Flame Retardant Power Cable ZR-YJV 3×70mm²+1×35mm² for Industrial Power Distribution
Product Summary
Product Details
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,zr-yjv 25 sq mm 4 core cable
,industrial 4 cores cable
Product Description
Flame Retardant Power Cable ZR-YJV 3×70mm²+1×35mm² for Industrial Power Distribution
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 |
|
3×70+1×35 mm² |
Three phase cores of 70 mm² copper + one reduced neutral core of 35 mm² copper |
ZR-YJV 3×70+1×35 mm² — Cable Specification & Engineering Data
1. Overview & Ratings. ZR-YJV 3×70+1×35 is a flame-retarding 3+1-core cable: three 70 mm² copper phase conductors and one 35 mm² copper neutral conductor, XLPE insulation and one ST2 PVC jacket, rated 0.6/1 kV (Um = 1.2 kV), 50 Hz; manufactured and proof-tested to GB/T 12706.1 / IEC 60502-1, stranding to GB/T 3956, ZC fire class to GB/T 19666. Finished diameter ≈ 39.6 mm (est.), mass ≈ 2800 kg/km (est.), supplied in 100 m coils or wooden drums. Note: this size is not in the Zhongce 3+1 table — dimensions and ampacity are engineering estimates interpolated between 3×50+1×25 and 3×95+1×50; confirm against the factory test certificate.
2. Construction Stack. Conductor → outer jacket:
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Phase conductor (×3) | Annealed Cu, Class 2 compact, 19 × 2.14 mm (1+6+12) each | — | ≈ 10.7 mm |
| Neutral conductor (×1) | Annealed Cu, Class 2 compact, 7 × 2.52 mm (1+6) | — | ≈ 7.56 mm |
| Phase insulation (×3) | XLPE | 1.1 mm | ≈ 12.9 mm |
| Neutral insulation (×1) | XLPE | 0.9 mm | ≈ 9.36 mm |
| Core assembly | Central neutral + 3 phase cores around + PP filler + polyester binder | — | ≈ 35.2 mm (est.) |
| Outer jacket | Flame-retarded PVC, ST2 compound, black | 2.2 mm | ≈ 39.6 mm (est.) |
3. Electrical Ratings. Phase R ≤ 0.268 Ω/km, neutral R ≤ 0.524 Ω/km @ 20 °C; factory proof 3.5 kV AC / 5 min; finished-cable insulation resistance ≥ 36.7 MΩ·km; XLPE volume resistivity ≥ 1×10¹² Ω·cm; capacitance ≤ 0.40 μF/km; inductance ≈ 0.27 mH/km; AC impedance ≈ 0.27 Ω/km; short-circuit current ≈ 8.05 kA for 1 s. Reference current (3 phase cores loaded) ≈ 245 A in air @ 30 °C / 255 A buried @ 25 °C — engineering estimate based on 70 mm² three-core references.
