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High Voltage Power Cable

NPC Electric High Voltage Power Cable is engineered for reliable transmission of electricity at voltages from 35kV to 500kV. Featuring copper or aluminum conductors, cross-linked polyethylene (XLPE) insulation, metallic screening, and a robust outer sheath, this cable minimizes losses and ensures long-term performance in demanding environments. Designed to meet international standards like IEC 60840 and IEC 62067, it offers excellent electrical properties, mechanical strength, and resistance to moisture, chemicals, and thermal stress. Whether for underground burial, submarine applications, or overhead lines, our High Voltage Power Cable delivers superior efficiency and safety. With low dielectric losses and high breakdown strength, it supports modern power grids, renewable energy integration, and industrial power distribution. Choose our cables for minimal maintenance, extended service life, and compliance with global safety norms.

Standard IEC 60840, IEC 62067

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Construction

Technical Specifications

Quality Control

Application

Construction

High Voltage Power Cable

Conductor

The conductor consists of annealed copper or hard aluminum stranded wires and is classified into three (3) major types of concentric, compacted circular, and segmental compacted circular.

Insulation

The insulation material is extruded cross-linked polyethylene. The conductor screen, the insulation, and the insulation screen mentioned to the following clause are extruded simultaneously in one process to ensure that the screen and insulation are intimately bonded together and free from all possibilities of voids between layers.

Conductor Screen

The conductor screen consists of an extruded semi-conducting polyethylene to minimize electrical stresses due to the stranded configuration of the conductor. The semi-conducting material used for the conductor screen has no deleterious effect on the conductor. Semi-conducting tape is sometimes applied as a separator.

Insulation Screen

The insulation screen is provided over the insulation by extruding the semi-conducting compound concentrically and circularly to minimize the possibility of ionization on the outer surface of the dielectric.

Metallic Screen

The metallic screen consists of the wire shield, the corrugated aluminum sheath, or the lead sheath. The corrugated aluminum sheath and the lead sheath are also adopted where the surface of the duct is poor and where moisture is high.

Outer Sheath

To protect the metallic sheath from electrical or chemical corrosion, it is covered by PE or PVC.

Technical Specifications

High Voltage Power Cable

36/66 (72.5) kV with Aluminum Sheath

36/66 (72.5) kV with Lead Sheath

36/66 (72.5) kV with Copper Wire Shield

64/110 (123) kV with Aluminum Sheath

64/110 (123) kV with Lead Sheath

64/110 (123) kV with Copper Wire Shield

76/132 (145) kV with Aluminum Sheath

76/132 (145) kV with Lead Sheath

76/132 (145) kV with Copper Wire Shield

87/161 (170) kV with Aluminum Sheath

87/161 (170) kV with Lead Sheath

87/161 (170) kV with Copper Wire Shield

127/230 (245) kV with Aluminum Sheath

127/230 (245) kV with Lead Sheath

127/230 (245) kV with Copper Wire Shield

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	524	491	598	671
300	592	556	682	770
400	671	631	781	888
500	762	714	894	1025
630	878	808	1023	1187
800	965	928	1150	1355
1000	1119	1075	1361	1615
1200	1198	1146	1460	1745
1600	1352	1357	1654	2030
2000	1468	1475	1800	2273

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.0	11.0	1.0	1.6	3.5	69	5.5	0.0754	0.20
300		20.4	1.0	11.0	1.0	1.6	3.5	72	6.3	0.0601	0.21
400		23.2	1.0	11.0	1.0	1.7	3.5	75	7.2	0.0470	0.23
500		26.3	1.0	11.0	1.0	1.8	4.0	79	8.6	0.0366	0.25
630		30.2	1.0	11.0	1.0	1.8	4.0	83	10.1	0.0283	0.28
800		34.0	1.0	11.0	1.0	1.9	4.0	87	12	0.0221	0.30
1000	Segment Stranded (Miliken)	38.7	1.0	11.0	1.0	2.0	4.0	92	14.4	0.0176	0.33
1200		41.8	1.0	11.0	1.0	2.1	4.5	98	16.7	0.0151	0.36
1600		48.1	1.0	11.0	1.0	2.2	4.5	105	20.9	0.0113	0.40
2000		54.3	1.0	11.0	1.0	2.4	4.5	112	25.4	0.0090	0.44

