ZR-YJV 4*120mm² Flame Retardant Copper Power Cable for Building & Industrial Wiring
ZR-YJV 4*120mm² Flame Retardant Copper Power Cable for Building & Industrial Wiring
Product Summary
ZR-YJV 4*120mm² Flame Retardant Copper Power Cable for Building & Industrial Wiring 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, ...
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, Commonly 37×∅2.03 Mm (also 19×∅2.85 Mm Compact), Conductor Ø ≈ 13.5–14.5 Mm Depending On Compaction
Conductor nominal area (per core):
120 Mm²
Number of cores:
4
Conductor construction:
Class 2, 37×∅2.03 Mm,IEC 60228 / GB/T 3956, Min. 15 Wires
Conductor diameter (approx.):
13.5–14.5 Mm
Insulation (×4):
XLPE
Insulation thickness:
1.2 Mm (120 Mm² Class)
Diameter over insulated core:
15.9–16.9 Mm,conductor + 2×1.2
Filler / binder:
FR PP Filler + FR Tape
Outer sheath:
Flame-retardant PVC (ZR Grade)
Sheath thickness:
2.2 Mm (GB/T 12706 Multi-core 120 Mm² Class)
Overall cable diameter:
37.0 – 44.0 Mm
Design outer diameter:
≈ 40.0 Mm
Approx. weight:
4400 – 5800 Kg/km
Design weight:
≈ 4700 Kg/km
Cable shape:
Round
Product Description
ZR-YJV 4*120mm² Flame Retardant Copper Power Cable for Building & Industrial Wiring
|
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 |
|
4×120 mm² |
Four cores, nominal copper conductor area 120 mm² per core |
ZR-YJV 4×120 mm² — Technical Product Note
1. Product Overview. ZR-YJV 4×120 is a four-core flame-retardant LV power cable — four 120 mm² copper conductors, XLPE insulation, PVC sheath, rated 0.6/1 kV (Um = 1.2 kV), 50 Hz. Built 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, 37 × 2.03 mm (37/2.03, 1+6+12+18) each, 120 mm² per core | — | ≈ 14.20 mm per core |
| Insulation (×4) | Cross-linked polyethylene | 1.2 mm | ≈ 16.60 mm per core (over ins.) |
| Lay-up | Four cores + central filler + binder tape | — | ≈ 40.1 mm (calc.) |
| Sheath | Flame-retarded PVC, ST2, black | 2.1 mm | ≈ 46.0 mm overall |
Approx. weight ≈ 5244 kg/km (Al version ≈ 2178 kg/km).
3. Electrical Ratings. DC resistance ≤ 0.153 Ω/km per core @ 20 °C; routine 3.5 kV / 5 min; XLPE volume resistivity ≥ 1×10¹² Ω·cm; finished insulation resistance ≥ 36.7 MΩ·km; capacitance ≤ 0.45 μF/km. Reference ampacity (four cores loaded) ≈ 285 A in air / 310 A direct-buried @ 25 °C — Mingda 4×120, cross-checked with Mingda 3×120 (285/310 A identical per-core values).
|
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) |
≤ 0.153 Ω/km |
GB/T 3956 max |
|
AC resistance @90 °C (est.) |
≈ 0.199 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 4-core) |
≈ 300–315 A |
common catalogue value |
|
Current rating in air (design) |
≈ 305 A |
apply grouping + ambient correction |
|
Direct buried (20–25 °C, soil 1.0–1.2 K·m/W, 0.7 m) |
≈ 315–355 A |
common catalogue 320–350 A |
|
Design buried rating |
≈ 330 A |
soil thermal resistivity correction required |
|
Short-circuit current (1 s, Cu, 250 °C, per core) |
≈ 12.0 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 4×120 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 4×120 | — | 4 cores × 120 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 | 120 | 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) | 37 wires × 2.03 mm (37/2.03) | — | Class 2 round stranded (1+6+12+18 concentric); nominal 120 mm² per core |
| 11 | Conductor | Conductor diameter (per core) | ≈ 14.20 | mm | Ø of the 37/2.03 stranded core (7 × 2.03) |
| 12 | Conductor | Max. DC resistance of conductor at 20 °C | 0.153 | 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 | 1.2 | mm | GB/T 12706.1 / IEC 60502-1 (0.6/1 kV, 120 mm²) |
| 15 | Insulation | Diameter over insulation (per core) | ≈ 16.60 | mm | ≈ 14.20 + 2 × 1.2 (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 | 2.1 | mm | GB/T 12706.1 / IEC 60502-1 (Mingda four-core table) |
| 19 | Dimensions | Approx. overall diameter | ≈ 46.0 | mm | Mingda 46.0 (four-core unarmored) |
| 20 | Dimensions | Approx. cable weight | ≈ 5244 | kg/km | Mingda 5244 (aluminium version ≈ 2178 kg/km) |
| C. Electrical Performance | |||||
| 21 | Electrical | Max. DC conductor resistance at 20 °C | 0.153 | 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 | ≈ 285 | A | Mingda 285 A; Mingda 3×120 agrees per-core @25 °C |
| 27 | Electrical | Reference ampacity — direct burial, 25 °C | ≈ 310 | A | Mingda 310 A; 3×120 also 310 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 |
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 — select WDZ-YJY where LSZH is mandatory.
