2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power
2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power
Product Summary
ZR-YJV 2*50mm² Flame Retardant 2 Core Cable, 0.6/1kV Stranded Copper, XLPE Insulation PVC Jacket for Construction Power Code Mean:ZR-Flame Retardant,YJ-XLPE Insulation,V-PVC Jacket ZR-YJV 2×50 mm² — Cable Data Report 1. Product Summary. ZR-YJV 2×50 is a two-core flame-retardant power cable — twin 50 ...
Product Details
Highlight:
2 x 50mm2 2 core shielded cable
,Construction Power 2 core shielded cable
,pvc jacket wire IEC 60502-1
Conductor (×2):
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:
2
Conductor construction:
Class 2, 19×∅1.78 Mm,min. 19 Wires
Conductor diameter (approx.):
9.0mm
Insulation (×2):
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
Sheath thickness:
1.8 Mm
Overall cable diameter:
22.5 – 23.5 Mm
Approx. weight:
720 – 800 Kg/km,use ≈ 760 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 2*50mm² Flame Retardant 2 Core Cable, 0.6/1kV Stranded Copper, XLPE Insulation PVC Jacket for Construction Power
Code Mean:ZR-Flame Retardant,YJ-XLPE Insulation,V-PVC Jacket
ZR-YJV 2×50 mm² — Cable Data Report
1. Product Summary. ZR-YJV 2×50 is a two-core flame-retardant power cable — twin 50 mm² copper conductors, XLPE insulation, PVC sheath, rated 0.6/1 kV (Um = 1.2 kV), 50 Hz. Conformance: GB/T 12706.1 / IEC 60502-1, core GB/T 3956 / IEC 60228, fire GB/T 19666 / GB/T 18380 (default ZC).
2. Construction Overview. Core-to-jacket stack:
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor (×2) | Annealed copper, Class 2, 10 × 2.52 mm (10/2.52) each, 50 mm² per core | — | ≈ 8.3 mm per core |
| Insulation (×2) | Cross-linked polyethylene | 1.0 mm | ≈ 10.3 mm per core (over ins.) |
| Lay-up | Two cores + non-hygroscopic filler, optional binder tape | — | ≈ 20.6 mm |
| Sheath | Flame-retarded PVC, ST2, black | 1.8 mm | ≈ 26.2 mm overall |
Weight ≈ 1194 kg/km (Al version ≈ 588.6).
3. Electrical Ratings. DC resistance ≤ 0.387 Ω/km per core @ 20 °C; routine 3.5 kV / 5 min; XLPE volume resistivity ≥ 1×10¹² Ω·cm; typical insulation resistance ≥ 36.7 MΩ·km; capacitance ≤ 0.45 μF/km per core. Reference ampacity (both cores loaded) ≈ 226 A in air (30 °C) and ≈ 275 A direct-buried (20 °C) per Chengtantai; Mingda's table quotes 190 A/210 A @25 °C — derate per GB/T 16895 / IEC 60364.
|
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, 2-core) |
≈ 125 – 135 A |
design ≈ 130 A |
|
Direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) |
≈ 155 – 170 A |
design ≈ 163 A |
|
Short-circuit current (1 s, Cu, 250 °C, per core) |
≈ 5.00 kA |
reference |
|
Frequency |
50/60 Hz AC (DC usable) |
— |
4. Thermal & Bending. Continuous 90 °C; short-circuit 250 °C (≤ 5 s); ambient −20 to +45 °C; laying ≥ 0 °C; minimum bend radius ≥ 15 × OD (multi-core).