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	535	525	621	706
300	606	567	710	810
400	691	646	822	942
500	787	733	951	1098
630	898	833	1096	1274
800	1008	958	1243	1462
1000	1184	1121	1505	1759
1200	1282	1208	1648	1938
1600	1469	1434	1906	2282
2000	1626	1585	2130	2597

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.0	11.0	1.0	2.1	3.5	62	8.1	0.0754	0.20
300		20.4	1.0	11.0	1.0	2.2	3.5	64	9.1	0.0601	0.21
400		23.2	1.0	11.0	1.0	2.3	3.5	67	10.5	0.0470	0.23
500		26.3	1.0	11.0	1.0	2.4	4.0	72	12.5	0.0366	0.25
630		30.2	1.0	11.0	1.0	2.4	4.0	76	14.2	0.0283	0.28
800		34.0	1.0	11.0	1.0	2.6	4.0	80	16.9	0.0221	0.30
1000	Segment Stranded (Miliken)	38.7	1.0	11.0	1.0	2.7	4.0	85	19.9	0.0176	0.33
1200		41.8	1.0	11.0	1.0	2.8	4.5	91	23.0	0.0151	0.36
1600		48.1	1.0	11.0	1.0	3.0	4.5	97	28.0	0.0113	0.40
2000		54.3	1.0	11.0	1.0	3.2	4.5	104	33.4	0.0090	0.44

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	530	483	606	692
300	599	544	693	795
400	683	616	802	925
500	780	729	929	1075
630	886	828	1066	1247
800	997	929	1210	1432
1000	1173	1087	1473	1728
1200	1270	1173	1611	1894
1600	1465	1375	1883	2245
2000	1627	1530	2111	2556

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.0	11.0	1.0	1.2×40	3.5	58	4.4	0.0754	0.20
300		20.4	1.0	11.0	1.0	1.2×40	3.5	60	5.1	0.0601	0.21
400		23.2	1.0	11.0	1.0	1.2×40	3.5	63	5.9	0.0470	0.23
500		26.3	1.0	11.0	1.0	1.2×40	4.0	66	7.2	0.0366	0.25
630		30.2	1.0	11.0	1.0	1.2×40	4.0	71	8.6	0.0283	0.28
800		34.0	1.0	11.0	1.0	1.2×40	4.0	75	10.4	0.0221	0.30
1000	Segment Stranded (Miliken)	38.7	1.0	11.0	1.0	1.2×40	4.0	80	12.7	0.0176	0.33
1200		41.8	1.0	11.0	1.0	1.2×40	4.5	85	14.7	0.0151	0.36
1600		48.1	1.0	11.0	1.0	1.2×40	4.5	91	18.7	0.0113	0.40
2000		54.3	1.0	11.0	1.0	1.2×40	4.5	97	22.7	0.0090	0.44

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	530	483	606	692
300	599	544	693	795
400	683	616	802	925
500	780	729	929	1075
630	886	828	1066	1247
800	997	929	1210	1432
1000	1173	1087	1473	1728
1200	1270	1173	1611	1894
1600	1465	1375	1883	2245
2000	1627	1530	2111	2556

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.0	11.0	1.0	1.2×40	3.5	58	4.4	0.0754	0.20
300		20.4	1.0	11.0	1.0	1.2×40	3.5	60	5.1	0.0601	0.21
400		23.2	1.0	11.0	1.0	1.2×40	3.5	63	5.9	0.0470	0.23
500		26.3	1.0	11.0	1.0	1.2×40	4.0	66	7.2	0.0366	0.25
630		30.2	1.0	11.0	1.0	1.2×40	4.0	71	8.6	0.0283	0.28
800		34.0	1.0	11.0	1.0	1.2×40	4.0	75	10.4	0.0221	0.30
1000	Segment Stranded (Miliken)	38.7	1.0	11.0	1.0	1.2×40	4.0	80	12.7	0.0176	0.33
1200		41.8	1.0	11.0	1.0	1.2×40	4.5	85	14.7	0.0151	0.36
1600		48.1	1.0	11.0	1.0	1.2×40	4.5	91	18.7	0.0113	0.40
2000		54.3	1.0	11.0	1.0	1.2×40	4.5	97	22.7	0.0090	0.44

