ZR-YJV 4×50mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution
ZR-YJV 4×50mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution
Product Summary
ZR-YJV 4×50mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution Technical Datasheet — ZR-YJV 0.6/1 kV 4×50 mm² 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 ...
Product Details
Highlight:
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,zr-yjv 25 sq mm 4 core cable
,1kv 4 cores cable
Conductor (×4):
Bare Annealed Copper, Class 2 Stranded, 19×∅1.78 Mm, Conductor Ø ≈ 9.0 Mm
Conductor nominal area (per core):
50 Mm²
Number of cores:
4
Conductor construction:
Class 2, 19×∅1.78 Mm,min. 19 Wires
Conductor diameter (approx.):
9.0mm
Insulation (×4):
XLPE
Insulation thickness:
1.0 Mm (50 Mm² Class)
Diameter over insulated core:
11.0 Mm,9.0 + 2×1.0
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:
26.0 – 27.5 Mm
Approx. weight:
1080 – 1200 Kg/km
Long-term service temp.:
90 °C
Short-circuit temp. (≤5 s):
250 °C
Emergency overload:
105–130 °C
Routine test:
3.5 KV AC / 5 Min; Type Test 4.0 KV
Volume resistivity @90 °C:
≥ 10¹² Ω·cm
Product Description
ZR-YJV 4×50mm² 0.6/1kV Flame Retardant Copper Cable, XLPE Insulation for Building Power Distribution
Technical Datasheet — ZR-YJV 0.6/1 kV 4×50 mm²
- 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 |
|
4×50 mm² |
Four cores, nominal copper conductor area 50 mm² per core |
Construction: Unarmoured, non-screened, round multi-core
Note: Four-core = three-phase AC with neutral (L1+L2+L3+N) or (L1+L2+L3+PE) with equal conductor sizes. All cores are 50 mm² copper.
- Applicable Standards
- GB/T 12706.1-2020 (equiv. IEC 60502-1)
- GB/T 3956 / IEC 60228 — Conductors (Class 2)
- GB/T 19666-2019 — Flame retardant (ZR = Class C)
- GB/T 18380.3 — Bunched flame test, Class C (char ≤ 2.5 m)
- GB/T 17651 / IEC 61034 — Smoke density (PVC → heavy smoke, not low-smoke)
- GB/T 17650 / IEC 60754 — Halogen content (PVC contains Cl)
| ZR-YJV 4×50 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 4×50 | — | 4 cores × 50 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 | 50 | 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) | 10 wires × 2.52 mm (10/2.52) | — | Class 2 round stranded; nominal section 50 mm² per core (10-wire construction) |
| 11 | Conductor | Conductor diameter (per core) | ≈ 8.40 | mm | Ø of the 10/2.52 stranded core |
| 12 | Conductor | Max. DC resistance of conductor at 20 °C | 0.387 | 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 | 1.0 | mm | GB/T 12706.1 / IEC 60502-1 (0.6/1 kV, 50 mm²; steps up from 0.9 at 35 mm²) |
| 15 | Insulation | Diameter over insulation (per core) | ≈ 10.40 | mm | ≈ 8.40 + 2 × 1.0 (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 | 1.8 | mm | GB/T 12706.1 / IEC 60502-1 (Mingda four-core table) |
| 19 | Dimensions | Approx. overall diameter | ≈ 31.0 | mm | Mingda 31.0 (four-core unarmored) |
| 20 | Dimensions | Approx. cable weight | ≈ 2172 | kg/km | Mingda 2172 (aluminium version ≈ 961.1 kg/km) |
| C. Electrical Performance | |||||
| 21 | Electrical | Max. DC conductor resistance at 20 °C | 0.387 | 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 | ≈ 160 | A | Mingda 160 A; Lvbao 4×50+1×25 also 160 A @25 °C |
| 27 | Electrical | Reference ampacity — direct burial, 25 °C | ≈ 185 | A | Mingda 185 A; Lvbao 4×50+1×25 185 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 4×50 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) | ≤ 0.387 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 ≥ 1.0 mm nominal; sheath ≥ 1.8 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; 10 × 2.52 mm; Ø ≈ 8.40 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 |
- Product Components / Construction (inside → outside)
|
Layer |
Description |
|---|---|
|
Conductor (×4) |
Bare annealed copper, Class 2 stranded, 19×∅1.78 mm, conductor Ø ≈ 9.0 mm |
|
Conductor screen |
Omitted (not required for 0.6/1 kV) |
|
Insulation (×4) |
