Class 2 25mm2 2 Cores Cable Flame Retardant Copper Cable Xlpe Insulation Pvc Sheath
Class 2 25mm2 2 Cores Cable Flame Retardant Copper Cable Xlpe Insulation Pvc Sheath
Product Summary
ZR-YJV 2*25mm² Flame Retardant Copper Cable,0.6/1kV XLPE Insulation PVC Sheath for Power Distribution Code Mean:ZR-Flame Retardant,YJ-XLPE Insulation,V-PVC Outer Sheathed. ZR-YJV 2×25 mm² — Product Data Review 1. Product Summary. ZR-YJV 2×25 is a two-core flame-retardant power cable — twin 25 mm² ...
Product Details
Highlight:
Class 2 2 Core Cable
,25mm 2 core cable Flame Retardant
,Power Distribution pvc cable sheath
Conductor (×2):
Bare Annealed Copper, Class 2 Stranded, 7×∅2.14 Mm, Conductor Ø ≈ 6.4 Mm
Conductor nominal area:
25 Mm²
Number of cores:
2
Conductor construction:
Class 2, 7×∅2.14 Mm,min. 7 Wires
Conductor diameter (approx.):
6.4mm
Insulation (×2):
XLPE,
Insulation thickness:
0.9 Mm (25 Mm² Class)
Diameter over insulated core:
8.2 Mm (6.4 + 2×0.9)
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)
Overall cable diameter:
19.0 – 19.8 Mm Use 19.4 Mm For Design
Approx. weight:
480 – 540 Kg/km Use ≈ 510 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*25mm² Flame Retardant Copper Cable,0.6/1kV XLPE Insulation PVC Sheath for Power Distribution
Code Mean:ZR-Flame Retardant,YJ-XLPE Insulation,V-PVC Outer Sheathed.
ZR-YJV 2×25 mm² — Product Data Review
1. Product Summary. ZR-YJV 2×25 is a two-core flame-retardant power cable — twin 25 mm² copper conductors, XLPE insulation, PVC sheath, rated 0.6/1 kV (Um = 1.2 kV), 50 Hz. It complies with GB/T 12706.1 / IEC 60502-1, GB/T 3956 / IEC 60228 (core) and GB/T 19666 / GB/T 18380 (fire, default ZC).
2. Construction Overview. Core-to-jacket stack:
| Layer | Build | Wall | Diameter |
|---|---|---|---|
| Conductor (×2) | Annealed copper, Class 2, 7 × 2.14 mm (7/2.14) each, 25 mm² per core | — | ≈ 6.4 mm per core |
| Insulation (×2) | Cross-linked polyethylene | 0.9 mm | ≈ 8.2 mm per core (over ins.) |
| Lay-up | Two cores + non-hygroscopic filler, optional binder tape | — | ≈ 16.4 mm |
| Sheath | Flame-retarded PVC, ST2, black | 1.8 mm | ≈ 20.0 mm overall |
Weight ≈ 659 kg/km (Al version ≈ 329).
3. Electrical Ratings. DC resistance ≤ 0.727 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) ≈ 150 A in air (30 °C) and ≈ 191 A direct-buried (20 °C) per Chengtantai; Mingda's armored YJV22 table quotes 128 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) |
≤ 0.727 Ω/km |
GB/T 3956 max |
|
AC resistance @90 °C (est.) |
≈ 0.945 Ω/km |
per core |
|
Current rating in air (30 °C, single circuit, 2-core) |
≈ 90 – 100 A |
design ≈ 95 A |
|
Direct buried (20 °C, soil 1.0 K·m/W, 0.7 m) |
≈ 115 – 125 A |
design ≈ 120 A |
|
Short-circuit current (1 s, Cu, 250 °C, per core) |
≈ 2.50 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 2×25 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 2×25 | — | 2 cores × 25 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; safety: CCC / production licence |
| 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, both cores live (phase + neutral / L + N applications) |
| 7 | Identification | Nominal cross-sectional area | 25 | 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) | 7 wires × 2.14 mm (7/2.14) | — | Class 2 round stranded; nominal section 25 mm² per core |
| 11 | Conductor | Conductor diameter (per core) | ≈ 6.4 | mm | Ø of the 7/2.14 stranded core (6.0–6.4 mm across practice) |
| 12 | Conductor | Max. DC resistance of conductor at 20 °C | 0.727 | Ω/km | GB/T 3956, Class 2 copper; acceptance criterion for 25 mm² |
| 13 | Insulation | Material | Cross-linked polyethylene (XLPE) | — | Thermally cross-linked; natural/transparent colour |
| 14 | Insulation | Nominal insulation thickness | 0.9 | mm | GB/T 12706.1 / IEC 60502-1 (0.6/1 kV, 25 mm²) |
