ZC-YJV 4x50mm² Class C Flame Retardant XLPE Copper Power Cable for Building Distribution
Product Summary
Product Details
4 Cores Cable
,4 Cores Cable
,Copper Power Cable
Product Description
ZC-YJV 4x50mm² Class C Flame Retardant XLPE Copper Power Cable for Building Distribution
Cable Designation & Meaning
|
Code |
Meaning |
|---|---|
|
ZC |
Flame retardant Category C (GB/T 18380.3) |
|
YJ |
XLPE (cross-linked polyethylene) insulation |
|
V |
PVC outer sheath |
|
4×50 mm² |
Four cores, each 50 mm² copper (3 phases + 1 neutral, no separate earth) |
Construction: XLPE insulated, copper conductor, PVC sheathed, flame-retardant Category C, four-core low-voltage power cable.
ZC-YJV 4×50 mm² (C-class flame-retardant XLPE/PVC LV power cable) — Specification & Engineering Data
1. Overview & Ratings. ZC-YJV 4×50 — flame-retarding four-core LV power cable, four 50 mm² compacted Cu Class 2 conductors, XLPE insulation (90 °C), PVC outer sheath (ST2, black), rated 0.6/1 kV (Um = 1.2 kV), 50 Hz; built and proof-tested per GB/T 12706.1 / IEC 60502-1, stranding per GB/T 3956, ZC fire class per GB/T 19666. Ø ≈ 28.5 mm, ≈ 2380 kg/km, 100 m wooden drums.
2. Construction Stack (Conductor → Outer Sheath).
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductors (×4) | Compacted stranded Cu, Class 2, 7 × 3.0 mm each | — | ≈ 9.5 mm each |
| XLPE insulation (×4) | Cross-linked polyethylene, 90 °C rated | 1.4 mm | ≈ 12.3 mm each |
| Bedding / filler | PVC bedding + binder tape | — | ≈ 25.5 mm |
| Outer sheath | PVC, ST2, flame-retardant, black | 2.0 mm | ≈ 28.5 mm (finished) |
3. Electrical Characteristics. R ≤ 0.387 Ω/km at 20 °C per core; routine test 3.5 kV AC / 5 min; insulation resistance ≥ 3.67 MΩ·km; XLPE volume resistivity ≥ 1×10¹² Ω·cm; capacitance ≤ 0.45 μF/km. Reference ampacity (4 cores loaded) ≈ 175 A air / ≈ 185 A buried at 30 °C.
Electrical Parameters
|
Parameter |
Value |
Note |
|---|---|---|
|
Rated voltage U₀/U |
0.6 / 1 kV |
GB/T 12706.1 / IEC 60502-1 |
|
Max. system voltage Uₘ |
1.2 kV |
— |
|
Test voltage AC (5 min) |
3.5 kV |
Routine |
|
Type-test voltage |
4 kV |
— |
|
DC resistance @20 °C |
≤ 0.387 Ω/km |
GB/T 3956 Class 2 Cu max, 50 mm² |
|
AC resistance @90 °C (est.) |
≈ 0.493 Ω/km |
per core |
|
Capacitance (approx.) |
≈ 0.25 µF/km |
core to core / core to screen |
|
Inductive reactance (approx.) |
≈ 0.08 Ω/km |
at 50 Hz, 4-core |
|
Current rating in air (30 °C) |
165 A |
3-phase loaded, 4-core (3P+1N) |
|
Current rating buried (20 °C) |
140 A |
direct buried, 4-core |
|
Current rating in conduit (30 °C) |
130 A |
3-phase, 4-core |
|
Short-circuit current (1 s, Cu, 250 °C) |
≈ 5.0 kA (5000 A) |
50 mm² Cu |
|
Frequency |
50/60 Hz AC |
— |
Reference values: 50 mm² Cu at 165 A, 3-phase 400 V → max balanced load ≈ 114 kVA. Voltage drop at 165 A ≈ 81.3 V/km per core (≈3.3% per 100 m at 400 V).