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	533	498	617	692
300	602	563	705	794
400	687	654	816	923
500	782	744	939	1068
630	891	846	1083	1243
800	1001	949	1229	1425
1000	1176	1108	1468	1718
1200	1269	1235	1612	1871
1600	1455	1415	1870	2206
2000	1609	1562	2087	2505
2500	1695	1647	2201	2642

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.2	14.0	1.0	2.3	3.5	68	9.6	0.0754	0.17
300		20.4	1.2	14.0	1.0	2.4	3.5	71	10.9	0.0601	0.18
400		23.2	1.2	14.0	1.0	2.5	3.5	74	12.3	0.0470	0.20
500		26.3	1.2	14.0	1.0	2.5	4.0	78	13.8	0.0366	0.21
630		30.2	1.2	14.0	1.0	2.6	4.0	82	16.0	0.0283	0.23
800		34.0	1.2	14.0	1.0	2.7	4.0	86	18.5	0.0221	0.25
1000	Segment Stranded (Miliken)	38.7	1.2	14.0	1.0	2.9	4.0	92	21.9	0.0176	0.28
1200		41.8	1.2	14.0	1.0	3.0	4.5	97	24.7	0.0151	0.30
1600		48.1	1.2	14.0	1.0	3.2	4.5	103	30.1	0.0113	0.33
2000		54.3	1.2	14.0	1.0	3.4	4.5	110	35.7	0.0090	0.36
2500		63.0	1.2	14.0	1.0	3.6	4.5	118	42.0	0.0072	0.40

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	528	495	605	682
300	597	559	692	793
400	681	650	800	909
500	775	739	922	1053
630	884	841	1065	1226
800	994	945	1208	1406
1000	1169	1106	1465	1695
1200	1264	1231	1595	1849
1600	1456	1415	1860	2185
2000	1618	1570	2089	2487
2500	1706	1656	2203	2623

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.2	14.0	1.0	1.2×40	3.5	64	5.0	0.0754	0.17
300		20.4	1.2	14.0	1.0	1.2×40	3.5	66	5.7	0.0601	0.18
400		23.2	1.2	14.0	1.0	1.2×40	3.5	69	6.6	0.0470	0.20
500		26.3	1.2	14.0	1.0	1.2×40	4.0	73	7.9	0.0366	0.21
630		30.2	1.2	14.0	1.0	1.2×40	4.0	77	9.4	0.0283	0.23
800		34.0	1.2	14.0	1.0	1.2×40	4.0	81	11.2	0.0221	0.25
1000	Segment Stranded (Miliken)	38.7	1.2	14.0	1.0	1.2×40	4.0	86	13.6	0.0176	0.28
1200		41.8	1.2	14.0	1.0	1.2×40	4.5	91	15.6	0.0151	0.30
1600		48.1	1.2	14.0	1.0	1.2×40	4.5	97	19.6	0.0113	0.33
2000		54.3	1.2	14.0	1.0	1.2×40	4.5	103	23.7	0.0090	0.36
2500		63.0	1.2	14.0	1.0	1.2×40	4.5	111	29.0	0.0072	0.40

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	519	486	589	649
300	585	547	671	742
400	665	635	770	858
500	755	716	883	992
630	856	814	1011	1151
800	956	942	1137	1313
1000	1103	1093	1333	1555
1200	1185	1170	1439	1695
1600	1333	1324	1627	1972
2000	1452	1435	1777	2211
2500	1530	1512	1872	2330

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.5	16.0	1.3	1.8	4.5	83	7.1	0.0754	0.16
300		20.4	1.5	16.0	1.3	1.8	4.5	86	7.9	0.0601	0.17
400		23.2	1.5	16.0	1.3	1.9	4.5	89	8.9	0.0470	0.18
500		26.3	1.5	16.0	1.3	2.0	4.5	92	10.2	0.0366	0.20
630		30.2	1.5	16.0	1.3	2.1	4.5	97	11.9	0.0283	0.21
800		34.0	1.5	16.0	1.3	2.2	4.5	101	14.0	0.0221	0.23
1000	Segment Stranded (Miliken)	38.7	1.5	16.0	1.3	2.2	4.5	106	16.6	0.0176	0.25
1200		41.8	1.5	16.0	1.3	2.3	4.5	110	18.6	0.0151	0.27
1600		48.1	1.5	16.0	1.3	2.4	4.5	116	22.9	0.0113	0.30
2000		54.3	1.5	16.0	1.3	2.6	4.5	124	27.4	0.0090	0.32
2500		63.0	1.5	16.0	1.3	2.8	4.5	131	34.3	0.0072	0.36

