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Three Core Medium Voltage Power Cable to IEC 60502 2

Three Core Medium Voltage Power Cable to IEC 60502 3

Three Core Medium Voltage Power Cable to IEC 60502

Three Core Medium Voltage Power Cable to IEC 60502 are designed for the distribution of electrical power with nominal voltage Uo/U ranging from 1.8/3KV to 26/35 kV and frequency 50Hz. They are suitable for installation mostly in power supply stations, indoors and in cable ducts, outdoors, underground, and in water, as well as for installation on cable trays for industries, switchboards, and power stations.

Standard IEC 60502 Part 1(1.8/3KV) IEC 60502 Part 2(3.6/6KV to 18/30KV)

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Construction

Technical Specifications

Quality Control

Application

Construction

Three Core Medium Voltage Power Cable to IEC 60502

Conductor

Plain annealed copper or aluminum complying with IEC 60228 class 1 or 2.

Insulation

Insulation is of polyvinyl chloride (PVC) intended for 1.8/3.6 kV and 3.6/6 kV Power Cable, cross-linked polyethylene compound (XLPE) or ethylene propylene rubber (EPR/HEPR).

Conductor Screen

The conductor screen consists of an extruded layer of nonmetallic, semi-conducting compound applied on top of a semi-conducting tape. The conductor screen is applied under triple extrusion process over the conductor along with the insulation and the insulation screen. The extruded semi-conducting compound is firmly bonded to the insulation to exclude all air voids and can be easily hand stripped on site. The conductor screen is not necessary for both PVC and EPR/HEPR insulated 1.8/3.6KV and 3.6/6KV Power Cable.

Insulation Screen

The insulation screen consists of an extruded layer of nonmetallic, semi-conducting compound extruded over the insulation of each core. The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound capable of removal for jointing or terminating. As an option, a semi-conducting tape may be applied over the individual cores or core assembly as a bedding for the metallic layer. The minimum thickness is 0.3 mm and the maximum resistivity is 500 Ohm-m at 90°C. The screen is tightly fitted to the insulation to exclude all air voids and can be easily hand stripped on site. The insulation screen is not necessary for both PVC and EPR/HEPR insulated 1.8/3.6KV and 3.6/6KV Power Cable. The screen may be covered by semi-conductive water blocking swellable tape to ensure longitudinal watertightness.

Metallic Layer

The metallic layer may be applied over the individual cores or the core assembly collectively.
The following types of metallic layers are provided:
1) Metallic Screen
2) Concentric Conductor
3) Metallic Sheath
4) Metallic Armor

Inner Covering & Fillers

For Power Cable with a collective metallic layer or Power Cable with a metallic layer over each individual core with additional collective metallic layers, semi-conducting inner covering and fillers shall be applied over the laid-up cores. The inner covering and fillers are made of nonhygroscopic material like polypropylene, except if the cable is to be made longitudinally watertight. The inner covering is extruded in general, but may be lapped if the interstices between the cores are filled. The approximate thickness of extruded inner coverings is given.

Separation Sheath (for armored cable)

The separation sheath comprises a layer of extruded PVC, PE or LSZH applied over the laid up cores under the armor. PVC is normally of grade ST2 and PE of grade ST7. The nominal thickness is calculated by 0.02Du + 0.6mm where Du is the fictitious diameter under the sheath in mm. For Power Cable without a lead sheath, the nominal separation sheath thickness shall not be less than 1.2mm. For Power Cable where the separation sheath is applied over the lead sheath, the nominal separation sheath thickness shall not be less than 1.0mm.

Lapped Bedding (for armored lead sheathed cable)

The lapped bedding applied to the lead sheath consists of either impregnated/synthetic compounded paper tapes or a combination of two layers of these paper tapes followed by a few layers of compounded fabulous materials. The thickness is around 1.5mm.

Armour (for armored cable)

The armor is applied over the inner covering helically. It consists of either flat galvanized steel wire armor (strip), round galvanized steel wire armor, or double steel tape armor. The armor up to and including 15mm, flat wire armor will not be used. The tape armor is applied helically in two layers so that the outer tape is approximately central over the gap of the inner tape. If tape armor is used, the inner covering shall be reinforced by taped bedding.

Over Sheath

Overall sheath comprises a layer of extruded either thermoplastic compound (PVC ST3 type or PE ST7 type or LSZH) or elastomeric compound (polychlorprene CSP or chlorosulfonated PE). The nominal over sheath thickness is calculated by 0.035D+1 where D is the fictitious diameter immediately under the over sheath in mm. For unarmored Power Cable and Power Cable with the over sheath not applied over the armor, metallic screen or concentric conductor, the nominal over sheath thickness shall not be less than 1.4mm. And for Power Cable with over sheath applied over the armor, metallic screen or concentric conductor, the nominal over sheath thickness shall not be less than 1.8mm.