| 15 | Insulation | Diameter over insulation (per core) | ≈ 8.2 | mm | ≈ 6.4 + 2 × 0.9 (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 (ahtk & Mingda tables agree) |
| 19 | Dimensions | Approx. overall diameter | 20.0 | mm | ≈ 20.0 mm (ahtk 20.0; Chengtantai 19.8) |
| 20 | Dimensions | Approx. cable weight | ≈ 659 | kg/km | ahtk 659 (aluminium version ≈ 329 kg/km); armored YJV22 2×25 ≈ 863 kg/km |
| C. Electrical Performance | |||||
| 21 | Electrical | Max. DC conductor resistance at 20 °C | 0.727 | 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; varies with geometry and manufacturer test method |
| 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 | ≈ 150 | A | Chengtantai two-core table (150 A Cu); applies to the cable as a whole; Mingda armored YJV22 quotes 128 A @25 °C — derate per GB/T 16895 / IEC 60364 |
| 27 | Electrical | Reference ampacity — direct burial, 20 °C | ≈ 191 | A | Chengtantai two-core table (191 A Cu); depends on soil thermal resistivity and depth |
| 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 Qifan 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 (Chengtantai lists 15 × OD = 297 mm); 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. 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 - ZR-YJV 0.6/1 kV 2x25 mm² - Flame-Retardant (FR) Characteristics | ||||
| Cable Designation: ZR (Flame Retardant, Class C) | YJ (XLPE Insulation) | V (PVC Sheath) | 2x25 mm² (2 cores x 25 mm² Cu) | ||||
| 1. Cable Identification | ||||
| Code | Meaning | Standard / Reference | Notes | |
| ZR | Legacy prefix for flame retardant (Class C) | GB/T 19666-2019 | Modern equivalent: ZC | |
| YJ | XLPE (cross-linked polyethylene) insulation | GB/T 12706.1-2020 (IEC 60502-1) | Long-term 90 °C | |
| V | PVC outer sheath (flame-retardant grade, contains halogen Cl) | GB/T 19666-2019 | Not low-smoke | |
| 0.6/1 kV | Rated voltage U₀/U = 600/1000 V; Uₘ = 1.2 kV | IEC 60502-1 | — | |
| 2x25 mm² | Two cores, nominal copper conductor area 25 mm² per core | GB/T 3956 (IEC 60228) | Class 2 stranded | |
| 2. Flame-Retardant (FR) & Fire Performance Characteristics | ||||
| Property | Value / Requirement | Test Standard | Class / Grade | Remarks |
| Flame retardant class | Class C (bundled combustion) | GB/T 19666-2019 | Class C | Legacy ZR defaults to C |
| Bunched flame test | Char length ≤ 2.5 m | GB/T 18380.3 (IEC 60332-3) | Class C | Cable bundle test |
| Single flame test | Self-extinguishing | IEC 60332-1 | Pass | Flame spread limited |
| Halogen content | Contains chlorine (Cl) - PVC sheath | GB/T 17650 (IEC 60754) | Halogenated | Produces HCl gas |
| Smoke density | Heavy dark smoke (not low-smoke) | GB/T 17651 (IEC 61034) | Not LS | LSZH option: WDZ-YJY |
| Gas corrosivity | Corrosive HCl gas released | GB/T 17650 (IEC 60754) | Corrosive | pH / conductivity not certified |
| Acid gas emission | High (HCl) | IEC 60754-1 / -2 | — | Not for enclosed spaces |
| Oxygen index (LOI) | ≥ 30 % (typical for FR-PVC) | GB/T 2406 (IEC 4589) | ≥ 30 % | Reference value |
| Max. conductor temp. (normal) | 90 °C | IEC 60502-1 | — | XLPE insulation |
| Max. short-circuit temp. (≤5 s) | 250 °C | IEC 60502-1 | — | Cu conductor |
| Emergency overload temp. | 105 - 130 °C | IEC 60502-1 | — | Short duration |
| Min. installation temp. | 0 °C (pre-heat below 0 °C) | Manufacturer spec. | — | Ambient |
| 3. Fire Test Summary (ZR = Class C) | ||||
| Test Item | Requirement | Result (Typical) | Verdict | Alternative (if required) |
| Bunched flame propagation | Char ≤ 2.5 m @ Class C | Char ≈ 1.8 m | Pass | — |
| Single vertical flame | No flame spread after removal | Self-extinguishing | Pass | — |
| Smoke opacity (light transmittance) | Not low-smoke (PVC) | Heavy smoke | N/A | WDZ-YJY (LS) |
| Halogen / acid gas | Cl present (PVC) | HCl released | N/A | WDZ-YJY (HFFR) |
| Fire survival (circuit integrity) | Not certified | — | Fail / N/A | NH-ZR-YJV (NH = fire-resistant) |
