WDZBN-YJY 5 Core 3x50mm²+2x25mm² Low Smoke Halogen Free Fire Resistant XLPE Cable 0.6/1kV
Product Summary
Product Details
xlpe 5 core cable
,xlpe copper conductor cable
,black 5 core cable
Product Description
WDZBN-YJY 5 Core 3x50mm²+2x25mm² Low Smoke Halogen Free Fire Resistant XLPE Cable 0.6/1kV
Cable Designation & Meaning
|
Code |
Meaning |
|---|---|
|
0.6/1 kV |
Rated voltage: U₀ = 0.6 kV (phase-to-earth), U = 1 kV (phase-to-phase) |
|
WD |
Low-smoke, zero-halogen (LSZH) |
|
ZB |
Flame retardant Category B (IEC 60332-3-23, Class B) |
|
N |
Fire-resistant (circuit integrity under fire, mica tape) |
|
YJ |
XLPE (cross-linked polyethylene) insulation |
|
Y |
LSZH outer sheath |
|
3×50 mm² |
Three phase cores, each 50 mm² copper |
|
+2×25 mm² |
Two additional cores, each 25 mm² copper (typically 1×N + 1×PE) |
Construction: Copper conductors with mica tape fire barrier, XLPE insulation, LSZH sheath, 5-core unarmoured power cable with combined low-smoke zero-halogen + flame retardant B + fire-resistant properties.
WDZBN-YJY 3×50+2×25 mm² — LV LSZH Fire-Resistant Power Cable — Specification & Engineering Data
1. Overview & Ratings. WDZBN-YJY 3×50+2×25 is a 5-core (3P+N+PE) low-voltage LSZH fire-resistant power cable rated 0.6/1 kV (Um = 1.2 kV), 90 °C continuous. Built per GB/T 12701 / IEC 60502-1, ZB flame retardant per GB/T 19666, N fire-resistant per GB/T 19216. No steel armor — designed for tray and conduit in life-safety circuits. Finished OD ≈ 35 mm, ≈ 2600 kg/km, 200 m drums.
2. Construction Stack (Conductor → Outer).
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Phase conductors (×3) | Compacted stranded Cu, Class 2, 3×50 mm² | — | ≈ 8.6 mm each |
| N/PE conductors (×2) | Compacted stranded Cu, Class 2, 2×25 mm² | — | ≈ 6.6 mm each |
| Fire-resistant mica tape | Mica tape wrapped per core | ≈ 0.14 mm | — |
| XLPE insulation | Cross-linked polyethylene | 1.3 (phase) / 1.2 (N) | 11.2 / 8.8 mm |
| Filler + binder | PP filler + non-woven tape | — | ≈ 31 mm |
| LSZH outer sheath | Low smoke zero halogen, off-white | ≈ 1.8 mm | ≈ 35 mm |
3. Electrical Characteristics. Phase DC resistance ≤ 0.387 Ω/km; N/PE resistance ≤ 0.741 Ω/km at 20 °C. Routine test 3.5 kV AC / 5 min; insulation resistance ≥ 36.7 MΩ·km. Nominal ampacity ≈ 165 A (air, 25 °C). Circuit integrity maintained ≥ 90 min at 750 °C under fire conditions.