| Technical Datasheet — Flame-Retardant (FR) Characteristics | ||
| ZR-YJV 0.6/1 kV 4 × 120 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 × 120 mm² | Four cores, nominal copper conductor area 120 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 / WDZN-YJY for LSZH or NH-ZR-YJV for fire-survival circuits. | ||
| 3. Fire Test Summary | ||
| Test | Requirement | ZR-YJV 4×120 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 / WDZN-YJY |
| 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) | ≤ 0.153 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.199 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 300–315 A (design ≈ 305 A) | 4-core |
| Current rating — direct buried (20–25 °C, soil 1.0–1.2 K·m/W, 0.7 m) | ≈ 315–355 A (design ≈ 330 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 12.0 kA | reference |
| Frequency | 50/60 Hz AC | — |
| Design recommendation: ≈ 305 A in air / ≈ 330 A buried, then apply grouping & ambient + soil-thermal-resistivity correction. Buried rating often > air rating due to better heat dissipation under reference conditions. Catalogue values vary by maker — confirm before specification. | ||
| 5. Construction & Material Specification | ||
| Layer (inside → out) | Description / Specification | FR Contribution |
| Conductor (×4) | Bare annealed copper, Class 2 stranded, 37×∅2.03 mm, conductor Ø ≈ 13.5–14.5 mm | None (Cu non-combustible) |
| Conductor screen | Omitted (not required for 0.6/1 kV) | — |
| Insulation (×4) | XLPE, colours: brown/black/grey/blue etc., 1.2 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), 2.2 mm nominal, black | Primary FR layer (halogenated) |
| Armour | None | — |
| Metallic screen | None | — |
| 6. Dimensional Data | ||
| Item | Typical Value | Remarks |
| Conductor nominal area (per core) | 120 mm² | — |
| Number of cores | 4 | — |
| Conductor construction | Class 2, 37×∅2.03 mm | IEC 60228 / GB/T 3956, min. 15 wires |
| Conductor diameter (approx.) | 13.5–14.5 mm | compact vs solid-round |
| Insulation thickness | 1.2 mm | 120 mm² class |
| Diameter over insulated core | 15.9–16.9 mm | conductor + 2×1.2 |
| Sheath thickness | 2.2 mm | GB/T 12706, 120 mm² class |
| Overall cable diameter | ≈ 38.0–42.0 mm (catalogue range 37.0–44.0 mm) | plain-round design |
| Design outer diameter | ≈ 40.0 mm | common Chinese maker value |
| Approx. weight | 4400 – 5800 kg/km (plain YJV Cu ≈ 4500–4800) | design ≈ 4700 kg/km |
| Cable shape | Round | — |
| 7. Mechanical & Installation Parameters | ||
| Parameter | Value | Note |
| Minimum bending radius (unarmoured multi-core) | ≥ 15 × OD ≈ 555–600 mm @ Ø37–40 mm (≈ 600 mm @ 40 mm) | — |
| Max. pulling tension (Cu only) | 50 N/mm² × 120 mm² × 4 = 24,000 N = 24 kN total | use conductor sock, avoid sheath grip |
| Direct burial | Allowed in non-aggressive soil; for mechanical load / road crossing use ZR-YJV22 4×120 | — |
| Conduit ID | ≥ 1.5 × OD → ≥ 56–60 mm (use 63 mm or 75 mm conduit) | — |
| Fixing spacing | Horizontal tray ≈ 800 mm; vertical ≈ 1500 mm | — |
| Elevation difference limit | None (XLPE) | — |
| 8. Selection Guide — When FR Matters | ||
| Scenario | Recommended Cable | Reason |
| Flame-retardant, halogenated acceptable (standard) | ZR-YJV 4×120 (this cable) | Class C FR, PVC sheath, cost-effective |
| Low-smoke halogen-free required (LSZH) | WDZ-YJY 4×120 | LSZH sheath — IEC 61034 / IEC 60754 compliant |
| Fire-survival circuit (circuit integrity) | NH-ZR-YJV / WDZN-YJY 4×120 | BS 6387 / IEC 60331 fire-survival grade |
| Heavy mechanical load / buried under roads | ZR-YJV22 4×120 | Steel-tape armoured version |
| Separate PE and N required | 5-core version (e.g. 5×120 or 4×120+1×70) | 4×120 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. Plain-round 120 mm² shows maker-to-maker dimensional variance (OD 37–44 mm, weight 4400–5800 kg/km) — always confirm with manufacturer test reports & relevant local regulations before final specification. | ||
6. Verification Plan. Routine: resistance, 3.5 kV/5 min, construction (ins. ≥ 1.2 mm, sheath ≥ 2.1 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).