| ZR-YJV 2×50 mm² Flame-Retardant Copper-Conductor XLPE-Insulated PVC-Sheathed Power Cable — Product Parameters (0.6/1 kV, Two-Core) | |||||
| Construction: CU / XLPE / PVC, 2 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 (two-core) | — | Designation ZR-YJV; "ZR" = flame-retardant (halogen-containing) |
| 2 | Identification | Model designation | ZR-YJV 2×50 | — | 2 cores × 50 mm²; Cu / XLPE / PVC |
| 3 | Identification | Design standards | GB/T 12706.1; IEC 60502-1 | — | Conductor: GB/T 3956 / IEC 60228; flame retardance: 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 | 2 | — | Two-core cable; phase + neutral (L+N) duty |
| 7 | Identification | Nominal cross-sectional area | 50 | mm² | Per core; nominal cross-section per GB/T 3956 |
| B. Cable Construction (from conductor to outer sheath) | |||||
| 8 | Conductor | Material | Plain annealed copper (Cu) | — | High-conductivity electrolytic / oxygen-free 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 |
| 11 | Conductor | Conductor diameter (per core) | ≈ 8.3 | mm | Ø of the 10/2.52 stranded core (8.0–8.4 mm across practice) |
| 12 | Conductor | Max. DC resistance of conductor at 20 °C | 0.387 | Ω/km | GB/T 3956, Class 2 copper; acceptance criterion for 50 mm² |
| 13 | Insulation | Material | Cross-linked polyethylene (XLPE) | — | Thermally cross-linked; natural/transparent colour |
| 14 | Insulation | Nominal insulation thickness | 1.0 | mm | GB/T 12706.1 / IEC 60502-1 (0.6/1 kV, 50 mm²) |
| 15 | Insulation | Diameter over insulation (per core) | ≈ 10.3 | mm | ≈ 8.3 + 2 × 1.0 (calculated) |
| 16 | Lay-up | Core assembly | Two insulated cores laid up with non-hygroscopic filler; optional binder tape | — | Round construction, right-hand lay |
| 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 two-core table) |
| 19 | Dimensions | Approx. overall diameter | 26.2 | mm | Mingda unarmored table 26.2; armored YJV22 2×50 ≈ 28.0 mm |
| 20 | Dimensions | Approx. cable weight | ≈ 1194 | kg/km | Mingda 1194 (aluminium version ≈ 588.6 kg/km); armored YJV22 2×50 ≈ 1412 kg/km |
| C. Electrical Performance | |||||
| 21 | Electrical | Max. DC conductor resistance at 20 °C | 0.387 | Ω/km | GB/T 3956; routine measurement |
| 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, 30 °C, both cores loaded | ≈ 226 | A | Chengtantai two-core table (226 A Cu); Mingda quotes 190 A @25 °C — derate per GB/T 16895 / IEC 60364 |
| 27 | Electrical | Reference ampacity — direct burial, 20 °C | ≈ 275 | A | Chengtantai two-core table (275 A Cu); Mingda quotes 210 A @25 °C — depends on soil thermal resistivity |
| 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; OD = actual cable diameter |
| 37 | Installation | Laying methods | Conduit, tray, cable trench, duct, building trunking, supported/suspended aerial | — | Also 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; practice may vary by project |
| 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.Test Parameters
| ZR-YJV 2×50 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 ≈ 8.3 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 |
6. Fire Behaviour. Passes GB/T 18380.12 single burn and class-C bunched burn GB/T 18380.35 (char ≤ 2.5 m) → ZC per GB/T 19666. PVC contains halogen — WDZ-YJY for LSZH duty.