Insulation Data
|
Property |
Value |
|---|---|
|
Material |
XLPE (cross-linked polyethylene) |
|
Nominal thickness |
1.0 mm (0.6/1 kV class) |
|
Long-term service temp. |
90 °C |
|
Short-circuit temp. (≤5 s) |
250 °C (Cu conductor limit) |
|
Emergency overload temp. |
130 °C |
|
Routine test voltage (AC, 5 min) |
3.5 kV (for 0.6/1 kV) |
|
Type-test voltage (AC) |
4.0 kV (for 0.6/1 kV) |
|
Partial discharge test |
≤ 10 pC at 1.73 U₀ (1.04 kV) |
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 test |
|
DC resistance @20 °C (50 mm²) |
≤ 0.387 Ω/km |
GB/T 3956 Class 2 Cu max |
|
DC resistance @20 °C (25 mm²) |
≤ 0.727 Ω/km |
GB/T 3956 Class 2 Cu max |
|
AC resistance @90 °C (est., 50 mm²) |
≈ 0.493 Ω/km |
per phase core |
|
AC resistance @90 °C (est., 25 mm²) |
≈ 0.926 Ω/km |
N/PE core |
|
Capacitance (approx.) |
≈ 0.25 µF/km |
core to sheath |
|
Inductive reactance (approx.) |
≈ 0.08 Ω/km |
at 50 Hz, 5-core unarmoured |
|
Current rating in air (30 °C) |
165 A |
3-phase loaded, 3×50 mm² (derated for 5-core) |
|
Current rating buried (20 °C) |
145 A |
direct buried |
|
Current rating in conduit (30 °C) |
140 A |
3-phase, 5-core |
|
Short-circuit current (1 s, Cu, 250 °C, 50 mm²) |
≈ 5.0 kA (5000 A) |
per phase core |
|
Short-circuit current (1 s, Cu, 250 °C, 25 mm²) |
≈ 2.5 kA (2500 A) |
per N/PE core |
|
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 phase core (≈3.3% per 100 m at 400 V).
4. Thermal & Fire. 90 °C continuous; 250 °C short-circuit (≤ 5 s). ZB flame retardant (Class B) per GB/T 19666. N fire-resistant per GB/T 19216 — circuit integrity ≥ 90 min at 750 °C. LSZH sheath produces low, transparent smoke and zero halogen acid gas in fire.
Temperature Characteristics
|
Property |
Value |
|---|---|
|
Max. conductor operating temp. |
90 °C (continuous) |
|
Max. short-circuit temp. (≤5 s) |
250 °C (Cu conductor) |
|
Emergency overload temp. |
130 °C |
|
Min. installation ambient temp. |
−20 °C (LSZH sheath, flexible at low temp) |
|
Service ambient range |
−20 °C to +90 °C (with LSZH sheath) |
|
Fire survival |
GB/T 19216 / IEC 60331 — circuit integrity ≥ 90 min at 750–800 °C (Category N, fire-resistant) |
Fire Performance (WDZBN-YJY — Combined LSZH + Flame Retardant B + Fire Resistant)
|
Property |
Value / Requirement |
|---|---|
|
Flame retardant |
IEC 60332-3-23 Category B (bunched cable test, flame propagation ≤ 1.5 m) |
|
Halogen content |
Zero (IEC 60754, LSZH) |
|
Smoke density |
Low smoke (IEC 61034, light transmittance ≥ 60%) |
|
Corrosivity |
Non-corrosive (IEC 60754, pH ≥ 4.3) |
|
Toxicity |
Low toxicity (IEC 60754, HCN emission ≤ 5 mg/g) |
|
Fire survival (circuit integrity) |
GB/T 19216 / IEC 60331 — ≥ 90 min at 750–800 °C (mica tape fire barrier) |
|
Heat release |
Low (LSZH material) |
Combined Classification Summary:
|
Feature |
Code |
Standard |
Result |
|---|---|---|---|
|
Low-smoke |
WD |
IEC 61034 |
✅ Pass (transmittance ≥ 60%) |
|
Zero-halogen |
WD |
IEC 60754 |
✅ Pass (halogen-free) |
|
Flame retardant B |
ZB |
IEC 60332-3-23 |
✅ Pass (propagation ≤ 1.5 m) |
|
Fire resistant |
N |
IEC 60331 / GB/T 19216 |
✅ Pass (≥ 90 min at 750–800 °C) |
5. Installation Practice & Handling. Bend ≥ 12 × OD ≈ 420 mm. Tray, conduit, indoor — not for direct burial (no armor). Site DC test 2.4 kV / 15 min before energizing. LSZH sheath is less crush-resistant than PVC. At 2600 kg/km, moderate weight. Store away from UV exposure.