Technical Specifications

Three Core Medium Voltage Power Cable to IEC 60502

Three Core 3.6/6KV(Um=7.2KV)

Three Core 6/10KV(Um=12KV)

Three Core 8.7/15KV(Um=17.5KV)

Three Core 12/20KV(Um=24KV)

Three Core 18/30KV(Um=36KV)

Three Core 21/35KV(Um=42KV)

Three Core 26/35KV(Um=42KV)

Three Core 1.8/3KV(Um=7.2)KV to 26/35KV(Um=42KV) XLPE Insulation

Three Core 1.8/3KV(Um=7.2)KV to 26/35KV(Um=42KV) EPR Insulation

Nom. Cross - Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area	Unarmoured Cables				Steel Round-Wire Armoured Cables
				Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
				Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm²	mm	mm	kg/km		mm	mm	mm	mm	kg/km
10	2.5	0.1	16	2	30	980	790	1.2	2	2.1	36	2310	2120
16	2.5	0.1	16	2	31	1190	890	1.2	2	2.2	38	2600	2290
25	2.5	0.1	16	2.1	34	1560	1080	1.2	2	2.3	41	3080	2600
35	2.5	0.1	16	2.2	37	1930	1270	1.3	2.5	2.4	45	3950	3280
50	2.5	0.1	16	2.3	40	2370	1480	1.3	2.5	2.5	47	4530	3630
70	2.5	0.1	16	2.4	43	3110	1820	1.4	2.5	2.6	51	5510	4210
95	2.5	0.1	16	2.5	47	4000	2200	1.5	2.5	2.8	55	6660	4860
120	2.5	0.1	16	2.6	50	4820	2550	1.5	2.5	2.9	59	7630	5360
150	2.5	0.1	25	2.8	54	5770	2970	1.6	2.5	3	62	8800	6000
185	2.5	0.1	25	2.9	58	6960	3460	1.6	2.5	3.1	66	10180	6670
240	2.6	0.1	25	3.1	65	8940	4340	1.8	3.15	3.4	75	13480	8870
300	2.8	0.1	25	3.3	70	10980	5190	1.9	3.15	3.6	81	15920	10130
400	3	0.1	35	3.5	79	13820	6440	2	3.5	3.9	90	19980	12590
500	3.2	0.1	35	3.7	87	19100	10755	2.1	3.5	4.1	98	24160	14820
630	3.2	0.1	35	4.4	107	26340	13150	2.1	4.4	4.4	107	29650	17710

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as

Nom. Cross - Section Area	Steel Flat Wire Armoured Cables						Double Steel Tape Armoured Cables
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm	mm	kg/km		mm	mm	mm	mm	kg/km
10	1.2	0.8	1.8	26.9	1415	1235	1.2	2X0.2	1.8	26	1060	885
16	1.2	0.8	1.8	29.2	1725	1445	1.2	2X0.2	1.8	28.3	1340	1055
25	1.2	0.8	1.9	32.2	2165	1735	1.2	2X0.2	1.9	31.3	1735	1305
35	1.3	0.8	2	35	2645	2025	1.3	2X0.2	2	34.1	2170	1555
50	1.3	0.8	2.1	37.4	3075	2295	1.3	2X0.5	2.1	38	2950	2170
70	1.4	0.8	2.2	41	3915	2755	1.4	2X0.5	2.3	41.8	3795	2635
95	1.5	0.8	2.3	45.3	4840	3335	1.5	2X0.5	2.4	46.1	4810	3200
120	1.5	0.8	2.4	48.7	5915	3865	1.5	2X0.5	2.5	49.5	5770	3705
150	1.6	0.8	2.5	52.1	6930	4395	1.6	2X0.5	2.6	52.9	6775	4235
185	1.6	0.8	2.6	56.2	8265	5100	1.6	2X0.5	2.8	57.2	8120	4950
240	1.8	0.8	2.8	62.2	10470	6220	1.8	2X0.5	2.9	63	10250	6025
300	1.9	0.8	3	68.2	12780	7420	1.9	2X0.5	3.1	69	12570	7200
400	2	0.8	3.3	75.9	15970	9110	2	2X0.5	3.4	76.7	15740	8870
500	2.1	0.8	3.5	84.2	19940	11130	2.1	2X0.8	3.6	86.5	20550	11750
630	2.2	0.8	3.7	93.5	25120	13670	2.2	2X0.8	3.9	96	25830	14400