| 4. Key Electrical & Thermal Parameters (Reference) | ||||
| Parameter | Value | Unit | Standard | Notes |
| Rated voltage U₀/U | 0.6 / 1 | kV | IEC 60502-1 | Uₘ = 1.2 kV |
| DC resistance @ 20 °C (per core) | ≤ 0.727 | Ω/km | GB/T 3956 | Class 2 Cu |
| AC resistance @ 90 °C (est.) | ≈ 0.945 | Ω/km | — | Per core |
| Test voltage AC (5 min, routine) | 3.5 | kV | IEC 60502-1 | Routine test |
| Type-test voltage | 4.0 | kV | IEC 60502-1 | Type test |
| Current rating - in air (30 °C) | ≈ 95 | A | Design value | Single circuit, 2-core |
| Current rating - buried (20 °C) | ≈ 120 | A | Design value | Soil 1.0 K·m/W, 0.7 m |
| 5. Construction & Material (Impact on FR Performance) | ||||
| Layer (inside -> outside) | Description | Material / Spec. | Flame Retardant? | Thickness |
| Conductor (x2) | Bare annealed copper, Class 2 stranded | 7xØ2.14 mm, IEC 60228 | No | — |
| Insulation (x2) | XLPE, colours red/black/blue | 90 °C, 0.9 mm nom. | Yes (XLPE) | 0.9 mm |
| Filler | Flame-retardant filler to form round assembly | FR PP / PE | Yes | — |
| Binder | Flame-retardant tape over laid-up cores | FR tape | Yes | — |
| Outer sheath | Flame-retardant PVC (ZR grade), black | FR-PVC, black | Yes (FR-PVC, Class C) | 1.8 mm |
| Armour / Screen | None | — | — | — |
| 6. Selection Guide (When FR Requirement Matters) | ||||
| Requirement | Recommended Cable | Why | Smoke | Halogen |
| Standard flame retardant (this cable) | ZR-YJV 2x25 | Class C FR-PVC | Heavy | Yes (Cl) |
| Low-smoke halogen-free | WDZ-YJY 2x25 | LSZH sheath, low smoke | Low | No |
| Fire survival (circuit integrity) | NH-ZR-YJV 2x25 | Mica tape for fire resistance | Heavy | Yes (Cl) |
| Heavy mechanical load / burial | ZR-YJV22 2x25 | Steel tape armour | Heavy | Yes (Cl) |
| Notes: (1) ZR is a legacy designation; under GB/T 19666-2019 it defaults to Flame Retardant Class C (modern equivalent ZC). (2) PVC-sheathed (V) cables contain halogen (Cl) and produce corrosive HCl gas with heavy smoke when burned - not suitable for enclosed or populated areas; use WDZ-YJY for LSZH. (3) Values are typical/reference; confirm with manufacturer's test reports before specification. (4) HS Code (China): 8544.4921. | ||||
6. Verification. Routine: resistance, 3.5 kV/5 min, dimension audit (ins. ≥ 0.9 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).
| ZR-YJV 2×25 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) | ≤ 0.727 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 ≥ 0.9 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; 7 × 2.14 mm; Ø ≈ 6.4 mm | Sampled per batch |
| Type test | Single-cable vertical flame-spread test (flame retardance) | GB/T 18380.12 | No flame spread; charring does not reach top reference point | ZR / ZC flame-retardant property |
| Type test | Bunched flame-spread test, class C | GB/T 18380.35 | Char extent ≤ 2.5 m above burner bottom edge; flame application 20 min; non-metallic volume ≥ 1.5 L/m | Class ZC per GB/T 19666 |
| Type test | Bending test (mechanical) | GB/T 12706.1 | Bend around specified mandrel without insulation/sheath damage | Mandrel diameter related to cable OD (multi-core) |
| Post-installation | DC withstand test after installation | Q/GDW 13244.1-2018 (recommended practice) | 4U0 = 2.4 kV DC, 15 min, no breakdown | For new installations; verify project specification |
| Optional | Insulation resistance measurement at 20 °C | Manufacturer test method | ≥ 36.7 MΩ·km (typical finished-cable value) | Not a routine item in GB/T 12706.1; confirm with factory |
| Optional | XLPE volume resistivity at 20 °C | Manufacturer / material test | ≥ 1 × 10¹² Ω·cm | Material-level reference |
7. Usage Cautions. Bend ≥ 15 × OD; avoid kinks and drag over sharp edges; shield from UV; run the DC site test before energising; load both cores symmetrically; choose lugs sized for the ≈ 6.4 mm core.