XLPE, colours: brown/black/grey/blue or red/yellow/blue/green-yellow etc. |
|
Insulation thickness |
1.0 mm (50 mm² class) |
|
Filler |
Flame-retardant PP/PE to form round assembly |
|
Binder |
Flame-retardant tape over laid-up cores |
|
Outer sheath |
Flame-retardant PVC (ZR grade) |
|
Sheath thickness |
1.8 mm (multi-core rule, ≥1.8 mm) |
|
Sheath colour |
Black (standard) |
|
Armour |
None |
|
Metallic screen |
None |
- Dimensional Data
|
Item |
Typical value |
Remarks |
|---|---|---|
|
Conductor nominal area (per core) |
50 mm² |
— |
|
Number of cores |
4 |
— |
|
Conductor construction |
Class 2, 19×∅1.78 mm |
min. 19 wires |
|
Conductor diameter (approx.) |
9.0 mm |
— |
|
Insulation thickness |
1.0 mm |
— |
|
Diameter over insulated core |
11.0 mm |
9.0 + 2×1.0 |
|
Filler / binder |
FR PP filler + FR tape |
round assembly |
|
Sheath thickness |
1.8 mm |
multi-core |
|
Overall cable diameter |
26.0 – 27.5 mm |
use 26.8 mm for design |
|
Approx. weight |
1080 – 1200 kg/km |
use ≈ 1140 kg/km |
|
Cable shape |
Round |
— |
- Insulation Data
- Material: XLPE
- Nominal thickness: 1.0 mm
- Long-term service temp.: 90 °C
- Short-circuit temp. (≤5 s): 250 °C
- Emergency overload: 105–130 °C
- Routine test: 3.5 kV AC / 5 min; type test 4.0 kV
- Volume resistivity @90 °C: ≥ 10¹² Ω·cm
| Insulation Test Data | ||
| ZR-YJV 0.6/1 kV 4 × 50 mm² (Cu / XLPE / FR-PVC) | ||
| 1. Cable Identification | ||
| Item | Description | Standard / Note |
| Designation | ZR-YJV 0.6/1 kV 4×50 mm² | GB/T 12706.1-2020 |
| Conductor | Bare annealed copper, Class 2 stranded, 19×∅1.78 mm | GB/T 3956 / IEC 60228 |
| Insulation | XLPE (cross-linked polyethylene), 1.0 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) | 1.0 mm | 50 mm² class |
| Minimum allowable thickness (e_min) | 0.80 mm | eₙ − 0.20 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 | 11.0 mm | conductor 9.0 + 2×1.0 |
| 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 | ≤ 0.387 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 = 1.0 mm; e_min ≥ 0.80 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) | ≤ 0.387 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.503 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 120–135 A (design ≈ 128 A) | 4-core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 148–165 A (design ≈ 156 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 5.00 kA | reference |
| Frequency | 50/60 Hz AC | — |
| 6. Dimensional / Inspection Result | ||
| Item | Design / Limit | Measured (example) |
| Conductor construction | Class 2, 19×∅1.78 mm | 19×1.78 mm |
| Conductor diameter | ≈ 9.0 mm | 8.9 mm |
| Insulation thickness (each core) | 1.0 mm (min. 0.80 mm) | 1.02 / 1.01 / 1.00 / 0.99 mm |
| Diameter over insulated core | 11.0 mm | 10.9 mm |
| Sheath thickness | 1.8 mm (min. 1.5 mm) | 1.82 mm |
| Overall cable diameter | 26.0 – 27.5 mm (design 26.8) | 26.7 mm |
| DC resistance @ 20 °C (per core) | ≤ 0.387 Ω/km | 0.382 Ω/km |
| Approx. weight | 1080 – 1200 kg/km (≈ 1140) | 1138 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 50 mm² class = 1.0 mm nominal (GB/T 12706.1-2020, Table 3); minimum = 1.0 − 0.20 = 0.80 mm. | ||
| 5. For low-smoke halogen-free → use WDZ-YJY 4×50; for fire-survival → NH-ZR-YJV 4×50; for armoured → ZR-YJV22 4×50. | ||
- Electrical Parameters
|
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) |
≤ 0.387 Ω/km |
GB/T 3956 max |
|
AC resistance @90 °C (est.) |
≈ 0.503 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 4-core) |
≈ 120 – 135 A |
design ≈ 128 A |
|
Direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) |
≈ 148 – 165 A |
design ≈ 156 A |
|
Short-circuit current (1 s, Cu, 250 °C, per core) |
≈ 5.00 kA |
reference |
|
Frequency |
50/60 Hz AC |
— |
Design recommendation: ≈ 128 A in air / ≈ 156 A buried, then apply grouping + ambient correction. Buried rating is higher than air due to better heat dissipation and different reference conditions.