|
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) |
≤ 0.268 Ω/km |
GB/T 3956 max, 70 mm² |
|
DC resistance @20 °C (neutral, per core) |
≤ 0.524 Ω/km |
GB/T 3956 max, 35 mm² |
|
AC resistance @90 °C (est., phase) |
≈ 0.349 Ω/km |
per core |
|
AC resistance @90 °C (est., neutral) |
≈ 0.682 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 3-core+1) |
≈ 180–205 A |
based on 70 mm² phase |
|
Current rating in air (design) |
≈ 190 A |
apply grouping + ambient correction |
|
Direct buried (20–25 °C, soil 1.0–1.2 K·m/W, 0.7 m) |
≈ 205–225 A |
common catalogue 210–218 A |
|
Design buried rating |
≈ 214 A |
soil thermal resistivity correction required |
|
Short-circuit current (1 s, Cu, 250 °C, phase) |
≈ 7.0 kA |
70 mm² reference |
|
Short-circuit current (1 s, Cu, 250 °C, neutral) |
≈ 3.5 kA |
35 mm² reference |
|
Frequency |
50/60 Hz AC |
— |
4.Cable Parameters & Test Parameters
| ZR-YJV 3×70+1×35 mm² — Test & Verification Schedule (GB/T 12706.1 & IEC 60502-1) | ||||
| Stage | Test Item | Method / Standard | Acceptance Criterion | Notes |
| Routine | Phase conductor DC resistance | GB/T 3956 (IEC 60228) | ≤ 0.268 Ω/km @ 20 °C (70 mm²) | Every production length |
| Routine | Neutral conductor DC resistance | GB/T 3956 (IEC 60228) | ≤ 0.524 Ω/km @ 20 °C (35 mm²) | Every production length |
| Routine | Power-frequency withstand | GB/T 12706.1 / IEC 60502-1 | 3.5 kV AC / 5 min, no breakdown | Conductor to earth/water bath |
| Routine | Dimensional inspection | GB/T 2951 | Phase ins. ≥ 1.1 mm; neutral ins. ≥ 0.9 mm; sheath ≥ 2.2 mm; OD within tolerance | Wall & diameter check |
| Routine | Conductor continuity | Visual / electrical | All cores continuous, no break | Every length |
| Sample | XLPE hot-set test | 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 verification |
| Sample | XLPE tensile & elongation | GB/T 2951 | Tensile ≥ 12.5 MPa; elongation ≥ 200 % | Aged and unaged |
| Sample | PVC sheath tensile & elongation | GB/T 2951 | Tensile ≥ 10.0 MPa; elongation ≥ 125 % | Aged and unaged |
| Sample | PVC thermal stability | GB/T 2951 (Congo-red) | ≥ 200 min @ 200 °C | HCI evolution test |
| Sample | Conductor geometry | GB/T 3956 | Phase: 19 × 2.14 mm Ø ≈ 10.7; neutral: 7 × 2.52 mm Ø ≈ 7.56 | Per batch |
| Type | Single-cable flame test | GB/T 18380.12 | No flame to upper reference mark | ZR property |
| Type | Bunched flame test — C | GB/T 18380.35 | Char ≤ 2.5 m; 20 min; ≥ 1.5 L/m | Class C compliance |
| Type | Bending test | GB/T 12706.1 | No damage on specified mandrel | Multi-core bending rule |
| Type | Insulation resistance | Factory method | ≥ 36.7 MΩ·km @ 20 °C | Not routine under GB/T 12706.1 |
| Post-install | DC withstand commissioning | Q/GDW 13244.1-2018 | 2.4 kV DC / 15 min, no breakdown | Required for new installations |
| Post-install | Phase identification | Visual / continuity | L1/L2/L3/N correctly labelled at both ends | Before energisation |
5.Cable Cross Section Structure
| ZR-YJV 3×70+1×35 mm² — Cross-Section Construction Diagram (Schematic) | |||||
| Layered 3+1 conductor build-up from copper strand to PVC jacket · nominal dimensions per GB/T 12706.1 / IEC 60502-1 · dimensions marked (est.) are engineering estimates — confirm with factory certificate | |||||
| No. | Layer | Material / Construction | Nominal Thickness (mm) | Diameter (mm) | Function / Remarks |
| 1 | Phase conductor (Cu) × 3 | Annealed copper, Class 2 compact strand — 19 wires of 2.14 mm per core (19/2.14, 1+6+12 layout), nominal area 70 mm² each | — | ≈ 10.7 (Ø each phase core) | Line-current carrying phase conductors; DC resistance capped at 0.268 Ω/km at 20 °C |