| ZR-YJV 4×120 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) | ≤ 0.153 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 ≥ 1.2 mm nominal; sheath ≥ 2.1 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; 37 × 2.03 mm; Ø ≈ 14.20 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 |
7.Insulation Test Parameters
| Insulation Test Data | ||
| ZR-YJV 0.6/1 kV 4 × 120 mm² (Cu / XLPE / FR-PVC) | ||
| 1. Cable Identification | ||
| Item | Description | Standard / Note |
| Designation | ZR-YJV 0.6/1 kV 4×120 mm² | GB/T 12706.1-2020 |
| Conductor | Bare annealed copper, Class 2 stranded, 37×∅2.03 mm | GB/T 3956 / IEC 60228 |
| Insulation | XLPE (cross-linked polyethylene), 1.2 mm nominal | GB/T 12706.1-2020 |
| Outer sheath | Flame-retardant PVC (ZR grade), 2.2 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) | 1.2 mm | 120 mm² class |
| Minimum allowable thickness (e_min) | 0.96 mm | eₙ − 0.24 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 | 15.9–16.9 mm | conductor 13.5–14.5 + 2×1.2 |
| 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 | ≤ 0.153 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 = 1.2 mm; e_min ≥ 0.96 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) | ≤ 0.153 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.199 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 300–315 A (design ≈ 305 A) | 4-core |
| Current rating — direct buried (20–25 °C, soil 1.0–1.2 K·m/W, 0.7 m) | ≈ 315–355 A (design ≈ 330 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 12.0 kA | reference |
| Frequency | 50/60 Hz AC | — |
| 6. Dimensional / Inspection Result | ||
| Item | Design / Limit | Measured (example) |
| Conductor construction | Class 2, 37×∅2.03 mm | 37×2.03 mm |
| Conductor diameter | 13.5–14.5 mm | 14.2 mm |
| Insulation thickness (each core) | 1.2 mm (min. 0.96 mm) | 1.22 / 1.20 / 1.21 / 1.18 mm |
| Diameter over insulated core | 15.9–16.9 mm | 16.6 mm |
| Sheath thickness | 2.2 mm (min. 1.9 mm) | 2.21 mm |
| Overall cable diameter | ≈ 38.0–42.0 mm (range 37.0–44.0) | 40.5 mm |
| DC resistance @ 20 °C (per core) | ≤ 0.153 Ω/km | 0.150 Ω/km |
| Approx. weight | 4400 – 5800 kg/km (design ≈ 4700) | 4680 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 120 mm² class = 1.2 mm nominal (GB/T 12706.1-2020, Table 3); minimum = 1.2 − 0.24 = 0.96 mm. Sheath thickness = 2.2 mm for 120 mm² class. | ||
| 5. For low-smoke halogen-free → use WDZ-YJY 4×120; for fire-survival → NH-ZR-YJV / WDZN-YJY 4×120; for armoured → ZR-YJV22 4×120. | ||
| 6. Plain-round 120 mm² shows maker-to-maker dimensional variance (OD 37–44 mm, weight 4400–5800 kg/km); design values are mid-range estimates — verify with manufacturer catalog. | ||
8.Cross Section Structure
| ZR-YJV 4×120 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 — 37 × 2.03 mm per core (37/2.03, 1+6+12+18), nominal 120 mm² per core | — | ≈ 14.20 (Ø per core) | Current-carrying element; max DC resistance ≤ 0.153 Ω/km @ 20 °C (per core) |
| 2 | Insulation (XLPE) × 4 | Cross-linked polyethylene | 1.2 | ≈ 16.60 (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 | — | ≈ 40.1 (Ø over lay-up, calc.) | Forms a round assembly for sheathing |
| 4 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 2.1 | ≈ 46.0 (Ø overall) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | ≈ 46.0 | mm | Mingda four-core unarmored table | ||
| Approx. cable weight | ≈ 5244 | kg/km | Mingda 5244 (Al ≈ 2178) | ||
| 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 4×120 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. Cable Presentation | |||