Mechanical & Installation Parameters
|
Parameter |
Value |
Remarks |
|---|---|---|
|
Minimum bending radius |
≥ 12 × OD → ≈ 384 mm at Ø32 mm |
unarmoured, flexible |
|
Max. pulling tension |
5000 N (phase), 2500 N (N/PE) |
Cu conductor |
|
Direct burial |
Good (LSZH sheath, use sand bedding) |
not watertight; use water-blocking for submerged |
|
Conduit ID |
≥ 1.5 × OD → ≥ 48 mm; use 50 mm or 63 mm |
— |
|
Fixing |
cable ties, clamps, tray |
— |
|
Impact resistance |
Moderate (unarmoured, LSZH sheath) |
protect with conduit in exposed areas |
|
Water resistance |
Moisture-resistant (LSZH) |
not waterproof |
|
UV resistance |
Good (LSZH, outdoor rated) |
— |
|
Termination note |
Cu conductors + mica tape — strip mica tape at termination point; use standard compression lugs |
mica tape must be removed for electrical contact |
6. Typical Service Applications. Fire alarm systems, emergency lighting, smoke extraction fans, public building risers, tunnels, high-rises, hospitals — where low smoke, halogen-free, and circuit integrity during fire are critical for human evacuation.
7. Testing & QA Regime. Routine: conductor DC resistance, 3.5 kV AC withstand, insulation resistance, dimensional check. Type: fire resistance test (750 °C, 90 min), flame retardancy Class B, smoke density (IEC 61034), halogen acid gas (IEC 60754), XLPE heating test.
Cable Parameters
| WDZBN-YJY 3×50+2×25 mm² — LV LSZH Fire-Resistant Power Cable — Full Parameter Sheet | ||||
| 5-core (3+2) non-armored · Cu / XLPE + fire-resistant mica / LSZH sheath · 0.6/1 kV · B-class flame retardant · low smoke zero halogen · ≈ 35 mm | ||||
| Section | Parameter | Value | Unit | Remarks / Standard |
| 01 · Identification | ||||
| Cable type | WDZBN-YJY — LSZH fire-resistant XLPE power cable | — | Non-armored | |
| Rated voltage (U0/U) | 0.6/1 | kV | LV distribution | |
| Number of cores | 3 × 50 + 2 × 25 | — | 3P + N + PE | |
| Conductor material | Annealed copper, compacted stranded | — | Class 2 | |
| Insulation material | XLPE + fire-resistant mica tape | — | N = fire resistant | |
| Sheath material | LSZH (low smoke zero halogen) | — | Halogen-free | |
| Flame retardant | ZB (Class B) | — | GB/T 19666 | |
| Fire resistance | N (fire-resistant) | — | Circuit integrity | |
| Standard | GB/T 12701 / IEC 60502-1 | — | LV power | |
| 02 · Conductor (Cu) | ||||
| Conductor type | Compacted stranded annealed copper | — | Class 2 | |
| Phase conductor area | 3 × 50 | mm² | L1/L2/L3 | |
| Neutral/earth area | 2 × 25 | mm² | N + PE | |
| Phase stranding | ≈ 19 × 1.78 mm | — | 50 mm² | |
| N/PE stranding | ≈ 7 × 2.21 mm | — | 25 mm² | |
| DC resistance (phase) @ 20 °C | ≤ 0.387 | Ω/km | Cu 50 mm² | |
| DC resistance (N/PE) @ 20 °C | ≤ 0.741 | Ω/km | Cu 25 mm² | |
| Conductor weight per km | ≈ 1050 | kg/km | 5-core Cu | |
| 03 · Insulation | ||||
| Fire-resistant layer | Mica tape wrapped | ≈ 0.14 | mm | |
| Insulation type | XLPE (cross-linked polyethylene) | — | Thermoset | |
| Phase insulation thickness | ≈ 1.3 | mm | 50 mm² | |
| N/PE insulation thickness | ≈ 1.2 | mm | 25 mm² | |
| Phase core OD | ≈ 11.2 | mm | Insulated | |
| N/PE core OD | ≈ 8.8 | mm | Insulated | |
| 04 · Sheath | ||||
| Sheath type | LSZH (low smoke zero halogen) | — | Halogen-free | |