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	530	495	612	679
300	600	559	702	781
400	684	636	808	904
500	780	727	934	1050
630	889	840	1077	1222
800	997	941	1222	1400
1000	1170	1100	1469	1681
1200	1264	1226	1599	1842
1600	1449	1404	1853	2168
2000	1600	1548	2064	2460
2500	1686	1631	2175	2592

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.5	16.0	1.3	2.4	4.5	76	11.2	0.0754	0.16
300		20.4	1.5	16.0	1.3	2.5	4.5	78	12.3	0.0601	0.17
400		23.2	1.5	16.0	1.3	2.6	4.5	81	13.8	0.0470	0.18
500		26.3	1.5	16.0	1.3	2.7	4.5	85	15.6	0.0366	0.20
630		30.2	1.5	16.0	1.3	2.7	4.5	88	17.5	0.0283	0.21
800	Segment Stranded (Miliken)	34.0	1.5	16.0	1.3	2.9	4.5	93	20.4	0.0221	0.23
1000		38.7	1.5	16.0	1.3	3.0	4.5	98	23.6	0.0176	0.25
1200		41.8	1.5	16.0	1.3	3.1	4.5	102	26.5	0.0151	0.27
1600		48.1	1.5	16.0	1.3	3.3	4.5	108	31.7	0.0113	0.30
2000		54.3	1.5	16.0	1.3	3.5	4.5	115	37.7	0.0090	0.32
2500		63.0	1.5	16.0	1.3	3.7	4.5	123	44.3	0.0072	0.36

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
240	530	495	612	679
300	600	559	702	781
400	684	636	808	904
500	780	727	934	1050
630	889	840	1077	1222
800	997	941	1222	1400
1000	1170	1100	1469	1681
1200	1264	1226	1599	1842
1600	1449	1404	1853	2168
2000	1600	1548	2064	2460
2500	1686	1631	2175	2592

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
240	Compact Round Stranded	18.1	1.5	16.0	1.3	2.4	4.5	76	11.2	0.0754	0.16
300		20.4	1.5	16.0	1.3	2.5	4.5	78	12.3	0.0601	0.17
400		23.2	1.5	16.0	1.3	2.6	4.5	81	13.8	0.0470	0.18
500		26.3	1.5	16.0	1.3	2.7	4.5	85	15.6	0.0366	0.20
630		30.2	1.5	16.0	1.3	2.7	4.5	88	17.5	0.0283	0.21
800		34.0	1.5	16.0	1.3	2.9	4.5	93	20.4	0.0221	0.23
1000	Segment Stranded (Miliken)	38.7	1.5	16.0	1.3	3.0	4.5	98	23.6	0.0176	0.25
1200		41.8	1.5	16.0	1.3	3.1	4.5	102	26.5	0.0151	0.27
1600		48.1	1.5	16.0	1.3	3.3	4.5	108	31.7	0.0113	0.30
2000		54.3	1.5	16.0	1.3	3.5	4.5	115	37.7	0.0090	0.32
2500		63.0	1.5	16.0	1.3	3.7	4.5	123	44.3	0.0072	0.36

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
300	584	558	669	740
400	664	634	768	855
500	754	718	879	988
630	853	811	1009	1146
800	953	938	1134	1307
1000	1100	1087	1328	1548
1200	1179	1163	1429	1684
1600	1331	1311	1627	1967
2000	1447	1485	1774	2199
2500	1523	1563	1868	2315

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
300	Compact Round Stranded	20.4	1.5	17.0	1.3	1.9	4.5	87	8.4	0.0601	0.16
400		23.2	1.5	17.0	1.3	1.9	4.5	91	9.4	0.0470	0.18
500		26.3	1.5	17.0	1.3	2.0	4.5	94	10.7	0.0366	0.19
630		30.2	1.5	17.0	1.3	2.1	4.5	98	12.3	0.0283	0.21
800		34.0	1.5	17.0	1.3	2.2	4.5	102	14.4	0.0221	0.22
1000	Segment Stranded (Miliken)	38.7	1.5	17.0	1.3	2.3	4.5	108	17.0	0.0176	0.24
1200		41.8	1.5	17.0	1.3	2.3	4.5	111	19.0	0.0151	0.26
1600		48.1	1.5	17.0	1.3	2.5	4.5	119	23.5	0.0113	0.28
2000		54.3	1.5	17.0	1.3	2.6	4.5	125	28.0	0.0090	0.31
2500		63.0	1.5	17.0	1.3	2.8	4.5	134	34.5	0.0072	0.34