Insulation Data
|
Property |
Value |
|---|---|
|
Material |
XLPE (cross-linked polyethylene) |
|
Nominal thickness |
1.0 mm |
|
Long-term service temp. |
90 °C |
|
Short-circuit temp. (≤5 s) |
250 °C (Cu conductor limit per IEC 60228) |
|
Emergency overload temp. |
130 °C |
|
Routine test voltage (AC, 5 min) |
3.5 kV (0.6/1 kV) |
|
Type-test voltage (AC) |
4 kV (0.6/1 kV) |
|
Partial discharge test |
Not required for ≤1.8/3 kV |
|
Tan δ (dissipation factor) |
≤ 0.004 at 20 °C |
4. Thermal & Fire. 90 °C continuous, 250 °C short-circuit (≤ 5 s); -20~+45 °C ambient, ≥ 0 °C laying; ZC per GB/T 19666 — GB/T 18380.35 class-C bunched flame test (char ≤ 2.5 m). PVC sheath is halogen-bearing → WDZ-YJY for LSZH.
Fire Performance (ZC-YJV — Flame Retardant Category C)
|
Property |
Value / Requirement |
|---|---|
|
Flame retardant |
GB/T 18380.3 Category C (ZC) — passes flame propagation test for bundled cables |
|
Halogen content |
Contains halogen (PVC sheath & XLPE insulation) |
|
Smoke density |
Standard (non-low-smoke); optional ZC-YJY for low-smoke zero-halogen |
|
Corrosivity |
Corrosive (PVC) |
|
Fire survival (circuit integrity) |
Not applicable (standard ZC version); use NH-ZC-YJV for circuit integrity |
Flame Retardant Category Comparison:
|
Category |
Test Condition |
Application |
|---|---|---|
|
ZA |
Most stringent (≥80 min burn resistance) |
Critical safety circuits, nuclear, metro |
|
ZB |
High (≥40 min) |
High-rise buildings, data centres |
|
ZC |
Standard (≥20 min) |
Commercial buildings, industrial plants |
|
ZD |
Basic (≥10 min) |
General residential |
5. Installation Practice & Handling. Bend ≥ 15 × OD ≈ 430 mm fixed; DC site test 4U0 = 2.4 kV / 15 min before energising; use Cu compression lugs for 50 mm² terminations; lay in tray, trench, duct, conduit. De-rate 175/185 A for ambient, grouping, burial.
Mechanical & Installation Parameters
|
Parameter |
Value |
Remarks |
|---|---|---|
|
Minimum bending radius |
≥ 15 × OD → ≈ 458 mm at Ø30.5 mm |
static installation |
|
Max. pulling tension |
5000 N |
Cu conductor, use proper pulling grips |
|
Direct burial |
Suitable (with warning tape) |
unarmoured — protect from mechanical damage |
|
Conduit ID |
≥ 1.5 × OD → ≥ 46 mm; use 50 mm, 63 mm or 75 mm |
— |
|
Fixing |
cable clamps, cable ties, tray |
— |
|
Impact resistance |
Low–Moderate |
unarmoured; avoid sharp objects |
|
Water resistance |
Moisture-resistant (PVC sheath) |
not watertight; use armoured or screened for wet |
|
Termination note |
Cu conductors — standard lugs (compression or mechanical) |
strip length 12–15 mm |
6. Typical Service Applications. Main distribution risers, transformer secondaries, industrial feeders, commercial building power, machine tool supply — tray, trench, duct, conduit, trunking; indoor or sheltered outdoor.
7. Testing & QA Regime. Routine: conductor DC resistance ≤ 0.387 Ω/km, 3.5 kV AC / 5 min withstand, dimensional check (XLPE ≥ 1.4 mm, sheath ≥ 2.0 mm, OD ≈ 28.5 mm). Type: heat ageing at 135 °C / 168 h, short-circuit 250 °C / 5 s, heat shock at 150 °C, insulation resistance at 90 °C, ZC bunched flame test GB/T 18380.35 class C.
