Products Description

Water sitting in an underground cable trench will destroy standard 15kV insulation given enough time. Moisture works its way inward, starts treeing in the XLPE layer, and eventually trips your main breaker. We built this single-core 15kV copper line to stop that exact failure chain. It combines triple-extruded insulation with a swellable water-blocking tape under the outer jacket, making it reliable for flooded ducts and wet soil condition without breakdown.

Quick Specs

Rated Voltage	AC 8.7/15kV
Conductor	1×240 mm² stranded copper (36/2.94 construction)
Insulation	Triple-extruded XLPE
Shielding & Waterproofing	Copper wire braid + copper tape + swellable water-blocking tape
Sheath & Temps	Black PVC/ST2 \| -15°C to 90°C
Bending Radius	≥15× cable O.D.
Standards	IEC 60502-2, IEC 60228, IEC 60811

Field Notes & Engineering Context

Single-core copper for heavy 15kV feeds

Big power transfer needs low resistance. Plain logic. A single 240 mm² copper core carries high continuous current with minimal voltage loss. Plus, three-core 15kV cables are stiff and hard to manage. Single-core lines bend much easier through tight conduit elbows, so your installation crew spends less time fighting the spool during long duct pulls.

Water-blocking tape mechanism

Outer jackets get nicked during backfilling. It happens. When groundwater leaks through a cut PVC sheath, this specialized tape layer expands instantly into a thick gel. That swell seals the gap completely, stopping moisture from traveling down the metallic shield toward your cable terminations.

Triple extrusion is non-negotiable at 15kV

Electrical stress inside a 15kV line is high. If you extrude the semi-con shields and XLPE insulation in separate passes, micro air pockets get trapped between layers. Those tiny voids trigger partial discharge over time. We extrude all three layers together in one single step, eliminating air gaps so the insulation holds up over decades of thermal expansion.

Dual copper shield design

We wrapped helical copper wires over the core and backed them with spiraled copper tape. This composite shield keeps the radial electric field balanced around the conductor while giving short-circuit fault currents a clear, low-resistance exit path to ground.

Typical Installation Sites

Underground conduit banks and wet cable trenches in 15kV municipal grids. Main power supply lines inside data centers, chemical plants, and heavy manufacturing sites. Underground collector circuits linking solar field combiners to main substation transformers.

Application

product-1200-800

Certificate

ISO Quality Management System Certificate

IEC 60502-1:2020, EN IEC 61000-6-1:2019,

EN IEC 61000-6-3:2021

certificate 05

1.Construction
S/N	Construction		Requirement
1	Conductor		2 Class 2 Copper Conductor
2	Insulation		+XLPE+Conductor shield, XLPE insulation and insulation shield triple extrusion
3	Metal shield		+Copper wire shield + copper tape spiral shield
4	Sheath		PVC/ST2
2. Cable identification Core identification: Single Core: Natural Black 3. Standard compliance IEC 60502-2, IEC 60228, IEC 60811
4.Application
S/N	Item				Technical requirement
1	Rated voltage				AC 8.7/15kV
2	Operating temperature				'-15~90℃
3	Allowed bending radius for laying				≥15 times the outer diameter of the cable
S/N	No. of cores × sectional area	Structure of conductor	Approx. dia. of conductor	Nominal thk. of insulation	Nominal thk.of sheath	Approx. OD of cable	Approx. weight of cable
	no.× sqmm	no./mm	mm	mm	mm	mm	kg/km
1	1×240	36/2.94	18.6	4.5	2.1	38.2	3444
5. Electrical characteristics
S/N	No. of cores × sectional area ×		Max. DC resistance of conductor@20℃ 20℃			Voltage withstand test
	no.× sqmm		Ω/km			kV/min,no breakdown
1	1×240		0.0754			30.5/5

Huayu MV Underground Cable Benefit

Built for industrial site and utility underground medium voltage power transmission circuits
Multi-core copper conductors resist harsh outdoor and coastal air conditions
Solid insulation performs well in damp, salt-spray and oily areas
Heavy-duty outer sheath copes with underground moisture and chemical splashes
Integrated SWA steel wire armour for direct-burial mechanical protection
LSZH / flame-retardant grades available to meet local power rules
Every lot gets full electrical tests before shipment