| Technical Datasheet — Flame-Retardant (FR) Characteristics | ||||
| ZR-YJV 0.6/1 kV 2 × 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 | ||
| 2 × 50 mm² | Two cores, nominal copper conductor area 50 mm² per core (both cores equal) | — | ||
| Construction | Unarmoured, non-screened, round multi-core | — | ||
| Application note | Two-core → single-phase AC (L+N) or DC pair (+, −) | — | ||
| 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 2×50 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 | ❌ NOT applicable (PVC → heavy smoke) | ||
| Halogen content (IEC 60754) | ≤ 0.5 % HCl for LSZH | ❌ NOT applicable (contains Cl) | ||
| Acidity / corrosivity (IEC 60754-2) | pH ≥ 4.3; conductivity ≤ 10 µS/mm for LSZH | ❌ NOT certified (corrosive HCl) | ||
| Fire-survival (BS 6387 / IEC 60331) | Circuit integrity during/after fire | ❌ NOT applicable — 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) | ≈ 125–135 A (design ≈ 130 A) | 2-core | ||
| Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 155–170 A (design ≈ 163 A) | 2-core | ||
| Short-circuit current (1 s, Cu, 250 °C, per core) | ≈ 5.00 kA | reference | ||
| Frequency | 50/60 Hz AC (DC usable) | — | ||
| Design recommendation: ≈ 130 A in air / ≈ 163 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 (×2) | 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 (×2) | XLPE, colours: red / black / 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 | 2 | — | ||
| 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 | 22.5 – 23.5 mm (use 23.0 mm for design) | — | ||
| Approx. weight | 720 – 800 kg/km (use ≈ 760 kg/km) | — | ||
| Cable shape | Round | — | ||
| 7. Mechanical & Installation Parameters | ||||
| Parameter | Value | Note | ||
| Minimum bending radius (unarmoured multi-core) | ≥ 15 × OD ≈ 345 mm @ Ø23.0 mm | — | ||
| Max. pulling tension (Cu only) | 50 N/mm² × 50 mm² × 2 = 5,000 N total | use conductor sock, avoid sheath grip | ||
| Direct burial | Allowed in non-aggressive soil; for mechanical protection use ZR-YJV22 2×50 | — | ||
| Conduit ID | ≥ 1.5 × OD → ≥ 35 mm (use 40 mm or 50 mm conduit) | — | ||
| Elevation difference limit | None (XLPE) | — | ||
| 8. Selection Guide — When FR Matters | ||||
| Scenario | Recommended Cable | Reason | ||
| Flame-retardant, halogenated acceptable (standard) | ZR-YJV 2×50 (this cable) | Class C FR, PVC sheath, cost-effective | ||
| Low-smoke halogen-free required (LSZH) | WDZ-YJY 2×50 | LSZH sheath — IEC 61034 / IEC 60754 compliant | ||
| Fire-survival circuit (circuit integrity) | NH-ZR-YJV 2×50 | BS 6387 / IEC 60331 fire-survival grade | ||
| Heavy mechanical load / direct burial risk | ZR-YJV22 2×50 | Steel-tape armoured version | ||
| Three-phase circuit | 3 / 4 / 5-core version | 2-core unsuitable for 3-phase | ||
| 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. | ||||
7. Verification. Routine: resistance, 3.5 kV/5 min, dimension audit (ins. ≥ 1.0 mm, sheath ≥ 1.8 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).
| Technical Datasheet — Insulation Test Data / ZR-YJV 0.6/1 kV 2×50 mm² | |||||
| XLPE Insulated, Flame-Retardant PVC Sheathed Power Cable — Insulation Characteristics & Test Schedule | |||||
| 1. Cable Identification | |||||
| # | Item | Value | Unit | Standard / Reference | Remarks |
| 1 | Cable designation | ZR-YJV 0.6/1 kV 2×50 | — | GB/T 12706.1-2020 (IEC 60502-1) | Unarmoured, non-screened, round |
| 2 | Conductor material | Bare annealed copper | — | GB/T 3956 / IEC 60228 | Class 2 stranded |