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
300	598	557	698	775
400	682	648	805	898
500	777	736	928	1042
630	886	836	1073	1214
800	996	939	1218	1391
1000	1168	1131	1464	1670
1200	1259	1221	1589	1825
1600	1445	1398	1845	2152
2000	1597	1541	2060	2445
2500	1681	1622	2169	2574

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
300	Compact Round Stranded	20.4	1.5	17.0	1.3	2.5	4.5	80	12.5	0.0601	0.16
400		23.2	1.5	17.0	1.3	2.6	4.5	83	14.0	0.0470	0.18
500		26.3	1.5	17.0	1.3	2.7	4.5	86	15.7	0.0366	0.19
630		30.2	1.5	17.0	1.3	2.8	4.5	80	18.0	0.0283	0.21
800		34.0	1.5	17.0	1.3	2.9	4.5	94	20.5	0.0221	0.22
1000	Segment Stranded (Miliken)	38.7	1.5	17.0	1.3	3.0	4.5	100	23.8	0.0176	0.24
1200		41.8	1.5	17.0	1.3	3.2	4.5	103	26.7	0.0151	0.26
1600		48.1	1.5	17.0	1.3	3.4	4.5	110	32.2	0.0113	0.28
2000		54.3	1.5	17.0	1.3	3.6	4.5	116	37.9	0.0090	0.31
2500		63.0	1.5	17.0	1.3	3.7	4.5	124	44.9	0.0072	0.34

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
300	591	553	684	765
400	673	629	789	887
500	766	713	907	1027
630	871	829	1043	1193
800	977	928	1181	1367
1000	1143	1081	1415	1639
1200	1232	1208	1535	1790
1600	1404	1382	1765	2100
2000	1554	1523	1973	2384
2500	1636	1603	2077	2510

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
300	Compact Round Stranded	20.4	1.5	17.0	1.3	1.5×80	4.5	72	6.3	0.0601	0.21
400		23.2	1.5	17.0	1.3	1.5×80	4.5	75	7.2	0.0470	0.23
500		26.3	1.5	17.0	1.3	1.5×80	4.5	79	8.6	0.0366	0.25
630		30.2	1.5	17.0	1.3	1.5×80	4.5	83	10.1	0.0283	0.28
800		34.0	1.5	17.0	1.3	1.5×80	4.5	87	12.0	0.0221	0.30
1000	Segment Stranded (Miliken)	38.7	1.5	17.0	1.3	1.5×80	4.5	92	14.4	0.0176	0.33
1200		41.8	1.5	17.0	1.3	1.5×80	4.5	98	16.7	0.0151	0.36
1600		48.1	1.5	17.0	1.3	1.5×80	4.5	105	20.9	0.0113	0.40
2000		54.3	1.5	17.0	1.3	1.5×80	4.5	112	25.4	0.0090	0.44
2500		63.0	1.5	17.0	1.3	1.5×80	4.5	118	31.1	0.0072	0.34

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
400	657	641	757	836
500	745	725	866	962
630	843	822	989	1111
800	943	916	1116	1268
1000	1090	1057	1310	1505
1200	1165	1131	1403	1631
1600	1316	1322	1596	1902
2000	1438	1440	1758	2143
2500	1512	1514	1849	2254

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
400	Compact Round Stranded	23.2	1.5	23.0	1.3	2.2	4.5	104	11.0	0.0470	0.14
500		26.3	1.5	23.0	1.3	2.3	4.5	108	12.1	0.0366	0.15
630		30.2	1.5	23.0	1.3	2.4	4.5	112	14.2	0.0283	0.17
800		34.0	1.5	23.0	1.3	2.4	4.5	116	15.8	0.0221	0.18
1000		38.7	1.5	23.0	1.3	2.4	4.5	116	15.8	0.0221	0.18
1200	Segment Stranded (Miliken)	41.8	1.5	23.0	1.3	2.6	5.0	126	21.5	0.0151	0.21
1600		48.1	1.5	23.0	1.3	2.7	5.0	133	26.0	0.0113	0.23
2000		54.3	1.5	23.0	1.3	2.8	5.0	139	30.7	0.0090	0.24
2500		63.0	1.5	23.0	1.3	3.0	5.0	148	37.8	0.0072	0.27