| Technical Datasheet — Flame-Retardant (FR) Characteristics | ||
| ZR-YJV 0.6/1 kV 4 × 50 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 × 50 mm² | Four cores, nominal copper conductor area 50 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 4×50 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) | ≤ 0.387 Ω/km | GB/T 3956 / IEC 60228, Class 2 max |
| AC resistance @ 90 °C (est.) | ≈ 0.503 Ω/km | per core |
| Current rating — in air (30 °C, single circuit) | ≈ 120–135 A (design ≈ 128 A) | 4-core |
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 148–165 A (design ≈ 156 A) | 4-core |
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 5.00 kA | reference |
| Frequency | 50/60 Hz AC | — |
| Design recommendation: ≈ 128 A in air / ≈ 156 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×∅1.78 mm, conductor Ø ≈ 9.0 mm | None (Cu non-combustible) |
| Conductor screen | Omitted (not required for 0.6/1 kV) | — |
| Insulation (×4) | XLPE, colours: brown/black/grey/blue etc., 1.0 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) | 50 mm² | — |
| Number of cores | 4 | — |
| Conductor construction | Class 2, 19×∅1.78 mm | min. 19 wires |
| Conductor diameter (approx.) | 9.0 mm | — |
| Insulation thickness | 1.0 mm | 50 mm² class |
| Diameter over insulated core | 11.0 mm | 9.0 + 2×1.0 |
| Sheath thickness | 1.8 mm | multi-core rule, ≥ 1.8 mm |
| Overall cable diameter | 26.0 – 27.5 mm (use 26.8 mm for design) | — |
| Approx. weight | 1080 – 1200 kg/km (use ≈ 1140 kg/km) | — |
| Cable shape | Round | — |
| 7. Mechanical & Installation Parameters | ||
| Parameter | Value | Note |
| Minimum bending radius (unarmoured multi-core) | ≥ 15 × OD ≈ 402 mm @ Ø26.8 mm | — |
| Max. pulling tension (Cu only) | 50 N/mm² × 50 mm² × 4 = 10,000 N total | use conductor sock, avoid sheath grip |
| Direct burial | Allowed in non-aggressive soil; for mechanical protection use ZR-YJV22 4×50 | — |
| Conduit ID | ≥ 1.5 × OD → ≥ 40 mm (use 50 mm conduit) | — |
| 8. Selection Guide — When FR Matters | ||
| Scenario | Recommended Cable | Reason |
| Flame-retardant, halogenated acceptable (standard) | ZR-YJV 4×50 (this cable) | Class C FR, PVC sheath, cost-effective |
| Low-smoke halogen-free required (LSZH) | WDZ-YJY 4×50 | LSZH sheath — IEC 61034 / IEC 60754 compliant |
| Fire-survival circuit (circuit integrity) | NH-ZR-YJV 4×50 | BS 6387 / IEC 60331 fire-survival grade |
| Heavy mechanical load / direct burial risk | ZR-YJV22 4×50 | Steel-tape armoured version |
| Separate PE and N required | 5-core version | 4×50 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. | ||
- Temperature Characteristics
- Max. conductor operating temp.: 90 °C
- Max. short-circuit temp. (≤5 s): 250 °C
- Emergency overload temp.: 105 °C
- Min. installation ambient temp.: 0 °C (pre-heat below 0 °C)
- Service ambient range: −15 °C to +90 °C (PVC sheath)
- Flame retardant class: Class C (ZR per GB/T 19666)
- Fire Performance (ZR-YJV)
|
Property |
Value / Requirement |
|---|---|
|
Flame retardant |
Class C (bundled, char ≤ 2.5 m) |
|
Halogen content |
Contains Cl (PVC), produces HCl |
|
Smoke density |
Heavy dark smoke (not low-smoke) |
|
Corrosivity |
Corrosive HCl gas |
|
pH / conductivity |
Not certified (PVC base) |
Cross Section Structure
| Product Structure Introduction — ZR-YJV 4×50 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 Overview | |||
| ZR-YJV 4×50 is a flame-retarded four-core power cable for 0.6/1 kV AC distribution, of the copper / XLPE / PVC family, designed and tested to GB/T 12706.1 / IEC 60502-1. Conductors comply with GB/T 3956 / IEC 60228, and the flame class follows GB/T 19666 (ZC default). Approx. outside diameter 31.0 mm, weight 2172 kg/km; standard supply on 100 m coils or drums. | |||
| With four identical 50 mm² cores, the cable serves three-phase circuits while keeping a full-size neutral for unbalanced or harmonic-bearing loads. | |||
| 2. Conductor Design | |||