| 3 | Conductor construction | 19 × Ø1.78 | mm | IEC 60228 | min. 19 wires |
| 4 | Conductor nominal area (per core) | 50 | mm² | GB/T 3956 | Both cores 50 mm² |
| 5 | Number of cores | 2 | — | — | L+N (AC) or +/− (DC) |
| 6 | Insulation material | XLPE (cross-linked polyethylene) | — | GB/T 12706.1-2020 | Cross-linked polyethylene |
| 7 | Sheath material | Flame-retardant PVC (ZR) | — | GB/T 19666-2019 | Contains halogen (Cl) |
| 8 | Rated voltage U₀/U | 0.6 / 1 | kV | IEC 60502-1 | Uₘ = 1.2 kV |
| 2. Insulation Design Data | |||||
| # | Item | Value | Unit | Standard / Reference | Remarks |
| 1 | Insulation material | XLPE | — | GB/T 12706.1-2020 | Cross-linked polyethylene |
| 2 | Nominal insulation thickness | 1.0 | mm | GB/T 12706.1-2020, Tab. 3 | 50 mm² class |
| 3 | Minimum insulation thickness (allowable) | 0.80 | mm | GB/T 12706.1-2020 | 90% × 1.0 − 0.1 mm |
| 4 | Insulator colour (typical) | Red / Black / Blue | — | GB/T 6995 / IEC 60227 | Per phase / neutral |
| 5 | Diameter over insulated core | 11.0 | mm | Calculated | Conductor 9.0 + 2×1.0 |
| 6 | Conductor diameter (approx.) | 9.0 | mm | Calculated | 19 × Ø1.78 mm |
| 7 | Volume resistivity @ 90 °C | ≥ 10¹² | Ω·cm | GB/T 12706.1-2020 | XLPE typical |
| 8 | Dielectric loss factor tan δ | < 0.001 | — | IEC 60502-2 (ref.) | XLPE, 20 °C, 50 Hz |
| 9 | Relative permittivity εᵣ | 2.3 – 2.5 | — | Material data | XLPE typical |
| 3. Thermal Characteristics of Insulation | |||||
| # | Item | Value | Unit | Standard / Reference | Remarks |
| 1 | Maximum conductor operating temp. (long-term) | 90 | °C | GB/T 12706.1-2020 | XLPE rated |
| 2 | Maximum short-circuit temp. (≤ 5 s) | 250 | °C | IEC 60502-1 | Copper conductor |
| 3 | Emergency overload temp. (short-term) | 105 – 130 | °C | GB/T 12706.1-2020 | Limited duration |
| 4 | Minimum installation ambient temp. | 0 | °C | GB/T 12706.1-2020 | Pre-heat below 0 °C |
| 5 | Service ambient range (PVC sheath) | −15 to +90 | °C | GB/T 19666-2019 | Sheath limit |
| 6 | Thermal stability (XLPE) | Stable to ≥ 250 | °C | Material data | Cross-linked |
| 4. Insulation Test Schedule (Routine / Type / Sample) | |||||
| # | Test Item | Test Value / Condition | Result | Standard / Reference | Remarks |
| 1 | Routine spark / withstand test (insulated core) | 3.5 kV AC, 5 min | PASS | GB/T 12706.1-2020 / IEC 60502-1 | Applied per core |
| 2 | Type test — AC withstand voltage | 4.0 kV AC, 4 h | PASS | IEC 60502-1 | After laying-up |
| 3 | Partial discharge test (type) | ≤ 10 pC @ 1.73 U₀ | PASS | GB/T 12706.1-2020 / IEC 60502-1 | XLPE, 1.73 kV |
| 4 | Insulation resistance (DC, 20 °C) | ≥ 200 MΩ·km | — | GB/T 3048 / IEC 60060 | Reference value |
| 5 | Volume resistivity @ 90 °C | ≥ 10¹² Ω·cm | PASS | GB/T 12706.1-2020 | Material check |
| 6 | Tangent delta (tan δ) — dielectric loss | < 0.001 (20 °C, 50 Hz) | PASS | IEC 60502-2 (ref.) | Low loss material |
| 7 | Hot-set test (cross-linking / XLPE) | 200 °C, 15 min, load 20 N/cm² | PASS | IEC 60811-507 / GB/T 2951 | Elongation / set |
| 8 | Aging in air (thermal endurance) | 135 °C, 7 d (or per Arrhenius) | PASS | IEC 60811-401 / GB/T 2951 | Tensile retained ≥ 80% |
| 9 | Tensile strength (XLPE insulation) | ≥ 12.5 MPa | MPa | IEC 60811 / GB/T 2951 | Before aging |
| 10 | Elongation at break (XLPE insulation) | ≥ 200 % | % | IEC 60811 / GB/T 2951 | Before aging |
| 11 | Cold bend test (insulation) | −15 °C, 4 h, bend radius 5D | No crack | IEC 60811-404 / GB/T 2951 | Applicable to PVC; XLPE no effect |
| 12 | Water absorption (XLPE, type) | ≤ 10 mg / cm² | mg/cm² | IEC 60502-2 (ref.) | Long-term moisture |
