≥ 1.2 mm; sheath ≥ 1.8 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 | Class 2; 7 × 2.14 mm; Ø ≈ 6.4 mm | 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 |
| Optional | XLPE volume resistivity | Material test | ≥ 1 × 10¹² Ω·cm | Material reference |
5. 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.
6. 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 105/125 A for ambient, grouping, burial; lugs/glands for the 6.4 mm core and 26.6 mm sheath.
| Insulation Test Data — ZR-YJV 5×25 mm² | ||
| ZR-YJV 5×25 mm² (Cu / XLPE / FR-PVC) · 0.6/1 kV | ||
| 1. Cable Identification | ||
| Item | Description | Standard / Note |
| Designation | ZR-YJV 5×25 mm² | GB/T 12706.1-2020 |
| Conductor | Bare annealed copper, Class 2 stranded, 7×Ø2.14 mm | GB/T 3956 / IEC 60228 |
| Insulation | XLPE (cross-linked polyethylene), 0.7 mm nominal | GB/T 12706.1-2020 |
| Insulator colours | L1/L2/L3 = brown/black/grey; N = blue; PE = green-yellow | IEC 60446 |
| Outer sheath | Flame-retardant PVC (ZR grade), 1.6 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 | 5 (L1+L2+L3+N+PE, equal sizes) | — |
| 2. Insulation Design Data (CORE) | ||
| Parameter | Value | Remarks |
| Insulation material | XLPE (cross-linked polyethylene) | — |
| Nominal thickness (eₙ) | 0.7 mm | 25 mm² class |
| Minimum allowable thickness (e_min) | 0.54 mm | eₙ − 0.16 mm (GB/T 12706.1-2020, Table 3) |
| Insulator colours | L1/L2/L3 = brown/black/grey; N = blue; PE = green-yellow | 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 | 7.8 mm | conductor 6.4 + 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 | ≤ 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 = 0.7 mm; e_min ≥ 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 (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) | ≈ 80–92 A (design ≈ 85 A) | 5-core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 95–108 A (design ≈ 100 A) | 5-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×Ø2.14 mm | 7×2.14 mm |
| Conductor diameter | ≈ 6.4 mm | 6.35 mm |
| Insulation thickness (each core) | 0.7 mm (min. 0.54 mm) | 0.71 / 0.69 / 0.70 / 0.72 / 0.68 mm |
| Diameter over insulated core | 7.8 mm | 7.7 mm |
| Sheath thickness | 1.6 mm (min. 1.3 mm) | 1.62 mm |
| Overall cable diameter | 16.5 – 19.5 mm (design ≈ 17.5 mm) | 17.4 mm |
| DC resistance @ 20 °C (per core) | ≤ 0.749 Ω/km | 0.741 Ω/km |
| Approx. weight | 400 – 520 kg/km (use ≈ 460 kg/km) | 458 kg/km |
| 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 = 0.7 mm nominal (GB/T 12706.1-2020, Table 3); minimum = 0.7 − 0.16 = 0.54 mm. | ||
| 5. 5×25 mm² = five equal cores (L1+L2+L3+N+PE); insulation colours per IEC 60446. Five core-thickness readings are recorded at inspection. | ||
| 6. For low-smoke halogen-free → use WDZ-YJY 5×25; for fire-survival → NH-ZR-YJV / WDZN-YJY 5×25; for armoured → ZR-YJV22 5×25. | ||
7.Cable Cross Section Structure
| ZR-YJV 5×25 mm² — Cable Cross-Section Structure (Schematic) | |||||
| Five-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) × 5 | Annealed copper, Class 2 stranded — 7 × 2.14 mm per core (7/2.14, 1+6), nominal 25 mm² per core | — | ≈ 6.4 (Ø per core) | Current-carrying element; max DC resistance ≤ 0.727 Ω/km @ 20 °C (per core) |
| 2 | Insulation (XLPE) × 5 | Cross-linked polyethylene | 1.2 | ≈ 8.8 (Ø per core, over insulation) | Dielectric barrier; rated 90 °C continuous; withstands 3.5 kV / 5 min |
| 3 | Core lay-up | Five insulated cores laid up in a pentagonal ring around dry filler; binder tape | — | ≈ 23.0 (Ø over lay-up, calc.) | Round assembly; the 5th core is the PE (earthing) core |
| 4 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 1.8 | ≈ 26.6 (Ø overall, Mingda five-core) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | ≈ 26.6 | mm | Mingda five-core unarmored table | ||
| Approx. cable weight | ≈ 1503 | kg/km | Mingda 1503 (Al ≈ 697.4) | ||
| 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. | |||||
8. Application. Sub-main distribution, small motor feeders and control circuits requiring a dedicated PE (earthing) core in one cable (TN-S style) — conduit, tray, trench, duct, trunking; indoor or sheltered outdoor.
9. Ordering. ZR-YJV 0.6/1 kV 5×25 + length/drum + marking; confirm against factory test certificate.
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