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
400	676	638	793	871
500	770	745	914	1010
630	876	847	1054	1173
800	986	950	1196	1343
1000	1153	1108	1429	1606
1200	1243	1194	1552	1757
1600	1424	1401	1797	2068
2000	1571	1545	2004	2342
2500	1652	1625	2108	2463

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
400	Compact Round Stranded	23.2	1.5	23.0	1.3	3.2	4.5	96	17.9	0.0470	0.14
500		26.3	1.5	23.0	1.3	3.3	4.5	100	19.7	0.0366	0.15
630		30.2	1.5	23.0	1.3	3.4	4.5	104	22.1	0.0283	0.17
800		34.0	1.5	23.0	1.3	3.5	4.5	108	24.8	0.0221	0.18
1000	Segment Stranded (Miliken)	38.7	1.5	23.0	1.3	3.6	5.0	114	28.8	0.0176	0.20
1200		41.8	1.5	23.0	1.3	3.9	5.0	118	32.3	0.0151	0.21
1600		48.1	1.5	23.0	1.3	4.1	5.0	124	38.2	0.0113	0.23
2000		54.3	1.5	23.0	1.3	4.2	5.0	130	43.8	0.0090	0.24
2500		63.0	1.5	23.0	1.3	4.4	5.0	148	52.5	0.0072	0.27

Continuous Current Ratings for Single Circuit (A)
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	In Air
Cross-Sectional Area(mm²)	Direct Buried	Pipe Duct	Trefoil	Flat(S=2D)
400	668	634	779	863
500	759	719	895	998
630	864	842	1031	1159
800	970	944	1167	1326
1000	1131	1100	1390	1583
1200	1221	1185	1512	1733
1600	1397	1354	1750	2040
2000	1543	1489	1950	2309
2500	1623	1566	2051	2429

Conductor			Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
Cross-Sectional Area	Shape	Diameter	Thickness of Conductor Screen Approx.	Thickness of Insulation	Thickness of Insulation Screen Approx.	Thickness of Aluminum Sheath	Thickness of Outer Sheath	Outer Diameter of Cable	Weight of Cable	Max. DC Conductor Resistance at 20 °C	Capacitance
mm²		mm	mm	mm	mm	mm	mm	mm	kg/m	Ω/km	μF/km
400	Compact Round Stranded	23.2	1.5	23.0	1.3	1.5×80	4.5	91	10.0	0.0470	0.14
500		26.3	1.5	23.0	1.3	1.5×80	4.5	94	11.2	0.0366	0.15
630		30.2	1.5	23.0	1.3	1.5×80	4.5	98	12.8	0.0283	0.17
800		34.0	1.5	23.0	1.3	1.5×80	4.5	102	14.8	0.0221	0.18
1000	Segment Stranded (Miliken)	38.7	1.5	23.0	1.3	1.5×80	5.0	107	17.2	0.0176	0.20
1200		41.8	1.5	23.0	1.3	1.5×80	5.0	110	19.2	0.0151	0.21
1600		48.1	1.5	23.0	1.3	1.5×80	5.0	116	23.3	0.0113	0.23
2000		54.3	1.5	23.0	1.3	1.5×80	5.0	123	27.6	0.0090	0.24
2500		63.0	1.5	23.0	1.3	1.5×80	5.0	132	33.9	0.0072	0.27

Quality Control

High Voltage Power Cable

Raw Material Test

For our High Voltage Power Cable, raw material testing is critical to ensure quality from the start. The process begins with incoming inspection of conductor materials (copper/aluminum) for purity, conductivity, and tensile strength per ASTM/IEC standards. Insulation compounds like XLPE are tested for density, melt flow index, and contamination using hot set and elongation tests. Semiconducting layers undergo resistivity checks to prevent field stress. Sheath materials are evaluated for abrasion resistance and environmental stress cracking. Samples are subjected to thermal aging, oxidation induction time (OIT), and impurity analysis via microscopy. Partial discharge (PD) inception voltage is measured on extruded samples. All tests follow strict protocols: visual inspection, dimensional verification, chemical composition analysis, and mechanical/electrical property verification.