| 13 | Dielectric strength (breakdown voltage) | ≥ 20 kV/mm (typical) | kV/mm | Material data | XLPE intrinsic |
| 14 | Conductor DC resistance @ 20 °C | ≤ 0.387 Ω/km | Ω/km | GB/T 3956 / IEC 60228 | Class 2 copper, per core |
| 15 | Short-circuit current rating (1 s, 250 °C) | ≈ 5.00 kA | kA | IEC 60364 / calculated | Per core, reference |
| 5. Electrical Parameters (Derived from Insulation & Conductor) | |||||
| # | Parameter | Value | Unit | Standard / Reference | Remarks |
| 1 | Rated voltage U₀/U | 0.6 / 1 | kV | IEC 60502-1 | Uₘ = 1.2 kV |
| 2 | DC resistance @ 20 °C (per core) | ≤ 0.387 | Ω/km | GB/T 3956 | Class 2 copper |
| 3 | AC resistance @ 90 °C (est., per core) | ≈ 0.503 | Ω/km | Calculated (α = 0.00393/K) | R₂₀ × [1+α(90−20)] |
| 4 | Current rating — in air (30 °C, single circuit) | ≈ 125 – 135 (design ≈ 130) | A | IEC 60287 / GB/T 16895 | 2-core, apply correction |
| 5 | Current rating — direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) | ≈ 155 – 170 (design ≈ 163) | A | IEC 60287 / GB/T 16895 | 2-core, apply correction |
| 6 | Test voltage AC (5 min, routine) | 3.5 | kV | IEC 60502-1 | Routine test |
| 7 | Type-test voltage | 4.0 | kV | IEC 60502-1 | Type test |
| 8 | Frequency | 50 / 60 Hz AC (DC usable) | Hz | — | — |
| 6. Dimensional / Inspection Result | |||||
| # | Item | Design Value | Measured (example) | Tolerance | Verdict |
| 1 | Conductor nominal area (per core) | 50 mm² | 50.0 mm² | ± 0 % (nom.) | OK |
| 2 | Number of wires | 19 | 19 | min. 19 | OK |
| 3 | Wire diameter | Ø1.78 mm | Ø1.77 mm | ± 1 % | OK |
| 4 | Conductor diameter | 9.0 mm | 9.02 mm | ± 2 % | OK |
| 5 | Insulation thickness (nominal) | 1.0 mm | 1.02 mm | −10 % + none | OK |
| 6 | Minimum insulation thickness | 0.80 mm | 0.94 mm | ≥ 0.80 mm | OK |
| 7 | Diameter over insulated core | 11.0 mm | 11.06 mm | ± 5 % | OK |
| 8 | Overall cable diameter | 22.5 – 23.5 (design 23.0) mm | 23.1 mm | ± 5 % | OK |
| 9 | Sheath thickness | 1.8 mm | 1.81 mm | −10 % + none | OK |
| 10 | Approx. weight | 720 – 800 (≈ 760) kg/km | 758 kg/km | ± 5 % | OK |
| Notes | |||||
| 1. All insulation tests shall be carried out at (20 ± 5) °C and 45 – 75 % RH unless otherwise stated. | |||||
| 2. Routine test = 100 % production test; Type test = performed on representative samples; Sample test = per lot. | |||||
| 3. Test voltage 3.5 kV / 5 min is the routine withstand test per IEC 60502-1; 4.0 kV is the type-test voltage. | |||||
| 4. Values marked 'typical' or 'reference' are material / design values; confirm against the manufacturer's test report (TDS / CoC). | |||||
| 5. Current ratings are for a single circuit, unarmoured 2×50 mm²; apply correction factors for grouping, ambient temperature, soil thermal resistivity and depth. | |||||
| 6. XLPE insulation is rated 90 °C long-term / 250 °C short-circuit (≤ 5 s); do not exceed these limits in service. | |||||
| 7. For low-smoke halogen-free requirement → WDZ-YJY 2×50; for fire-survival circuits → NH-ZR-YJV 2×50; for heavy mechanical load → ZR-YJV22 2×50. | |||||
| 8. Standards: GB/T 12706.1-2020 (equiv. IEC 60502-1); GB/T 3956 / IEC 60228; GB/T 19666-2019; GB/T 2951 / IEC 60811; GB/T 3048. | |||||
8. Cross Section Structure
| ZR-YJV 2×50 mm² — Cable Cross-Section Structure (Schematic) | |||||
| Two-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) × 2 | Annealed copper, Class 2 stranded — 10 × 2.52 mm per core (10/2.52), nominal 50 mm² per core | — | ≈ 8.3 (Ø per core) | Current-carrying element; max DC resistance ≤ 0.387 Ω/km @ 20 °C (per core) |