Cable Parameters
| ZC-YJV 4×50 mm² — Flame-Retardant XLPE-Insulated PVC-Sheathed LV Power Cable — Full Parameter Sheet | ||||
| C-class flame-retardant XLPE-insulated PVC-sheathed power cable · 4 cores × 50 mm² Class 2 stranded Cu · XLPE insulation (90 °C) + PVC outer sheath (ST2) · 0.6/1 kV · GB/T 12706.1 / IEC 60502-1 · finished Ø ≈ 28.5 mm | ||||
| Section | Parameter | Value | Unit | Remarks / Standard |
| 01 · Identification | ||||
| Cable type | ZC-YJV (Flame-retardant C-class XLPE/PVC power cable) | — | Distribution / feeder | |
| Rated voltage (U0/U) | 0.6/1 | kV (Um=1.2 kV) | LV power distribution | |
| Number of cores | 4 × 50 | — | 4 cores, 50 mm² each | |
| Conductor material | Annealed stranded copper | — | Class 2 compacted per GB/T 3956 | |
| Inner insulation material | Cross-linked polyethylene (XLPE) | — | 90 °C rated | |
| Outer sheath material | Polyvinyl chloride (PVC), ST2 | — | Flame-retardant, black | |
| Outer sheath colour | Black | — | Standard | |
| Flame retardancy class | ZC (C-class) | — | Per GB/T 19666 / GB/T 18380.35 | |
| Standard | GB/T 12706.1 / IEC 60502-1 | — | LV power cable | |
| 02 · Conductor (Stranded Copper) | ||||
| Conductor type | Compacted stranded copper | — | Class 2 per GB/T 3956 | |
| Strand construction (per core) | 7 × 3.0 | mm | 7 strands of 3.0 mm (compact) | |
| Conductor diameter (per core) | ≈ 9.5 | mm | Compacted bundle | |
| Cross-sectional area (per core) | 50 | mm² | Nominal | |
| DC resistance @ 20 °C (per core) | ≤ 0.387 | Ω/km | Max per GB/T 3956 Class 2 | |
| Conductor weight per km | ≈ 1780 | kg/km | 4 × 50 mm² Cu | |
| 03 · Insulation & Sheath | ||||
| Inner insulation type | Cross-linked polyethylene (XLPE) | — | 90 °C rated | |
| Inner insulation thickness | 1.4 | mm | Nominal per core | |
| Core colours | Red / yellow / blue (L1/L2/L3) | — 4-core = 3P+N | ||
| Bedding / filler | PVC bedding + binder tape | — | Filler for roundness | |
| Outer sheath type | PVC, ST2 | — | Flame-retardant, black | |
| Outer sheath thickness | 2.0 | mm | Nominal | |
| Finished outer diameter | ≈ 28.5 | mm | 4 cores laid up + sheath | |
| 04 · Electrical | ||||
| Rated voltage (AC) | 0.6/1 | kV | LV power distribution | |
| DC resistance @ 20 °C (per core) | ≤ 0.387 | Ω/km | 50 mm² Cu Class 2 | |
| Insulation resistance | ≥ 3.67 | MΩ·km | XLPE | |
| XLPE volume resistivity | ≥ 1×10¹² | Ω·cm | At 90 °C | |
| Routine test voltage (AC) | 3.5 kV / 5 min | — | Power-frequency withstand | |
| Capacitance | ≤ 0.45 | μF/km | XLPE at 50 Hz | |
| 05 · Thermal & Fire | ||||
| Max continuous conductor temp. | 90 | °C | XLPE rated | |
| Short-circuit temp. | 250 | °C | XLPE limit (≤ 5 s) | |
| Min installation temp. | 0 | °C | XLPE/PVC | |
| Service ambient range | -20 to +45 | °C | LV distribution | |
| Flame retardancy (ZC) | GB/T 18380.35 class C | — | Bunched cable flame test | |
| Halogen-free | No | — | PVC sheath contains halogen | |
| Fire performance | Self-extinguishing | — | ZC = C-class | |
| 06 · Mechanical | ||||
| Min bending radius (fixed) | ≥ 15 × OD ≈ 430 | mm | LV multi-core power | |
| Min bending radius (flexed) | ≥ 20 × OD ≈ 570 | mm | Repeated flexing | |
| Tensile strength (XLPE) | ≥ 12.5 | MPa | XLPE | |
| Abrasion resistance | Good | — | PVC sheath | |
| 07 · Ampacity | ||||
| Air ampacity (4 cores loaded) | ≈ 175 | A | Free air, 30 °C (est.) | |
| Buried ampacity (4 cores) | ≈ 185 | A | Direct burial, 25 °C | |
| Voltage drop (per 100 m @ 175 A) | ≈ 0.68 | V | Per core | |
| 08 · Installation | ||||
| Laying methods | Tray, trench, duct, conduit, indoor/outdoor | — | LV distribution | |
| Connectors | Cu lugs, compression terminals | — | 50 mm² Cu crimp | |
| Polarity | Colour-coded cores | — | Red/yellow/blue = L1/L2/L3, blue=N | |