Nom. Cross - Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area	Unarmoured Cables				Steel Round-Wire Armoured Cables
				Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
				Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm²	mm	mm	kg/km		mm	mm	mm	mm	kg/km
16	3.4	0.1	16	2.2	36	1410	1110	1.2	2	2.4	42	3000	2700
25	3.4	0.1	16	2.3	39	1800	1320	1.3	2.5	2.5	46	3900	3430
35	3.4	0.1	16	2.4	41	2170	1500	1.3	2.5	2.6	49	4430	3770
50	3.4	0.1	16	2.4	44	2630	1730	1.4	2.5	2.7	52	5080	4190
70	3.4	0.1	16	2.6	48	3400	2110	1.4	2.5	2.8	56	6050	4750
95	3.4	0.1	16	2.7	52	4310	2510	1.5	2.5	2.9	60	7180	5380
120	3.4	0.1	16	2.8	55	5150	2890	1.6	2.5	3	63	8230	5960
150	3.4	0.1	25	2.9	58	6100	3300	1.6	2.5	3.1	67	9380	6850
185	3.4	0.1	25	3	62	7310	3810	1.7	3.15	3.3	72	11160	8110
240	3.4	0.1	25	3.2	69	9290	4680	1.8	3.15	3.5	79	14110	9510
300	3.4	0.1	25	3.3	73	11240	5450	1.9	3.15	3.7	84	16420	10680
400	3.4	0.1	35	3.5	81	14040	6660	2	3.5	3.9	92	20620	12830
500	3.4	0.1	35	3.7	88	17830	8450	2.1	3.5	4.1	99	25090	16530
630	3.4	0.1	35	3.9	96	20030	10895	2.2	3.5	4.4	109	30880	19670

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as

Nom. Cross - Section Area	Steel Flat Wire Armoured Cables						Double Steel Tape Armoured Cables
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm	mm	kg/km		mm	mm	mm	mm	kg/km
16	1.2	0.8	2.2	39.7	2795	2515	1.2	2x0.5	2.3	40.5	2680	2395
25	1.3	0.8	2.2	42.7	3305	2885	1.3	2x0.5	2.4	43.7	3195	2775
35	1.3	0.8	2.3	45.2	3835	3215	1.3	2x0.5	2.5	46.2	3720	3100
50	1.4	0.8	2.4	47.8	4325	3570	1.4	2x0.5	2.6	48.8	4200	3445
70	1.5	0.8	2.5	51.8	5320	4185	1.5	2x0.5	2.7	52.8	5185	4050
95	1.5	0.8	2.7	56.1	6450	4875	1.5	2x0.5	2.8	56.6	6280	4700
120	1.6	0.8	2.8	59.7	7545	5510	1.6	2x0.5	2.9	60.5	7360	5325
150	1.7	0.8	2.9	63.1	8610	6150	1.7	2x0.5	3	63.9	8420	5950
185	1.7	0.8	3	67.4	10120	6995	1.7	2x0.5	3.1	68.2	9910	6780
240	1.8	0.8	3.2	73	12430	8205	1.8	2x0.5	3.3	73.9	12200	7970
300	1.9	0.8	3.3	78.3	14775	9455	1.9	2x0.5	3.4	79.1	14530	9200
400	2	0.8	3.5	85.2	17950	11190	2	2x0.8	3.7	87.3	18660	11850
500	2.1	0.8	3.7	92.8	21970	13270	2.1	2x0.8	3.9	95.3	22800	13990
630	2.2	0.8	4	102.7	27480	16160	2.2	2x0.8	4.1	105	28200	16910

Nom. Cross - Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area	Unarmoured Cables				Steel Round-Wire Armoured Cables
				Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
				Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm²	mm	mm	kg/km		mm	mm	mm	mm	kg/km
25	4.5	0.1	16	2.4	44	2100	1620	1.4	2.5	2.7	52	4560	4080
35	4.5	0.1	16	2.5	46	2510	1840	1.4	2.5	2.9	54	5080	4410
50	4.5	0.1	16	2.6	49	2980	2080	1.5	2.5	2.9	57	5740	4840
70	4.5	0.1	16	2.7	53	3760	2470	1.6	2.5	3	62	6770	5480
95	4.5	0.1	18	2.8	57	4700	2900	1.6	2.5	3.1	65	7890	6100
120	4.5	0.1	18	3	60	5590	3320	1.7	2.5	3.2	69	8970	6700
150	4.5	0.1	25	3.1	64	6560	3760	1.8	3.15	3.4	74	11030	8220
185	4.5	0.1	25	3.2	67	7800	4300	1.8	3.15	3.5	78	12490	8980
240	4.5	0.1	25	3.4	74	9820	5220	1.9	3.15	3.7	84	15040	10440
300	4.5	0.1	25	3.5	79	11800	6010	2	3.5	3.8	90	17920	12130
400	4.5	0.1	35	3.7	86	14620	7240	2.1	3.5	4.1	98	21360	13970
500	4.5	0.1	35	3.8	93	18160	9355	2.2	3.5	4.3	106	26490	17830