| ZR-YJV 4×120 is a flame-retarding four-core power cable, rated 0.6/1 kV, that carries four 120 mm² copper cores under XLPE insulation and a single PVC jacket. It follows the construction rules of GB/T 12706.1 / IEC 60502-1 and carries the ZC flame classification by default under GB/T 19666. Outside diameter 46.0 mm and weight 5244 kg/km; coils and drums of 100 m are the normal supply unit. | |||
| The four cores allow a complete three-phase-plus-neutral feed in one cable, which shortens installation time on building services and industrial feeders. | |||
| 2. Conductor Description | |||
| Each 120 mm² core is stranded from thirty-seven 2.03 mm annealed copper wires (37/2.03) laid in four concentric rings (1+6+12+18), Class 2 per GB/T 3956, forming a conductor of ≈ 14.20 mm. Resistance is held to 0.153 Ω/km at 20 °C. The dense ring pack keeps the core round and gives a stable termination area for lugs and glands. | |||
| 3. Insulation & Dielectric | |||
| Cross-linked polyethylene is extruded at 1.2 mm, the wall for the 120 mm² step in GB/T 12706.1, bringing the over-insulation diameter to ≈ 16.60 mm per core. XLPE keeps a 90 °C continuous rating and a 250 °C five-second short-circuit ceiling, with volume resistivity ≥ 1×10¹² Ω·cm and a 3.5 kV five-minute routine proof. | |||
| 4. Assembly & Jacket | |||
| The four insulated cores are laid up with a dry central filler and held with binder tape into a bundle of about 40.1 mm, then jacketed with 2.1 mm of flame-retarded ST2 PVC, closing at 46.0 mm. Fire behaviour satisfies ZC via GB/T 18380.12 and GB/T 18380.35; since PVC is halogen-bearing, LSZH projects should specify WDZ-YJY instead. | |||
| 5. Handling & Application | |||
| • Keep bend radius above 15 × OD. • Apply the DC 4U0 = 2.4 kV / 15 min site test before first energising. • Ambient range −20 to +45 °C; warm the drum for pulls below 0 °C. • Derate the 285 A (air) / 310 A (soil) reference for ambient, grouping and burial factors. • Match lugs and glands to the 14.20 mm core and 46.0 mm sheath. |
9. Usage Cautions. Bend ≥ 15 × OD; use rollers/stockings on long runs; guard against crushing; DC site test before energising; derate for ambient/grouping/burial; fit lugs and glands for the ≈ 14.20 mm core.
10. Application Range. Three-phase + neutral feeders, distribution boards, sub-distribution and large motor circuits at 0.6/1 kV — building risers, plant rooms, transformer secondaries, pump/HVAC circuits — in conduit, tray, trench, duct, trunking; indoor or sheltered outdoor.
9. Ordering. ZR-YJV 0.6/1 kV 4×120 + length/drum + marking. Standard 100 m; confirm against the factory test certificate.
Related Products
XLPE Insulated 4 Core Shielded Cable Copper Power ZR-YJV 4x300mm2 For Power Transmission
XLPE Insulated Flame Retardant Copper Cable ZR-YJV 4*300mm² for Power Transmission 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 — ...
Copper Conductor 4 Cores Cable ZR-YJV 4x240mm2 Flame Retardant Cable For Industrial
Copper Conductor ZR-YJV 4*240mm² Flame Retardant Cable for Industrial Wiring 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 ...
ZR-YJV 4 Core Electrical Cable 4x185mm2 Flame Retardant Copper Power Distribution
ZR-YJV 4*185mm² Flame Retardant 4 Core Copper Power Distribution Cable 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 ...
Copper 4 Cores Cable 3x10mm² + 1x6mm2 For Three Phase Power Wiring
3+1 Core ZR-YJV Flame Retardant Copper Cable 3x10mm²+1x6mm² for Three Phase Power Wiring 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 ...
