ZR-YJV 4×70mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution
ZR-YJV 4×70mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution
Product Summary
ZR-YJV 4×70mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution 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...
Product Details
Highlight:
zr-yjv 4 cores cable
,zr-yjv 25 sq mm 4 core cable
,1kv 4 cores cable
Conductor (×4):
Bare Annealed Copper, Class 2 Stranded, 19×∅2.14 Mm, Conductor Ø ≈ 10.7 Mm
Conductor nominal area (per core):
70 Mm²
Number of cores:
4
Conductor construction:
Class 2, 19×∅2.14 Mm,min. 19 Wires
Conductor diameter (approx.):
10.7mm
Insulation (×4):
XLPE
Insulation thickness:
1.1 Mm (70 Mm² Class)
Diameter over insulated core:
12.9 Mm,10.7 + 2×1.1
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:
29.5 – 31.5 Mm
Approx. weight:
1450 – 1600 Kg/km
Long-term service temp.:
90 °C
Short-circuit temp. (≤5 s):
250 °C
Emergency overload:
105–130 °C
Routine test:
Routine Test
Volume resistivity @90 °C:
≥ 10¹² Ω·cm
Product Description
ZR-YJV 4×70mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution
|
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 |
|
4×70 mm² |
Four cores, nominal copper conductor area 70 mm² per core |
ZR-YJV 4×70 mm² — Technical Specification Sheet
1. Product at a Glance. ZR-YJV 4×70 is a four-core flame-retardant LV power cable — four 70 mm² copper conductors, XLPE insulation, PVC sheath, rated 0.6/1 kV (Um = 1.2 kV), 50 Hz. Conforms to GB/T 12706.1 / IEC 60502-1; conductors per GB/T 3956 / IEC 60228; fire class ZC (ZR) per GB/T 19666 / GB/T 18380.
2. Construction Stack. Conductor → outer sheath:
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor (×4) | Annealed Cu, Class 2, 19 × 2.14 mm (19/2.14, 1+6+12) each, 70 mm² per core | — | ≈ 10.70 mm per core |
| Insulation (×4) | Cross-linked polyethylene | 1.1 mm | ≈ 12.90 mm per core (over ins.) |
| Lay-up | Four cores + central filler + binder tape | — | ≈ 31.1 mm (calc.) |
| Sheath | Flame-retarded PVC, ST2, black | 1.9 mm | ≈ 36.4 mm overall |
Approx. weight ≈ 3080 kg/km (Al version ≈ 1331 kg/km).
3. Electrical Ratings. DC resistance ≤ 0.268 Ω/km per core @ 20 °C; routine 3.5 kV / 5 min; XLPE volume resistivity ≥ 1×10¹² Ω·cm; typical finished insulation resistance ≥ 36.7 MΩ·km; capacitance ≤ 0.45 μF/km per core. Reference ampacity (four cores loaded) ≈ 200 A in air / 225 A direct-buried @ 25 °C — Mingda 4×70 and Lvbao 4×70+1×35 agree exactly (200/225 A).
|
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) |
≤ 0.268 Ω/km |
GB/T 3956 max |
|
AC resistance @90 °C (est.) |
≈ 0.348 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 4-core) |
≈ 155 – 175 A |
design ≈ 165 A |
|
Direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) |
≈ 190 – 210 A |
design ≈ 200 A |
|
Short-circuit current (1 s, Cu, 250 °C, per core) |
≈ 7.00 kA |
reference |
|
Frequency |
50/60 Hz AC |
— |
4. Thermal & Mechanical. Continuous 90 °C; short-circuit 250 °C (≤ 5 s); ambient −20 to +45 °C; laying ≥ 0 °C; min. bend radius ≥ 15 × OD (multi-core).