| Sheath thickness | ≈ 1.8 | mm | LV | |
| Finished outer diameter | ≈ 35 | mm | Overall | |
| Sheath color | Off-white / orange | — | LSZH standard | |
| Halogen content | Zero (halogen-free) | — | WD = low smoke | |
| 05 · Electrical | ||||
| Rated voltage (U0/U) | 0.6/1 | kV | LV | |
| Max voltage | 1.2 | kV | Um | |
| DC resistance (phase) @ 20 °C | ≤ 0.387 | Ω/km | Cu 50 | |
| Test voltage (AC) | 3.5 kV / 5 min | — | Routine | |
| Insulation resistance | ≥ 36.7 | MΩ·km | XLPE | |
| Nominal current (ampacity) | ≈ 165 | A | Air, 25 °C | |
| Circuit integrity (fire) | ≥ 90 min @ 750 °C | — | N-rated | |
| 06 · Thermal & Fire | ||||
| Max conductor temp. | 90 | °C | XLPE continuous | |
| Short-circuit temp. | 250 | °C | Max 5 s | |
| Fire resistance | ≥ 90 min @ 750 °C | — | GB/T 19216 | |
| Flame retardancy | ZB (Class B) | — | GB/T 19666 | |
| Smoke density | Low (LSZH) | — | Transparent smoke | |
| Halogen acid gas | Zero | — | Halogen-free | |
| 07 · Mechanical | ||||
| Min bending radius (fixed) | ≥ 12 × OD ≈ 420 | mm | Non-armored | |
| Crush resistance | Moderate | — | Non-armored | |
| Weight per km | ≈ 2600 | kg/km | 5-core LSZH | |
| 08 · Installation | ||||
| Laying methods | Tray, conduit, indoor, cable basket | — | Non-armored | |
| Bending radius | ≥ 12 × OD ≈ 420 mm | — | Non-armored | |
| Site test | 4U0 = 2.4 kV DC / 15 min | — | Before energizing | |
| Connectors | Cu lugs for 50 / 25 mm² | — | Compression | |
| 09 · Packing | ||||
| Standard supply length | 200 m / drum | m | Non-armored | |
| Reel / packing type | Wooden drum | — | Export standard | |
| Surface marking | WDZBN-YJY, 3×50+2×25, 0.6/1kV, GB/T 12701 | — | Continuous printing | |
| Storage conditions | Dry, indoor | — | Protect from UV | |
| 10 · Applications | ||||
| Typical use | Fire systems, emergency lighting, public buildings, high-rise risers | — | Life safety | |
| Application level | Low voltage | — | 0.6/1 kV | |
| Installation type | Indoor / tray / conduit | — | Non-armored | |
Cable Test Parameters
| Test Parameters — WDZBN-YJY 3×50+2×25 mm² LSZH Fire-Resistant Cable | ||||
| No. | Test Item | Test Condition / Method | Requirement | Type |
| 1 | Conductor DC resistance | GB/T 3956, 20 °C | ≤ 0.387 Ω/km (50); ≤ 0.741 Ω/km (25) | Routine |
| 2 | Voltage test (AC) | 3.5 kV AC, 5 min | No breakdown | Routine |
| 3 | Insulation resistance | 5000 V DC | ≥ 36.7 MΩ·km | Routine |
| 4 | Fire resistance test | GB/T 19216, 750 °C, 90 min | Circuit integrity maintained | Type |
| 5 | Flame retardancy | GB/T 19666 Class B | ZB certified | Type |
| 6 | Smoke density test | IEC 61034 | Low smoke, transparent | Type |
| 7 | Halogen acid gas | IEC 60754 | Zero halogen content | Type |
| 8 | Dimensional check | Caliper | OD ≈ 35 mm | Routine |
| 9 | XLPE heating test | 90 °C conductor, 4 h | No damage | Type |
| 10 | Bending test | 12× OD, cycles | No damage | Type |
| 11 | Mica tape check | Visual / thickness | Fire layer intact | Routine |
| 12 | Printing legibility | Visual | Marking readable | Routine |
Cable Cross Section Structure
| WDZBN-YJY 3×50+2×25 mm² — Cross-Section Construction Diagram (Schematic) | |||||