8.Cross Section Structure
| ZR-YJV 2×25 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 — 7 × 2.14 mm per core (7/2.14), nominal 25 mm² per core | — | ≈ 6.4 (Ø per core) | Current-carrying element; max DC resistance ≤ 0.727 Ω/km @ 20 °C (per core) |
| 2 | Insulation (XLPE) × 2 | Cross-linked polyethylene | 0.9 | ≈ 8.2 (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 | — | ≈ 16.4 (Ø over lay-up) | Forms a round assembly for sheathing |
| 4 | Outer sheath (PVC) | Flame-retardant PVC, ST2 type, black | 1.8 | ≈ 20.0 (Ø overall) | Mechanical & moisture protection; flame retardance ZC (ZR) per GB/T 19666 |
| Key Dimensions & Properties | |||||
| Overall diameter | 20.0 | mm | ahtk 20.0; Chengtantai 19.8 | ||
| Approx. cable weight | ≈ 659 | kg/km | ahtk 659 (Al 329); armored YJV22 2×25 ≈ 863 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 2×25 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. Document Introduction | |||
| This document introduces ZR-YJV 2×25, a flame-retardant two-core low-voltage power cable rated 0.6/1 kV AC and built on the CU / XLPE / PVC formula. The product follows GB/T 12706.1 / IEC 60502-1, GB/T 3956 / IEC 60228 for conductors and GB/T 19666 (default ZC) for flame retardance. Outer diameter about 20.0 mm, mass ≈ 659 kg/km, delivered in 100 m coils or on drums. | |||
| Both cores are identical and live; the cable is designed for fixed wiring and should not be handled as a flexible lead. | |||
| 2. Conductor Construction | |||
| Each core is formed by stranding seven annealed copper wires of 2.14 mm (7/2.14) to Class 2, giving 25 mm² per core at a diameter of ≈ 6.4 mm. The per-core DC resistance is limited to 0.727 Ω/km at 20 °C. This size balances capacity and bendability, making the bundle straightforward to pull into conduits and trunking. | |||
| 3. Insulation Construction | |||
| Every core is covered by a 0.9 mm XLPE layer, bringing the diameter over insulation to ≈ 8.2 mm. The cross-linked dielectric is rated for 90 °C continuous operation and 250 °C for five seconds under short-circuit, with volume resistivity ≥ 1×10¹² Ω·cm and a production routine of 3.5 kV AC for five minutes. | |||
| 4. Assembly & Sheathing | |||
| The two insulated cores are twisted together with non-hygroscopic filler (optionally held by binder tape) into a round bundle of ≈ 16.4 mm. A 1.8 mm flame-retardant PVC (ST2) sheath over the bundle completes the cable at ≈ 20.0 mm. The ZC rating is proven by GB/T 18380.12 (single burn) and GB/T 18380.35 (class C, char ≤ 2.5 m); PVC carries halogen, so WDZ-YJY is the zero-halogen alternative. | |||
| 5. Field Handling Notes | |||
| • Keep bends at or above 15 × OD for multi-core routes. • After installation run the DC 4U0 = 2.4 kV / 15 min site test. • Ambient −20 to +45 °C; warm the coil below 0 °C. • Ampacity is quoted per cable — apply grouping and burial derating. • Confirm the actual core Ø (≈ 6.4 mm) before selecting lugs and glands. |
9. Application Range. Single-phase feeders, L+N distribution, small sub-boards, pump and HVAC circuits, control supplies at 0.6/1 kV — conduits, trays, trunking, trenches; indoor or sheltered outdoor.
10. Ordering Information. ZR-YJV 0.6/1 kV 2×25, length, coil/drum type, marking. Standard 100 m; confirm all figures against the factory certificate.
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