| ZR-YJV 4×70 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 4×70 | — | 4 cores × 70 mm²; Cu / XLPE / PVC |
| 3 | Identification | Design standards | GB/T 12706.1; IEC 60502-1 | — | Conductor: GB/T 3956 / IEC 60228; fire rating: 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 | — | Three phases (L1/L2/L3) + neutral (N) |
| 7 | Identification | Nominal cross-sectional area | 70 | mm² | Per core; nominal section per GB/T 3956 |
| B. Cable Construction (from conductor to outer sheath) | |||||
| 8 | Conductor | Material | Plain annealed copper (Cu) | — | High-conductivity 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) | 19 wires × 2.14 mm (19/2.14) | — | Class 2 round stranded (1+6+12 concentric); 14 × 2.52 also used; nominal 70 mm² per core |
| 11 | Conductor | Conductor diameter (per core) | ≈ 10.70 | mm | Ø of the 19/2.14 stranded core (5 × 2.14) |
| 12 | Conductor | Max. DC resistance of conductor at 20 °C | 0.268 | Ω/km | GB/T 3956, Class 2 copper |
| 13 | Insulation | Material | Cross-linked polyethylene (XLPE) | — | Thermally cross-linked; natural/transparent |
| 14 | Insulation | Nominal insulation thickness | 1.1 | mm | GB/T 12706.1 / IEC 60502-1 (0.6/1 kV, 70 mm²) |
| 15 | Insulation | Diameter over insulation (per core) | ≈ 12.90 | mm | ≈ 10.70 + 2 × 1.1 (calculated) |
| 16 | Lay-up | Core assembly | Four insulated cores laid up around a central non-hygroscopic filler; binder tape over the bundle | — | Round construction; classic 4-core geometry |
| 17 | Sheath | Material | Flame-retardant polyvinyl chloride (PVC, ST2 type) | — | Colour: black (or as ordered) |
| 18 | Sheath | Nominal sheath thickness | 1.9 | mm | GB/T 12706.1 / IEC 60502-1 (Mingda four-core table) |
| 19 | Dimensions | Approx. overall diameter | ≈ 36.4 | mm | Mingda 36.4 (four-core unarmored) |
| 20 | Dimensions | Approx. cable weight | ≈ 3080 | kg/km | Mingda 3080 (aluminium version ≈ 1331 kg/km) |
| C. Electrical Performance | |||||
| 21 | Electrical | Max. DC conductor resistance at 20 °C | 0.268 | 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 | ≈ 200 | A | Mingda 200 A; Lvbao 4×70+1×35 also 200 A @25 °C |
| 27 | Electrical | Reference ampacity — direct burial, 25 °C | ≈ 225 | A | Mingda 225 A; Lvbao 4×70+1×35 225 A; soil thermal resistivity dependent |
| 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 |
| 37 | Installation | Laying methods | Conduit, tray, cable trench, duct, building trunking, supported/suspended aerial | — | 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 |
| 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 |
Test Parameters
| ZR-YJV 4×70 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) | ≤ 0.268 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 ≥ 1.1 mm nominal; sheath ≥ 1.9 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; 19 × 2.14 mm; Ø ≈ 10.70 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 |
5. Fire Behaviour. Passes GB/T 18380.12 single-burn and class-C bunched GB/T 18380.35 (char ≤ 2.5 m) → ZC per GB/T 19666. PVC is halogen-containing — choose WDZ-YJY where LSZH is mandated.
| Technical Datasheet — Flame-Retardant (FR) Characteristics | ||
| ZR-YJV 0.6/1 kV 4 × 70 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 × 70 mm² | Four cores, nominal copper conductor area 70 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) | — |
| Note: ZR = Flame Retardant only — it does NOT imply low-smoke (LSZH) or fire-survival. PVC sheath is halogenated; upgrade to WDZ-YJY for LSZH or NH-ZR-YJV for fire-survival circuits. | ||
| 3. Fire Test Summary | ||
| Test | Requirement | ZR-YJV 4×70 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) | ≤ 0.268 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.348 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 155–175 A (design ≈ 165 A) | 4-core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 190–210 A (design ≈ 200 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 7.00 kA | reference |
| Frequency | 50/60 Hz AC | — |
