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2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power

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2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power

Model Number : ZR-YJV 2*50mm²

Conductor nominal area (per core) : 50 mm²

Volume resistivity @90 °C : ≥ 10¹² Ω·cm

MOQ : 100 meters

Packaging Details : General Packaging or As Requirements

Conductor diameter (approx.) : 9.0mm

Filler / binder : FR PP filler + FR tape

Routine test : 3.5 kV AC / 5 min; type test 4.0 kV

Short-circuit temp. (≤5 s) : 250 °C

Sheath thickness : 1.8 mm

Supply Ability : 10000 meters per month

Insulation thickness : 1.0 mm (50 mm² class)

Approx. weight : 720 – 800 kg/km,use ≈ 760 kg/km

Emergency overload : 105–130 °C

Certification : CE/ISO/CCC

Number of cores : 2

Brand Name : TONGDU

Conductor (×2) : Bare annealed copper, Class 2 stranded, 19×∅1.78 mm, conductor Ø ≈ 9.0 mm

Place of Origin : China

Conductor construction : Class 2, 19×∅1.78 mm,min. 19 wires

Payment Terms : L/C,T/T

Insulation (×2) : XLPE

Long-term service temp. : 90 °C

Delivery Time : Less than 15 days

Diameter over insulated core : 11.0 mm (9.0 + 2×1.0)

Overall cable diameter : 22.5 – 23.5 mm

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ZR-YJV 2*50mm² Flame Retardant 2 Core Cable, 0.6/1kV Stranded Copper, XLPE Insulation PVC Jacket for Construction Power

Cable Designation & Meaning

Code	Meaning
ZC	Flame retardant C — IEC 60332-3-24, Category C
YJ	Cross-linked polyethylene (XLPE) insulation
V	PVC sheath
2×50 mm²	Two cores, 50 mm² copper conductor each

Construction: Two Class 2 stranded copper conductors, XLPE insulation, PVC outer sheath (no armour, no shield, circular formation).

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).

2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power

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)	—

Insulation & Sheath Data

Property	Value
Insulation material	XLPE (cross-linked polyethylene), Type TR-XLPE
Outer sheath material	PVC (polyvinyl chloride), Type ST₂
Long-term service temp.	90 °C (continuous, XLPE insulation)
Short-circuit temp. (≤5 s)	250 °C (Cu conductor limit for XLPE)
Emergency overload temp.	130 °C (short term, ≤1 h)
Test voltage AC (5 min)	3.5 kV (routine test, 0.6/1 kV class)
Dielectric strength	≥ 20 kV/mm (room temp.)
Volume resistivity @20 °C	≥ 1×10¹⁴ Ω·cm
Shield	None (unshielded design)

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.

2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power

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.

2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power

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.

2 X 50mm2 2 Core Shielded Cable Pvc Jacket Wire For Construction Power

ZC-YJV 2×50 mm² Power Cable

Frequently Asked Questions (FAQ)

Flame-Retardant Class C · XLPE Insulated · PVC Sheathed · Copper Conductor · 0.6/1 kV

Product Basics

Q1. What does the model “ZC-YJV” mean?

“Z” stands for flame-retardant, “C” denotes Class C flame-retardant performance, “YJ” means XLPE (cross-linked polyethylene) insulation, and “V” means PVC sheath. ZC-YJV is a copper-core, Class C flame-retardant, XLPE-insulated, PVC-sheathed low-voltage power cable.

Q2. What does “2×50 mm²” indicate?

“2” means the cable has two cores (two insulated conductors within a common sheath). “50 mm²” is the nominal cross-sectional area of each copper conductor. This 2-core size is commonly used for single-phase main branch feeders and moderate-to-high current single-phase load connections in commercial and industrial installations.

Q3. What is the rated voltage?

The rated voltage U₀/U is 0.6/1 kV (0.6 kV phase-to-earth, 1 kV phase-to-phase), designed for low-voltage power distribution systems.

Q4. What materials are used in construction?

Conductor: plain copper, Class 2 stranded. Insulation: cross-linked polyethylene (XLPE) on each core. Filler: non-hygroscopic material. Outer sheath: flame-retardant PVC. Standard ZC-YJV is unarmored. For direct burial or mechanical protection needs, armored variants such as ZC-YJV22 (double steel tape armor) are available.

Technical Specifications

Q5. What is the maximum operating temperature?

The maximum continuous conductor temperature is 90 °C. During short-circuit events, the conductor may reach up to 250 °C for no more than 5 seconds. XLPE insulation provides excellent thermal stability and high current-carrying capacity for power distribution applications.

Q6. What is the typical current-carrying capacity?

For a 2×50 mm² copper XLPE cable, the ampacity is approximately 145–180 A when installed in free air at 30 °C ambient. Multi-core cables have slightly lower ampacity than equivalent single-core cables due to mutual heating between cores. Lower ratings apply when buried, installed in conduit, grouped, or at elevated ambient temperatures. Refer to GB/T 16895 / IEC 60364 and manufacturer ampacity tables for precise engineering values.

Q7. What is the conductor DC resistance?

The maximum DC resistance of a 50 mm² Class 2 copper conductor at 20 °C is approximately 0.387 Φ/km (annealed copper), per GB/T 3956 / IEC 60228. Each core in the 2-core cable has the same resistance value. Confirm the exact value from the factory test report for each batch.

Installation & Applications

Q8. What is the minimum bending radius?

For multi-core unarmored cables, the minimum bending radius is 15 times the cable outer diameter (15D) during installation. Multi-core cables are generally more flexible than single-core cables of equivalent conductor cross-section. D = actual outer diameter.

Q9. What are the typical applications?

Common uses include: single-phase main branch circuits in commercial and residential buildings; power supply to medium-to-large motors, compressors, and HVAC systems; distribution board outgoing feeders for single-phase load groups; and secondary power distribution in industrial facilities where Class C flame-retardant performance is required.

Q10. Which standards and certifications apply?

Manufactured in accordance with GB/T 12706 (equivalent to IEC 60502), with conductor compliance to GB/T 3956 / IEC 60228 and flame-retardant testing per GB/T 18380 / IEC 60332-3. Common certifications include CCC (China), CE (Europe), ISO 9001, RoHS, and VDE/TUV for specific international markets.

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