| 2 | Neutral conductor (Cu) × 1 | Annealed copper, Class 2 compact strand — 7 wires of 2.52 mm (7/2.52, 1+6 layout), nominal area 35 mm² | — | ≈ 7.56 (Ø neutral core) | Return / neutral path; DC resistance capped at 0.524 Ω/km at 20 °C |
| 3 | Phase insulation (XLPE) × 3 | Cross-linked polyethylene dielectric | 1.1 | ≈ 12.9 (Ø each phase core, incl. insulation) | Electrical isolation; 90 °C continuous rating; withstands 3.5 kV for 5 min |
| 4 | Neutral insulation (XLPE) × 1 | Cross-linked polyethylene dielectric | 0.9 | ≈ 9.36 (Ø neutral core, incl. insulation) | Electrical isolation for the neutral conductor |
| 5 | Core assembly | Neutral core at centre + three phase cores cabled around + PP filler + polyester binder tape | — | ≈ 35.2 (Ø over assembled cores, est.) | 3+1 configuration; forms a round, stable bundle |
| 6 | Outer jacket (PVC) | Flame-retardant PVC, ST2 compound, black | 2.2 | ≈ 39.6 (Ø finished cable, est.) | Mechanical and moisture protection; ZC flame retardance per GB/T 19666 |
| Key Dimensions & Properties (expanded) | |||||
| Finished cable diameter | ≈ 39.6 | mm | Engineering estimate (not in Zhongce table) | ||
| Approximate cable mass | ≈ 2800 | kg/km | Cu + XLPE + PVC + filler (est.) | ||
| Nominal voltage rating | 0.6/1 | kV | AC 50 Hz; maximum system voltage Um = 1.2 kV | ||
| Conductor temperature limits | 90 / 250 | °C | Continuous service / short-circuit (≤ 5 s) | ||
| Minimum bend radius (multi-core) | ≥ 15 × OD ≈ 594 | mm | OD = actual finished cable diameter | ||
| Flame-retardant classification | ZC (ZR) | — | Per GB/T 19666 | ||
| Short-circuit current (1 s) | ≈ 8.05 | kA | I = k·A/√t, k=115 for Cu/XLPE (est.) | ||
| AC impedance @ 50 Hz | ≈ 0.27 | Ω/km | √(R² + X²); R-dominant (est.) | ||
| Capacitance (typical) | ≤ 0.40 | μF/km | Per phase core (est.) | ||
| Inductance (typical) | ≈ 0.27 | mH/km | Three-core cable (est.) | ||
| Air ampacity @ 30 °C | ≈ 245 | A | Engineering estimate; Cu, 3 phase loaded | ||
| Buried ampacity @ 25 °C | ≈ 255 | A | Engineering estimate; Cu, 3 phase loaded | ||
| Schematic — not to exact scale. Values marked (est.) are engineering estimates interpolated between 3×50+1×25 and 3×95+1×50; confirm against factory test certificate. | |||||
6. Thermal & Fire. 90 °C continuous conductor, 250 °C short-circuit (≤ 5 s); service ambient −20 to +45 °C, minimum laying temp 0 °C; max burial soil temp 25 °C; ZC per GB/T 19666 — GB/T 18380.12 single-cable + GB/T 18380.35 category-C bunched (char ≤ 2.5 m); PVC jacket is halogenated and emits smoke under fire — specify WDZ-YJY for LSZH.
| Flame-Retardant (FR) Characteristics — ZR-YJV 3×70+1×35 mm² | ||
| ZR-YJV 3×70+1×35 mm² (3 (L1+L2+L3, 70 mm²) + 1 (N, 35 mm²); 3+1 = L1+L2+L3+N) · 0.6/1 kV | ||
| 1. Cable Identification | ||
| Code / Item | Meaning / Value | Standard / Note |
| Designation | ZR-YJV 3×70+1×35 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 |
| 3×70+1×35 mm² | Three 70 mm² phase cores + one 35 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 35 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 3×70+1×35 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, 70 mm²) | ≤ 0.268 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| DC resistance @ 20 °C (neutral, 35 mm²) | ≤ 0.524 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (phase, est.) | ≈ 0.349 Ω/km | per phase core |
| Current rating — in air (30 °C, single circuit) | ≈ 175–195 A (design ≈ 185 A) | 3+1 core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 210–240 A (design ≈ 225 A) | 3+1 core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 7.00 kA (per phase core) | phase core; neutral ≈ 3.50 kA |