| Design recommendation: ≈ 165 A in air / ≈ 200 A buried, then apply grouping & ambient temperature correction. Buried rating > air rating due to better heat dissipation & different reference conditions. | ||
| 5. Construction & Material Specification | ||
| Layer (inside → out) | Description / Specification | FR Contribution |
| Conductor (×4) | Bare annealed copper, Class 2 stranded, 19×∅2.14 mm, conductor Ø ≈ 10.7 mm | None (Cu non-combustible) |
| Conductor screen | Omitted (not required for 0.6/1 kV) | — |
| Insulation (×4) | XLPE, colours: brown/black/grey/blue etc., 1.1 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) | 70 mm² | — |
| Number of cores | 4 | — |
| Conductor construction | Class 2, 19×∅2.14 mm | min. 19 wires |
| Conductor diameter (approx.) | 10.7 mm | — |
| Insulation thickness | 1.1 mm | 70 mm² class |
| Diameter over insulated core | 12.9 mm | 10.7 + 2×1.1 |
| Sheath thickness | 1.8 mm | multi-core rule, ≥ 1.8 mm |
| Overall cable diameter | 29.5 – 31.5 mm (use 30.6 mm for design) | — |
| Approx. weight | 1450 – 1600 kg/km (use ≈ 1520 kg/km) | — |
| Cable shape | Round | — |
| 7. Mechanical & Installation Parameters | ||
| Parameter | Value | Note |
| Minimum bending radius (unarmoured multi-core) | ≥ 15 × OD ≈ 459 mm @ Ø30.6 mm | — |
| Max. pulling tension (Cu only) | 50 N/mm² × 70 mm² × 4 = 14,000 N total | use conductor sock, avoid sheath grip |
| Direct burial | Allowed in non-aggressive soil; for mechanical protection use ZR-YJV22 4×70 | — |
| Conduit ID | ≥ 1.5 × OD → ≥ 46 mm (use 50 mm or 63 mm conduit) | — |
| Elevation difference limit | None (XLPE) | — |
| 8. Selection Guide — When FR Matters | ||
| Scenario | Recommended Cable | Reason |
| Flame-retardant, halogenated acceptable (standard) | ZR-YJV 4×70 (this cable) | Class C FR, PVC sheath, cost-effective |
| Low-smoke halogen-free required (LSZH) | WDZ-YJY 4×70 | LSZH sheath — IEC 61034 / IEC 60754 compliant |
| Fire-survival circuit (circuit integrity) | NH-ZR-YJV 4×70 | BS 6387 / IEC 60331 fire-survival grade |
| Heavy mechanical load / direct burial risk | ZR-YJV22 4×70 | Steel-tape armoured version |
| Separate PE and N required | 5-core version | 4×70 has combined/shared PE-N only |
| Applicable standards: GB/T 12706.1-2020 (equiv. IEC 60502-1) · GB/T 3956 / IEC 60228 · GB/T 19666-2019 · GB/T 18380.3 · GB/T 17651 / IEC 61034 · GB/T 17650 / IEC 60754. | Packing: steel-wooden drum or coil, 100–500 m typical. | HS code (China): 8544 4921. | ||
| Values are typical / design reference. Always confirm with manufacturer test reports & relevant local regulations before final specification. | ||
6. Verification Plan. Routine: resistance, 3.5 kV/5 min, construction (ins. ≥ 1.1 mm, sheath ≥ 1.9 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 × 70 mm² (Cu / XLPE / FR-PVC) | ||
| 1. Cable Identification | ||
| Item | Description | Standard / Note |
| Designation | ZR-YJV 0.6/1 kV 4×70 mm² | GB/T 12706.1-2020 |
| Conductor | Bare annealed copper, Class 2 stranded, 19×∅2.14 mm | GB/T 3956 / IEC 60228 |
| Insulation | XLPE (cross-linked polyethylene), 1.1 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) | 1.1 mm | 70 mm² class |
| Minimum allowable thickness (e_min) | 0.89 mm | eₙ − 0.21 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 | 12.9 mm | conductor 10.7 + 2×1.1 |
| 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 | ≤ 0.268 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 = 1.1 mm; e_min ≥ 0.89 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) | ≤ 0.268 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.348 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 155–175 A (design ≈ 165 A) | 4-core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 190–210 A (design ≈ 200 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 7.00 kA | reference |
| Frequency | 50/60 Hz AC | — |
| 6. Dimensional / Inspection Result | ||
| Item | Design / Limit | Measured (example) |
| Conductor construction | Class 2, 19×∅2.14 mm | 19×2.14 mm |
| Conductor diameter | ≈ 10.7 mm | 10.6 mm |
| Insulation thickness (each core) | 1.1 mm (min. 0.89 mm) | 1.12 / 1.10 / 1.09 / 1.08 mm |