| Site test (DC) | 4U0 = 2.4 kV / 15 min | — | Before energising | |
| 09 · Packing | ||||
| Standard supply length | 100 m / drum | m | LV power cable | |
| Reel / packing type | Wooden drum | — | Heavy cable | |
| Surface marking | ZC-YJV, 4×50, 0.6/1 kV, GB/T 12706.1, metre marks | — | Continuous printing | |
| Storage conditions | Dry, indoor, 0 to +40 °C | — | Protect from UV / moisture | |
| 10 · Applications | ||||
| Typical use | Main distribution risers, transformer secondaries, industrial feeders, commercial building power, machine tool supply | — | LV power distribution | |
| Max system voltage | 1.2 | kV (Um) | 0.6/1 kV rated | |
| Circuit current rating | Up to 175 | A per circuit | 4 cores loaded | |
Cable Test Parameters
| Test Parameters — ZC-YJV 4×50 mm² | ||||
| No. | Test Item | Test Condition / Method | Requirement | Type |
| 1 | Conductor DC resistance | GB/T 3956, 20 °C, per core | ≤ 0.387 Ω/km (50 mm² Cu Class 2) | Routine |
| 2 | Power-frequency withstand | 3.5 kV AC, 5 min, between cores | No breakdown | Routine |
| 3 | Insulation thickness test | Micrometer | XLPE ≥ 1.4 mm, sheath ≥ 2.0 mm | Routine |
| 4 | Dimensional check | Micrometer | OD ≈ 28.5 mm | Routine |
| 5 | Flame retardancy (ZC) | GB/T 18380.35 class C bunched | Char ≤ 2.5 m, self-extinguishing | Type |
| 6 | Heat ageing | 168 h at 135 °C (XLPE) | No cracking after bend test | Type |
| 7 | Short-circuit test | 250 °C, 5 s | No deformation | Type |
| 8 | Heat shock (XLPE) | 2 h at 150 °C | No cracking | Type |
| 9 | Insulation resistance | At 500 V DC, 90 °C | ≥ 3.67 MΩ·km | Type |
| 10 | Conductor continuity | Per GB/T 3956 | All 4 cores continuous | Routine |
| 11 | Core colour check | Visual | Red/yellow/blue cores | Routine |
| 12 | Bundled flame test | GB/T 18380.35 class C | Vertical bunched flame test | Type |
Cable Cross Section Structure
| ZC-YJV 4×50 mm² — Cross-Section Construction Diagram (Schematic) | |||||
| LV power cable build-up: 4 Cu Class 2 cores (red/yellow/blue) → XLPE insulation → PVC bedding → PVC outer sheath · 0.6/1 kV · ZC C-class flame-retardant · finished Ø ≈ 28.5 mm | |||||
| No. | Layer | Material / Construction | Nominal Thickness (mm) | Diameter (mm) | Function / Remarks |
| 1 | Conductors (×4) | Compacted stranded copper, Class 2, 7 × 3.0 mm per core | — | ≈ 9.5 each | 4 cores; R ≤ 0.387 Ω/km |
| 2 | XLPE insulation (×4) | Cross-linked polyethylene, 90 °C rated | 1.4 | ≈ 12.3 each | XLPE — 90 °C, better than PVC |
| 3 | Bedding / filler | PVC bedding + binder tape | — | ≈ 25.5 | Roundness and mechanical fill |
| 4 | Outer sheath | PVC, ST2, flame-retardant, black | 2.0 | ≈ 28.5 (finished) | ZC C-class flame-retardant |
| Key Dimensions & Properties (expanded) | |||||
| Finished cable diameter | ≈ 28.5 | mm | 4 cores laid up + bedding + sheath | ||
| Approx. cable mass | ≈ 2380 | kg/km | 4 × 50 mm² Cu + XLPE + PVC | ||
| Nominal voltage rating | 0.6/1 | kV | LV power distribution | ||
| Max continuous conductor temp. | 90 | °C | XLPE rated | ||
| Short-circuit temp. (≤5 s) | 250 | °C | XLPE limit | ||
| Min installation temp. | 0 | °C | XLPE/PVC | ||
| Min bending radius (fixed) | ≥ 15 × OD ≈ 430 | mm | LV multi-core power | ||
| DC resistance @ 20 °C (per core) | ≤ 0.387 | Ω/km | 50 mm² Cu Class 2 | ||
| Insulation resistance | ≥ 3.67 | MΩ·km | XLPE | ||
| Routine test voltage (AC) | 3.5 kV / 5 min | — | Power-frequency withstand | ||
| Air ampacity @ 30 °C | ≈ 175 | A | 4 cores loaded (est.) | ||
| Buried ampacity @ 25 °C | ≈ 185 | A | Direct burial | ||
| Flame retardancy (ZC) | GB/T 18380.35 class C | — | Bunched cable flame test | ||
| Halogen-free | No | — | PVC sheath contains halogen | ||