| 2 | Insulation (XLPE) × 2 | Cross-linked polyethylene | 1 | ≈ 10.3 (Ø per core, over insulation) | Dielectric barrier; rated 90 °C continuous; withstands 3.5 kV / 5 min |
| 3 | Core lay-up | Two insulated cores laid up with non-hygroscopic filler; optional binder tape | — | ≈ 20.6 (Ø over lay-up) | Forms a round assembly for sheathing |
| 4 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 1.8 | ≈ 26.2 (Ø overall) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | 26.2 | mm | Mingda unarmored 26.2; armored YJV22 ≈ 28.0 | ||
| Approx. cable weight | ≈ 1194 | kg/km | Mingda 1194 (Al 588.6); armored YJV22 2×50 ≈ 1412 kg/km | ||
| 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 | ||
| Product Structure Introduction — ZR-YJV 2×50 mm² (English) | |||
| Two-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. Purpose & Product Identity | |||
| ZR-YJV 2×50 is a flame-retardant twin-core low-voltage feeder, 0.6/1 kV AC, in the conventional copper / XLPE / PVC family. Manufacture follows GB/T 12706.1 / IEC 60502-1, cores per GB/T 3956 / IEC 60228 and fire class per GB/T 19666 (ZC unless a higher class is ordered). Overall diameter ≈ 26.2 mm, weight ≈ 1194 kg/km, normally supplied in 100 m drums. | |||
| Both cores are symmetrical live conductors intended for single-phase circuits; the product is not rated for flexible duty. | |||
| 2. Conductor Sub-Assembly | |||
| Each core is built from ten soft-drawn copper wires of 2.52 mm (10/2.52), stranded to Class 2 with a nominal 50 mm² section and ≈ 8.3 mm diameter. Per-core DC resistance is held at or below 0.387 Ω/km at 20 °C, keeping 50 mm² in the 226 A air-current class while remaining flexible enough for duct pulling. | |||
| 3. Dielectric Sub-Assembly | |||
| A 1.0 mm XLPE insulation coats every core, bringing the diameter over insulation to ≈ 10.3 mm. The cross-linked dielectric is good for 90 °C continuous running and 250 °C for five seconds on fault, shows volume resistivity of at least 1×10¹² Ω·cm and clears the 3.5 kV / 5 min routine voltage test. | |||
| 4. Core Assembly & Outer Jacket | |||
| The two insulated cores are cabled together with dry, non-hygroscopic fillers (a binder tape is optional), giving a round core assembly of ≈ 20.6 mm. Over this sits a 1.8 mm flame-retarded PVC (ST2) jacket, closing the cable to ≈ 26.2 mm. The ZC flame rating is verified by GB/T 18380.12 and class-C GB/T 18380.35; because the jacket is halogen-bearing PVC, WDZ-YJY should be specified where zero-halogen is mandatory. | |||
| 5. Handling & Application Advice | |||
| • Minimum bending radius 15 × OD; pull with a proper stocking, never on the core. • Post-installation DC test 4U0 = 2.4 kV for 15 minutes. • Ambient −20 to +45 °C, warm before laying below 0 °C. • Ratings are whole-cable values — apply ambient, grouping and burial derating. • Use lugs sized for the ≈ 8.3 mm conductor. |
9. Usage Cautions. Bend ≥ 15 × OD; pull by stocking, never by the cores; avoid kinking; shield from UV and mechanical impact; run the DC site test before energising; load both cores symmetrically; match lugs to the ≈ 8.3 mm core.
10. Application Range. Single-phase feeders, L+N distribution, main sub-boards, pump, HVAC and machine feeders at 0.6/1 kV — conduits, trays, trunking, trenches; indoor or sheltered outdoor.
11. Ordering Information. ZR-YJV 0.6/1 kV 2×50, length, coil/drum type, marking. Standard 100 m; confirm all figures against the factory certificate.
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