| 5. Construction & Material Specification (with FR Contribution) | ||
| Layer (inside → out) | Description / Specification | FR Contribution |
| Conductor (phase ×3) | Bare annealed copper, Class 2 stranded, 19×Ø2.14 mm, Ø ≈ 9.20 mm | None (Cu non-combustible) |
| Conductor (neutral ×1) | Bare annealed copper, Class 2 stranded, 19×Ø2.14 mm, Ø ≈ 9.20 mm | None (Cu non-combustible) |
| Conductor screen | Omitted (not required for 0.6/1 kV) | — |
| Insulation (×4) | XLPE (cross-linked polyethylene), phase 1.1 mm (e_min 0.89) / neutral 0.9 mm (e_min 0.71); 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 | 3×70 mm² + 1×35 mm² | phase / neutral |
| Number of cores | 4 (3+1) | — |
| Conductor construction | Phase: Class 2, 19×Ø2.14 mm; Neutral: Class 2, 7×Ø2.52 mm | min. 7 wires |
| Conductor diameter (approx.) | Phase ≈ 9.20 mm; Neutral ≈ 7.50 mm | — |
| Insulation thickness | Phase 1.1 mm; Neutral 0.9 mm (70 / 35 mm² classes) | 0.9 / 0.7 mm class |
| Diameter over insulated core | Phase 11.4 mm; Neutral 9.3 mm | conductor + 2×insulation |
| Sheath thickness | 1.5 mm (multi-core, 3+1 rule) | 3+1 multi-core rule |
| Overall cable diameter | 20.0 – 24.5 mm (design ≈ 22.0 mm) | design ≈ 22.0 mm |
| Approx. weight | 900 – 1140 kg/km (use ≈ 1080 kg/km) | — |
| Cable shape | Round | — |
| 7. Mechanical & Installation Parameters | ||
| Parameter | Value | Note |
| Minimum bending radius (unarmoured multi-core) | ≥ 15 × OD ≈ 330 mm @ Ø≈ 22.0 mm | — |
| Max. pulling tension (Cu only) | 50 N/mm² × (3×70 + 1×35) = 12,250 N total | use conductor sock, avoid sheath grip |
| Direct burial | Allowed in non-aggressive soil; for mechanical protection use ZR-YJV22 3×70+1×35 | — |
| Conduit ID | ≥ 1.5 × OD → ≥ 33 mm (use 40 mm or 50 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 3×70+1×35 mm² (this cable) | Class C FR, PVC sheath, cost-effective |
| Low-smoke halogen-free required (LSZH) | WDZ-YJY 3×70+1×35 | LSZH sheath — IEC 61034 / IEC 60754 compliant |
| Fire-survival circuit (circuit integrity) | NH-ZR-YJV / WDZN-YJY 3×70+1×35 | 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. 3×70+1×35 mm² = three 70 mm² phase cores (L1+L2+L3) + one 35 mm² neutral (N), total 4 cores (3+1); neutral is reduced in size. Current ratings (≈155 A air / ≈185 A buried) are design values; apply grouping, ambient temperature, soil thermal resistivity and IEC 60364-5-52 correction factors. | ||
| 4. For LSZH → WDZ-YJY 3×70+1×35; for fire-survival → NH-ZR-YJV / WDZN-YJY 3×70+1×35; for armour → ZR-YJV22 3×70+1×35; for separate PE → use 5-core (e.g. 5×25). | ||
| 5. DC resistance phase ≤ 0.268 Ω/km, neutral ≤ 0.524 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. Minimum bend ≥ 15 × OD (≈ 594 mm); commissioning DC test 4U0 = 2.4 kV / 15 min before first energisation (Q/GDW 13244.1-2018); warm drums below 0 °C before pulling; max pulling tension ≤ 3000 N; derate the 245/255 A references for ambient, grouping and soil; fit lugs and glands sized for the 10.7 mm phase core, 7.56 mm neutral core and 39.6 mm jacket; verify short-circuit rating against protective device settings.
8. Application. Heavy three-phase four-wire distribution, transformer secondaries, large building mains and industrial feeders requiring a dedicated neutral conductor in a single cable (TN-C style) — conduit, tray, trench, duct, trunking, direct burial; indoor or sheltered outdoor.
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