| Schematic — not to exact scale. Finished Ø ≈ 28.5 mm and weight ≈ 2380 kg/km from cross-referenced industry samples; conductor/insulation dimensions per GB/T 12706.1 and GB/T 3956; ampacity 175 A (air) / 185 A (buried) is an engineering estimate for 4 cores loaded. ZC-YJV is the C-class flame-retardant version of YJV — XLPE-insulated (90 °C) PVC-sheathed LV power cable rated 0.6/1 kV for distribution trunking and feeder circuits. Unlike BV (single-core PVC 70 °C building wire), YJV uses XLPE insulation (90 °C), has 4 colour-coded power cores, and is designed for high-current distribution. Values marked (est.) require confirmation against the factory test certificate. | |||||
Construction Description
| Construction Description — ZC-YJV 4×50 mm² (LV power cable) | |||
| Layer-by-layer LV power cable build-up · 4 compacted Cu Class 2 cores (7×3.0) / XLPE insulation (90 °C) / PVC bedding / PVC outer sheath (ST2) · 0.6/1 kV · ZC C-class flame-retardant · finished Ø ≈ 28.5 mm | |||
| 1. Product Identity & Ratings | |||
| ZC-YJV 4×50 is the C-class flame-retardant version of YJV — a flame-retardant XLPE-insulated PVC-sheathed LV power cable rated 0.6/1 kV (Um=1.2 kV) at 50 Hz, built and tested per GB/T 12706.1 / IEC 60502-1. It has 4 colour-coded cores (red/yellow/blue), each 50 mm² compacted stranded copper (Class 2, 7×3.0 mm), insulated with 1.4 mm XLPE (90 °C rated), laid up with PVC bedding, and enclosed in a 2.0 mm PVC outer sheath (ST2, black). Unlike BV (single-core PVC 70 °C building wire), YJV uses XLPE insulation (90 °C), has 4 power cores, and is designed for high-current distribution. Finished Ø ≈ 28.5 mm, mass ≈ 2380 kg/km, supplied on wooden drums in 100 m lengths. | |||
| 2. Compacted Stranded Copper Conductors (4 cores) | |||
| Each of the 4 cores uses 7 strands of 3.0 mm annealed copper wire, compacted to a near-circular bundle (Class 2 per GB/T 3956), giving a maximum DC resistance of 0.387 Ω/km per core at 20 °C. The 4 cores are colour-coded: red (L1), yellow (L2), blue (L3 and N). The compacted conductor reduces the overall cable diameter compared with a non-compacted bundle. Always use Cu compression lugs for 50 mm² terminations. | |||
| 3. XLPE Insulation (90 °C rated) | |||
| Each core is insulated with 1.4 mm of cross-linked polyethylene (XLPE), rated for 90 °C continuous conductor temperature (up to 250 °C for ≤ 5 s short-circuit). XLPE has much better thermal and electrical properties than PVC — it can carry more current for the same cross-section, has higher dielectric strength, and lower insulation resistance. This is the key difference from BV (PVC 70 °C). | |||
| 4. PVC Bedding & Outer Sheath | |||
| The 4 insulated cores are laid up in a triangular formation with PVC bedding and binder tape to ensure roundness. The cable is then enclosed in a 2.0 mm PVC outer sheath (ST2, black), which provides mechanical protection and is flame-retardant to ZC (C-class). The ZC designation means the cable passes the bunched cable flame test (GB/T 18380.35 class C) — char length ≤ 2.5 m. | |||
| 5. Site Handling & Operational Notes | |||
| • Lay in tray, trench, duct, conduit, or indoor/outdoor fixed installations. • Observe the 15 × OD minimum bend radius (≈ 430 mm) for fixed installation. • Service range -20 to +45 °C; conductor up to 90 °C continuous. • Routine test 3.5 kV AC / 5 min between cores. • DC site test 4U0 = 2.4 kV / 15 min before energising. • PVC sheath contains halogen — use WDZ-YJY for LSZH. • At about 2380 kg/km, the cable is supplied on wooden drums. • Use Cu compression lugs for 50 mm² terminations. • ZC = C-class flame-retardant for bunched cable installations. |
8. Standards & Conformity. GB/T 12706.1 / IEC 60502-1 (LV XLPE power cables); GB/T 3956 (Class 2 compacted conductors); GB/T 19666 / GB/T 18380.35 (ZC C-class flame retardancy). Rated 0.6/1 kV LV power distribution.