Process inspection

During the manufacturing of the High Voltage Power Cable, process inspection ensures consistency at every stage. Triple extrusion of conductor shield, XLPE insulation, and insulation shield is monitored for thickness uniformity and concentricity using online X-ray or laser gauges. Curing in dry nitrogen prevents voids, with real-time temperature and pressure control. The metallic screening application is checked for continuity and bonding. The outer sheath extrusion undergoes spark testing for pinholes. In-process partial discharge (PD) monitoring detects defects immediately. Dimensional checks, eccentricity measurements, and surface smoothness inspections occur at key points. Degassing removes by-products post-crosslinking. Sampling for hot set tests verifies the crosslinking degree. The step-by-step flow includes: material feeding verification, extrusion parameter logging, cooling process control, and interim electrical tests.

Finished Product

The finished High Voltage Power Cable undergoes comprehensive testing to validate performance. Routine tests include conductor resistance measurement, high voltage AC withstand (up to 1.7U0), and partial discharge (PD) detection below 5pC per IEC standards. Insulation thickness and sheath integrity are verified. Type tests cover bending, thermal cycling, impulse withstand, and water penetration. Samples undergo tan delta measurement for dielectric losses and heat cycle voltage tests. Shield continuity and jacket spark tests ensure safety. The process steps: preparation with terminations, gradual voltage ramp-up, monitoring for PD/corona, hold at test voltage for specified duration, and post-test inspection. Additional checks include capacitance, elongation, and aging simulations. Only cables passing all criteria are approved, confirming the High Voltage Power Cable's readiness for safe, efficient power transmission in high-demand applications.

Application

High Voltage Power Cable is widely used in national grid interconnections, offshore wind farms, hydroelectric plants, and metropolitan underground networks. It supports heavy industrial loads and long-distance transmission with high efficiency and minimal environmental impact.

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Transport Sector

Real Estate & Construction

Infrastructure & Municipal Industry

Data Centers

Mining and Oil & Gas Industry

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Technical Advantages

● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions

Conductor Stranded Work Shop

CCV Production Line

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Partical Voltage Test Labtoary

Auto-Winding Machine

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Auto-core cutting machine

Basic Insulation Level Test Labtoary

Auto Laser Cutting Machine

Automatic Desanding Machine

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Product Packaging

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Type 450 Flexible Copper Screened Mining Cable With Two Earth And One Pilot Core

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FAQ From Customers

What are the advantages of power cables and overhead lines?

(1) Reliable operation, because it is installed in a hidden place such as underground, it is less damaged by external forces, has less chance of failure, and the power supply is safe, and it will not cause harm to people;
(2) The maintenance workload is small and frequent inspections are not required;
(3) No need to erect towers;
(4) Help improve power factor.

Which aspects should be considered when choosing the cross section of a power cable?

(1) The long-term allowable working current of the cable;
(2) Thermal stability once short circuited;
(3) The voltage drop on the line cannot exceed the allowable working range.

What are the measures for cable fire prevention?

(1) Use flame-retardant cables;
(2) Use fireproof cable tray;
(3) Use fireproof paint;
(4) Fire partition walls and fire baffles are installed at cable tunnels, mezzanine exits, etc.;
(5) Overhead cables should avoid oil pipelines and explosion-proof doors, otherwise local pipes or heat insulation and fire prevention measures should be taken.

What should be paid attention to during the transportation and handling of cables?

(1) During transportation, loading and unloading, cables and cable reels should not be damaged. It is strictly forbidden to push the cable reels directly from the vehicle. Generally, cables should not be transported and stored flat.
(2) Before transporting or rolling the cable reel, ensure that the cable reel is firm, the cable is wound tightly, the oil pipe between the oil-filled cable and the pressure oil tank should be fixed without damage, the pressure oil tank should be firm, and the pressure indication should meet the requirements.

What inspections should be carried out for the acceptance of cable lines?

(1) The cable specifications should meet the regulations, the arrangement should be neat, no damage, and the signs should be complete, correct and clear;
(2) The fixed bending radius of the cable, the related distance and the wiring of the metal sheath of the single-core power cable should meet the requirements;
(3) The cable terminal and the middle head should not leak oil, and the installation should be firm. The oil pressure of the oil-filled cable and the meter setting should meet the requirements;
(4) Good grounding;
(5) The color of the cable terminal is correct, and the metal parts such as the bracket are completely painted;
(6) There should be no debris in the cable trench, tunnel, and bridge, and the cover should be complete.