| At this section the conductor switches from 7-wire to 10-wire stranding: each core carries ten 2.52 mm annealed copper wires (10/2.52, Class 2), laid to ≈ 8.40 mm diameter. Maximum DC resistance is 0.387 Ω/km at 20 °C. The finer wire division eases bending of the heavier cable and reduces eddy-current loss in AC duty. | |||
| 3. Dielectric Design | |||
| The XLPE insulation wall rises to 1.0 mm in the 50 mm² band, taking each core to ≈ 10.40 mm over insulation. The dielectric handles the routine 3.5 kV AC five-minute proof test, supports 90 °C continuous conductor temperature and 250 °C for five seconds of short-circuit, and shows volume resistivity of at least 1×10¹² Ω·cm. | |||
| 4. Core Assembly & Jacket | |||
| Four insulated cores are twisted around a dry central filler into a round bundle of roughly 25.1 mm, secured with binder tape, then sheathed with 1.8 mm of flame-retarded ST2 PVC to a finished ≈ 31.0 mm. The ZC fire performance is certified through GB/T 18380.12 and GB/T 18380.35; because PVC is halogen-bearing, LSZH projects should specify WDZ-YJY. | |||
| 5. Field Notes | |||
| • Maintain bends of at least 15 × OD. • Perform the DC 4U0 = 2.4 kV / 15 min site test before switching on. • Service ambient −20 to +45 °C; warm reels when laying below 0 °C. • Apply ambient, grouping and burial derating to the quoted ampacity. • Terminate with lugs sized for the ≈ 8.40 mm core. |
| ZR-YJV 4×50 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 — 10 × 2.52 mm per core (10/2.52), nominal 50 mm² per core | — | ≈ 8.40 (Ø per core) | Current-carrying element; max DC resistance ≤ 0.387 Ω/km @ 20 °C (per core) |
| 2 | Insulation (XLPE) × 4 | Cross-linked polyethylene | 1 | ≈ 10.40 (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 | — | ≈ 25.1 (Ø over lay-up, calc.) | Forms a round assembly for sheathing |
| 4 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 1.8 | ≈ 31.0 (Ø overall) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | ≈ 31.0 | mm | Mingda four-core unarmored table | ||
| Approx. cable weight | ≈ 2172 | kg/km | Mingda 2172 (Al ≈ 961.1) | ||
| 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. | |||||
For low-smoke halogen-free → use WDZ-YJY 4×50; for fire-survival → NH-ZR-YJV 4×50.
- Mechanical & Installation Parameters
- Minimum bending radius (unarmoured multi-core): ≥ 15 × OD → ≈ 402 mm at Ø26.8 mm
- Max. pulling tension (Cu only): 50 N/mm² × 50 mm² × 4 = 10,000 N total
- Sheath grip: avoid; use conductor sock
- Direct burial: allowed in non-aggressive soil; for mechanical protection use ZR-YJV22 4×50
- Conduit ID: ≥ 1.5 × OD → ≥ 40 mm (use 50 mm conduit)
- Elevation: no limit for XLPE
- Material Specification Summary
|
Component |
Specification |
|---|---|
|
Conductor |
Cu annealed, Class 2, 19×1.78 mm, IEC 60228 |
|
Insulation |
XLPE, 1.0 mm nom., 90 °C |
|
Filler |
Flame-retardant PP/PE |
|
Binder |
Flame-retardant tape |
|
Sheath |
Flame-retardant PVC, 1.8 mm nom. (black) |
|
Armour |
None |
|
Screen |
None |
- Scope of Application / Usage Range
ZR-YJV 0.6/1 kV 4×50 mm² is for fixed installation in LV distribution up to 1.2 kV where flame-retardant (ZR = Class C) PVC-sheathed cable is acceptable.
Typical use:
- Three-phase AC circuits with neutral (L1+L2+L3+N) — primary use of 4-core
- Three-phase AC circuits with protective earth (L1+L2+L3+PE)
- Power distribution, motor feeders with neutral, lighting sub-circuits
- Cable trays, ducts, trenches, shafts in residential / commercial buildings with flame-retardant requirement
- Fixed wiring in industrial plants, workshops
- Direct buried routes (non-aggressive soil, low mechanical impact)
Not suitable for:
- Routes requiring low-smoke halogen-free → use WDZ-YJY 4×50
- Fire-survival circuits → use NH-ZR-YJV 4×50
- Heavy mechanical load → use ZR-YJV22 4×50
- Circuits requiring separate PE and N (use 5-core)
- Packing
- Drum / coil: Steel-wooden drum or coil; 100–500 m typical
- HS code (China): 8544 4921
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