9. Packaging, Storage & Logistics. 100 m per wooden drum. Continuous marking: ZC-YJV, 4×50, 0.6/1 kV, GB/T 12706.1, supplier identity, production year, metre marks. Store dry, indoor, 0 to +40 °C, protect from UV.
10. Procurement Specification. State "ZC-YJV 0.6/1 kV 4×50" + length/drum + marking; confirm against factory test certificate. Use Cu compression lugs for 50 mm². For LSZH, specify WDZ-YJY 4×50 instead.
11. Cable Industry FAQ.
- Q1: What is the difference between YJV and BV? YJV uses XLPE insulation (90 °C, 0.6/1 kV, multi-core power cable for distribution). BV uses PVC insulation (70 °C, 450/750 V, single-core building wire for conduit). YJV is for high-current power; BV is for low-current building wiring.
- Q2: What does "ZC" mean? ZC = C-class flame-retardant per GB/T 19666 / GB/T 18380.35. The cable passes the bunched vertical flame test at class C (char length ≤ 2.5 m). ZA and ZB are higher classes; ZC is the most common for general LV distribution.
- Q3: Why XLPE instead of PVC? XLPE can run at 90 °C continuous (vs PVC 70 °C), so a 50 mm² XLPE cable carries ~175 A vs ~130 A for PVC. XLPE also has better dielectric strength and lower insulation loss.
- Q4: Can YJV be buried directly? Unarmored YJV should be laid in trench, duct, or conduit. For direct burial, use YJV22 (steel tape armored) or YJV32 (steel wire armored).
- Q5: What is YJV22? YJV22 adds a double steel tape armor layer between the bedding and outer sheath, providing crush protection for direct burial and underground installations.
- Q6: What is the difference between YJV and YJLV? YJV uses copper conductors. YJLV uses aluminum conductors (lighter, cheaper, lower ampacity). For the same cross-section, aluminum has higher resistance.
- Q7: Why is the routine test 3.5 kV and not 2 kV? For 0.6/1 kV cables, the power-frequency withstand test is 3.5 kV (3.5×U0), vs 2.0 kV for 300/500 V control cables. Higher rated voltage requires higher test voltage.
- Q8: Can YJV be used outdoors? YJV's black PVC sheath is UV-resistant enough for sheltered outdoor use, but for long-term direct outdoor exposure, use a UV-stabilized sheath or armored cable.
- Q9: What size lugs do I need for 50 mm²? Use 50 mm² copper compression lugs (Cu tubular terminals), crimped with a hydraulic crimper. Always inspect crimp quality.
- Q10: What is the minimum bending radius? 15 × OD for fixed installation (≈ 430 mm for 28.5 mm cable), 20 × OD for flexible installation. This is much larger than BV (4×OD) because YJV is a large multi-core power cable.
- Q11: How do I choose between YJV and RVV? RVV is 300/500 V control/lamp cable (PVC, 70 °C, small cross-sections). YJV is 0.6/1 kV power distribution cable (XLPE, 90 °C, large cross-sections for high current). Different voltage and current ranges.
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