| Diameter over insulated core | 12.9 mm | 12.8 mm |
| Sheath thickness | 1.8 mm (min. 1.5 mm) | 1.83 mm |
| Overall cable diameter | 29.5 – 31.5 mm (design 30.6) | 30.5 mm |
| DC resistance @ 20 °C (per core) | ≤ 0.268 Ω/km | 0.264 Ω/km |
| Approx. weight | 1450 – 1600 kg/km (≈ 1520) | 1518 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 70 mm² class = 1.1 mm nominal (GB/T 12706.1-2020, Table 3); minimum = 1.1 − 0.21 = 0.89 mm. | ||
| 5. For low-smoke halogen-free → use WDZ-YJY 4×70; for fire-survival → NH-ZR-YJV 4×70; for armoured → ZR-YJV22 4×70. | ||
7.Cross Section Structure
| ZR-YJV 4×70 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 — 19 × 2.14 mm per core (19/2.14, 1+6+12), nominal 70 mm² per core | — | ≈ 10.70 (Ø per core) | Current-carrying element; max DC resistance ≤ 0.268 Ω/km @ 20 °C (per core) |
| 2 | Insulation (XLPE) × 4 | Cross-linked polyethylene | 1.1 | ≈ 12.90 (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 | — | ≈ 31.1 (Ø over lay-up, calc.) | Forms a round assembly for sheathing |
| 4 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 1.9 | ≈ 36.4 (Ø overall) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | ≈ 36.4 | mm | Mingda four-core unarmored table | ||
| Approx. cable weight | ≈ 3080 | kg/km | Mingda 3080 (Al ≈ 1331) | ||
| 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 4×70 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 Introduction | |||
| ZR-YJV 4×70 is a flame-retarded four-core power cable rated 0.6/1 kV AC, following the copper / XLPE / PVC platform and the requirements of GB/T 12706.1 / IEC 60502-1, with stranding in accordance with GB/T 3956 / IEC 60228 and fire classification under GB/T 19666 (ZC default). Approx. outside diameter 36.4 mm, weight 3080 kg/km; standard delivery on 100 m coils or drums. | |||
| Four equal 70 mm² cores give the cable a high continuous current of 200 A in air while keeping the neutral full-sized for unbalanced three-phase loads. | |||
| 2. Conductor Structure | |||
| The 70 mm² core is stranded concentrically from nineteen 2.14 mm annealed copper wires — 19/2.14 in a 1+6+12 arrangement, Class 2 — forming ≈ 10.70 mm diameter. Maximum DC resistance is 0.268 Ω/km at 20 °C. Where the manufacturer prefers, 14 × 2.52 is an equivalent alternative stranding of the same class. | |||
| 3. Insulation Structure | |||
| Insulation thickness rises to 1.1 mm at this section, putting the over-insulation diameter at ≈ 12.90 mm per core. XLPE provides a continuous rating of 90 °C, a five-second short-circuit capability at 250 °C, volume resistivity of at least 1×10¹² Ω·cm, and clearance of the routine 3.5 kV AC, five-minute proof test. | |||
| 4. Assembly, Sheath & Fire | |||
| The four insulated cores are cabled around a dry central filler into a round assembly of about 31.1 mm and bound with tape, then covered by a 1.9 mm flame-retarded ST2 PVC jacket to finish at ≈ 36.4 mm. ZC flame behaviour is demonstrated under GB/T 18380.12 and GB/T 18380.35; PVC being halogen-bearing, LSZH applications call for WDZ-YJY instead. | |||
| 5. Site & Handling Notes | |||
| • Respect a minimum bending radius of 15 × OD. • Run the DC 4U0 = 2.4 kV / 15 min site test before energising. • Ambient −20 to +45 °C; warm drums when pulling below 0 °C. • Derate the quoted ampacity for ambient, grouping and burial. • Fit lugs and glands for the ≈ 10.70 mm core. |
8. Usage Cautions. Bend ≥ 15 × OD; use stockings and rollers for heavy-drum pulls; avoid sharp saddles and twisting; protect from sun/impact; run the DC site test before energising; derate for ambient/grouping/burial; fit lugs sized for the ≈ 10.70 mm core.
9. Application Range. Three-phase + neutral feeders, sub-distribution and larger motor circuits at 0.6/1 kV — building risers, plant rooms, transformer secondaries, HVAC/pump circuits — in conduit, tray, trench, duct, trunking; indoor or sheltered outdoor.
10. Ordering. ZR-YJV 0.6/1 kV 4×70 + length/drum type + marking. Standard 100 m; confirm against the factory test certificate.
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