| 5-core (3+2) non-armored: Cu → fire-resistant mica → XLPE insulation → filler → LSZH sheath · 0.6/1 kV · ≈ 35 mm | |||||
| No. | Layer | Material / Construction | Nominal Thickness (mm) | Diameter (mm) | Function / Remarks |
| 1 | Phase conductors (×3) | Compacted stranded Cu, Class 2, 3×50 mm² | — | ≈ 8.6 each | R ≤ 0.387 Ω/km |
| 2 | N/PE conductors (×2) | Compacted stranded Cu, Class 2, 2×25 mm² | — | ≈ 6.6 each | R ≤ 0.741 Ω/km |
| 3 | Fire-resistant mica tape | Mica tape wrapped over each core | ≈ 0.14 | — | N = fire resistant |
| 4 | XLPE insulation | Cross-linked polyethylene | 1.3 (phase) / 1.2 (N) | 11.2 / 8.8 | 90 °C rated |
| 5 | Filler + binder tape | PP filler + non-woven tape | — | ≈ 31 | Round out the core |
| 6 | LSZH outer sheath | Low smoke zero halogen, off-white | ≈ 1.8 | ≈ 35 | Halogen-free |
| Key Dimensions & Properties (expanded) | |||||
| Finished cable diameter | ≈ 35 | mm | Overall | ||
| Approx. cable mass | ≈ 2600 | kg/km | 5-core LSZH | ||
| Nominal voltage rating | 0.6/1 | kV | LV distribution | ||
| Max conductor temp. | 90 | °C | XLPE continuous | ||
| Short-circuit temp. | 250 | °C | Max 5 s | ||
| Min bending radius (fixed) | ≥ 12 × OD ≈ 420 | mm | Non-armored | ||
| DC resistance (phase) @ 20 °C | ≤ 0.387 | Ω/km | Cu 50 mm² | ||
| DC resistance (N/PE) @ 20 °C | ≤ 0.741 | Ω/km | Cu 25 mm² | ||
| Test voltage (AC) | 3.5 kV / 5 min | — | Routine | ||
| Nominal current (ampacity) | ≈ 165 | A | Air, 25 °C | ||
| Fire resistance | ≥ 90 min @ 750 °C | — | N-rated | ||
| Flame retardancy | ZB (Class B) | — | GB/T 19666 | ||
| Halogen content | Zero | — | LSZH | ||
| Standard | GB/T 12701 / IEC 60502-1 | — | LV power | ||
| Schematic — not to exact scale. Finished OD ≈ 35 mm and weight ≈ 2600 kg/km from cross-referenced industry samples. WDZBN-YJY is a 5-core (3P+N+PE) LSZH fire-resistant non-armored LV power cable for life-safety circuits. Values marked (est.) require confirmation against the factory test certificate. | |||||
Construction Description
| Construction Description — WDZBN-YJY 3×50+2×25 mm² LSZH fire-resistant cable | |||
| Layer-by-layer LSZH fire-resistant: Cu / mica fire layer / XLPE insulation / filler / LSZH sheath · 0.6/1 kV · 90 °C · ≈ 35 mm | |||
| 1. Product Identity & Ratings | |||
| WDZBN-YJY 3×50+2×25 is a 5-core (3P+N+PE) low-voltage LSZH fire-resistant power cable rated 0.6/1 kV, 90 °C. Built per GB/T 12701, ZB flame retardant and N fire-resistant per GB/T 19666/19216. Designed for life-safety circuits where low smoke and halogen-free performance is critical. Finished OD ≈ 35 mm, mass ≈ 2600 kg/km, 200 m drums. | |||
| 2. Five Copper Conductors (3+2) | |||
| Three 50 mm² phase conductors (compact stranded Cu, ~19×1.78 mm) plus two 25 mm² conductors for N and PE (~7×2.21 mm). Phase resistance ≤ 0.387 Ω/km; N/PE resistance ≤ 0.741 Ω/km at 20 °C. | |||
| 3. Fire-Resistant Mica + XLPE Insulation | |||
| Each core is first wrapped with mica tape (~0.14 mm) for circuit integrity during fire, then extruded with XLPE (1.3 mm phase / 1.2 mm N). The mica layer maintains circuit integrity for ≥ 90 min at 750 °C. | |||
| 4. LSZH Outer Sheath | |||
| The outer sheath is made of low-smoke zero-halogen (LSZH) compound, ~1.8 mm thick. Unlike PVC, LSZH emits no halogen acid gas and produces low, transparent smoke in a fire — critical for human evacuation in tunnels, high-rises, and public buildings. | |||