How many projects can cable engineering be divided into?

(1) Construction site transportation: including the loading and unloading, transportation and empty vehicle return journey of engineering materials from the warehouse to the construction site.
(2) Local engineering: including road excavation, tunnel, trench construction, etc.
(3) Laying engineering: including laying, intermediate head production, lift cover plate, buried pipe, school tide, tractor head production, etc.
(4) Two-end engineering: including the production and installation of support, suspension bridge and its foundation, the production of terminal heads, the installation of oil pressure and signal devices, and the electrical performance testing of various types.
(5) Stopping works: including the production of oil-filled cable stop heads, the installation of fuel supply tanks, automatic drainage and signal devices, etc.
(6) Grounding engineering: including installation of insulation joints, transposition boxes, protectors, and grounding boxes.

What tests and inspections should be carried out on power cables before laying?

Before laying, check whether the type, specification and length of the cable meet the requirements and whether there is external force damage. Low-voltage cables use a 1000V megohmmeter to remotely measure the insulation resistance, and the resistance is generally not less than 10MΩ. High-voltage cables use a 2500V megger to measure the resistance. Generally not less than 400MΩ.

What are the factors that determine the long-term allowable current carrying capacity of the cable?

(1) The long-term allowable working temperature of the cable;
(2) The heat dissipation performance of the cable itself;
(3) The condition of the cable installation and the heat dissipation conditions of the surrounding environment.

According to the difference of insulation and protective layer, what are the main types of commonly used low-voltage power cables?

(1) Oil-impregnated paper insulated lead-clad (or aluminum-clad) power cable;
(2) Non-drip oil-impregnated paper insulated power cable;
(3) PVC insulated and sheathed power cable;
(4) Cross-linked PVC insulated and PE sheathed power cable;
(5) Cross-linked PVC insulated and sheathed power cable;
(6) Rubber insulated power cables.

What are the requirements for the fire blocking of cable holes?

For larger cable penetration holes, such as the cable penetration floor, etc., when using fireproof blocking materials to block, according to the actual situation, first coat four to six layers of fireproof paint on the cable surface, the length is about 1.5m below the hole, and then use fire-resistant The material is processed into a board-supporting fire-proof blocking material with a certain strength to ensure that it is firm after being blocked and is easy to disassemble and assemble when the cable is replaced. The plugging is dense and non-porous to effectively block smoke and fire.

What are the main properties of the insulation material of the power cable?

(1) High breakdown strength;
(2) Low dielectric loss;
(3) Very high insulation resistance;
(4) Excellent discharge resistance;
(5) It has certain flexibility and mechanical strength;
(6) Long-term insulation performance is stable.

What are the regulations for cable protection tubes?

(1) When the cable needs to be laid through a protective pipe, the inner diameter of the pipe should not be less than 1.5 times the outer diameter of the cable, and the inner diameter of the concrete pipe, clay pipe, asbestos, and cement pipe should not be less than 100mm;
(2) The bending radius of the cable tube should meet the requirements of the bending radius of the cable inserted;
(3) Each pipe should not exceed three elbows at most, and there should be no more than two right-angle bends.

How to measure the outer diameter of the cable sheath?

At five evenly distributed points on the circumference of the sheath, measure the outer diameter of the sheath and its average value. The average outer diameter is the outer diameter of the sheath.

How to connect copper core cables with different cross-sections?

Copper core cables with different cross-sections can be connected by open-back weak copper pipes and connected by soldering, or pure copper rods can be connected into copper pipes according to different cross-sectional requirements and connected by crimping.

What are the insulating materials used to make cable terminal heads or intermediate joints?

There are insulating glue, insulating tape, insulating tube, insulating gloves, insulating resin, etc.

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High Voltage Power Cable

Construction

Conductor

Insulation

Conductor Screen

Insulation Screen

Metallic Screen

Outer Sheath

Technical Specifications

Quality Control

Raw Material Test

Process inspection

Finished Product

Application

Technical Advantages

Conductor Stranded Work Shop

CCV Production Line

CCV production 01

Partical Voltage Test Labtoary

Auto-Winding Machine

Oil Chromatography Test Machine

Auto-core cutting machine

Basic Insulation Level Test Labtoary

Auto Laser Cutting Machine

Automatic Desanding Machine

Automatic Dryer Machine

Product Packaging

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