| 5. Site Handling & Operational Notes | |||
| • Bend radius 12×OD (≈ 420 mm). • Tray, conduit, indoor. • Site DC test 2.4 kV / 15 min. • LSZH sheath is less crush-resistant than PVC — avoid direct burial. • At 2600 kg/km, moderate. • Store away from UV. |
8. Standards & Conformity. GB/T 12701 (LV power cables); IEC 60502-1; GB/T 3956 (conductors); GB/T 19666 (ZB flame retardant); GB/T 19216 (fire-resistant circuit integrity); IEC 61034 (smoke density); IEC 60754 (halogen gas).
9. Packaging, Storage & Logistics. 200 m per wooden drum. Continuous marking: WDZBN-YJY, 3×50+2×25, 0.6/1kV, GB/T 12701. Store indoors, dry, away from direct sunlight.
10. Procurement Specification. State "WDZBN-YJY 0.6/1 kV 3×50+2×25" + drum length. Confirm fire-resistance and LSZH certificates against factory test records.
11. Cable Industry FAQ.
- Q1: What does "WDZBN" mean? W = low smoke (低烟); D = halogen-free (无卤); Z = flame retardant (阻燃); B = Class B (B 级); N = fire resistant (耐火). It combines LSZH, B-class flame retardancy, and fire-resistant circuit integrity.
- Q2: What is the difference between WDZBN-YJY and ZC-YJV22? ZC-YJV22 has a PVC sheath and steel tape armor for direct burial. WDZBN-YJY has an LSZH sheath and no armor for tray/conduit in life-safety areas. WDZBN-YJY emits no toxic halogen gas in fire; ZC-YJV22's PVC does.
- Q3: Why is there no armor? WDZBN-YJY is designed for indoor tray and conduit installation where mechanical protection is provided by the cable tray itself. Armor adds weight and cost and is unnecessary in these protected environments.
- Q4: What is the mica tape layer for? The mica tape wrapped under the XLPE insulation maintains circuit integrity during fire. Even if the XLPE burns away, the mica layer keeps the circuit live for ≥ 90 minutes at 750 °C — critical for emergency lighting and fire pumps.
- Q5: What is LSZH? Low Smoke Zero Halogen. In a fire, LSZH emits much less smoke than PVC, and the smoke is transparent (improving visibility for evacuation). It contains no halogen, so no toxic acid gas is released.
- Q6: Can this be directly buried? No — without steel armor, the LSZH sheath is vulnerable to crush and rodent damage. Use ZC-YJV22 (armored) for direct burial.
- Q7: What is the ampacity? Approximately 165 A in free air at 25 °C. The smaller 50 mm² conductors give lower ampacity than the 185 mm² ZC-YJV22 (370 A).
- Q8: What is the bending radius? 12×OD ≈ 420 mm — more flexible than armored cable but still requires generous bends.
- Q9: Where must this cable be used? Building codes often require LSZH fire-resistant cables in: tunnels, underground stations, high-rise evacuation routes, hospitals, schools, and public assembly buildings.
- Q10: How long does it maintain circuit integrity in a fire? ≥ 90 minutes at 750 °C per GB/T 19216. This allows enough time for evacuation and emergency services.
- Q11: Can WDZBN-YJY replace regular YJV? Yes, but it costs more. Use it in life-safety circuits and enclosed spaces where smoke toxicity is a concern. For ordinary power distribution, standard YJV is sufficient.
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