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as

Nom. Cross - Section Area	Steel Flat Wire Armoured Cables						Double Steel Tape Armoured Cables
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm	mm	kg/km		mm	mm	mm	mm	kg/km
25	1.4	0.8	2.4	48	3915	3495	1.4	2x0.5	2.5	48.8	3770	3345
35	1.4	0.8	2.5	50.8	4510	3980	1.4	2x0.5	2.6	51.6	4350	3735
50	1.5	0.8	2.6	53.3	5020	4270	1.5	2x0.5	2.7	54.1	4855	4105
70	1.6	0.8	2.7	57	5990	4870	1.6	2x0.5	2.8	57.8	5815	4690
95	1.6	0.8	2.8	61.2	7170	5600	1.6	2x0.5	3	62.2	7010	5435
120	1.7	0.8	2.9	65.1	8340	6320	1.7	2x0.5	3.1	66.1	8170	6145
150	1.8	0.8	3	68.3	9440	6995	1.8	2x0.5	3.2	69.3	9260	6770
185	1.8	0.8	3.2	72.8	10090	7385	1.8	2x0.5	3.3	73.6	10760	7850
240	1.9	0.8	3.3	78.3	13370	9155	1.9	2x0.5	3.4	73.9	13130	8900
300	2	0.8	3.5	83.7	15760	10460	2	2x0.8	3.6	86	16380	11070
400	2.1	0.8	3.7	90.5	19050	12260	2.1	2x0.8	3.9	93	19570	12960
500	2.2	0.8	3.9	98.2	23610	14430	2.2	2x0.8	4.1	100.7	23900	15190

Nom. Cross - Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area	Unarmoured Cables				Steel Round-Wire Armoured Cables
				Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
				Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm²	mm	mm	kg/km		mm	mm	mm	mm	kg/km
35	5.5	0.1	16	2.7	51	2850	2180	1.5	2.5	2.9	60	5700	5010
50	5.5	0.1	16	2.8	54	3340	2450	1.6	2.5	3	62	6370	5480
70	5.5	0.1	16	2.9	58	4150	2850	1.6	2.5	3.1	66	7370	6070
95	5.5	0.1	16	3	62	5110	3310	1.7	3.15	3.3	72	9400	7600
120	5.5	0.1	16	3.1	65	5990	3730	1.8	3.15	3.4	75	10530	8270
150	5.5	0.1	25	3.2	68	6980	4180	1.8	3.15	3.5	80	11800	8940
185	5.5	0.1	25	3.3	72	8240	4740	1.9	3.15	3.7	83	13350	9850
240	5.5	0.1	25	3.6	79	10310	5700	2	3.5	3.8	90	16430	11820
300	5.5	0.1	25	3.7	84	12360	6570	2.1	3.5	4	95	18870	13080
400	5.5	0.1	35	3.9	91	15220	7830	2.2	3.5	4.3	103	23260	15930
500	5.5	0.1	35	4.1	97	19105	10325	2.3	4	4.5	110	27800	19170

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as

Nom. Cross - Section Area	Steel Flat Wire Armoured Cables						Double Steel Tape Armoured Cables
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm	mm	kg/km		mm	mm	mm	mm	kg/km
35	1.5	0.8	2.7	55.7	5150	4530	1.5	2x0.5	2.8	56.5	4975	4355
50	1.6	0.8	2.8	58.2	5675	4935	1.6	2x0.5	2.9	59	5495	4750
70	1.6	0.8	2.9	61.9	6685	5570	1.6	2x0.5	3	62.7	6490	5375
95	1.7	0.8	3	66.4	7945	6390	1.7	2x0.5	3.1	67.2	7735	6180
120	1.8	0.8	3.1	70	9110	7103	1.8	2x0.5	3.2	70.8	8890	6880
150	1.8	0.8	3.2	73.2	10240	7770	1.8	2x0.5	3.3	74	10010	7535
185	1.9	0.8	3.3	77.7	11840	8750	1.9	2x0.5	3.4	78.5	11600	8500
240	2	0.8	3.5	83.2	14270	10070	2	2x0.5	3.6	85.5	14870	10680
300	2.1	0.8	3.6	88.6	16730	11440	2.1	2x0.8	3.8	91.1	17400	12130
400	2.2	0.8	3.9	96.5	20130	13350	2.2	2x0.8	4	97.9	20820	14050
500	2.3	0.8	4.1	103.3	24310	15600	2.3	2x0.8	4.2	105.6	25050	16350

Nom. Cross - Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area	Unarmoured Cables				Steel Round-Wire Armoured Cables
				Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
				Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm²	mm	mm	kg/km		mm	mm	mm	mm	kg/km
50	8	0.1	16	3.2	65	4340	3460	1.8	3.15	3.5	75	8950	8080
70	8	0.1	16	3.3	70	5220	3930	1.9	3.15	3.6	80	10150	8860
95	8	0.1	16	3.4	74	6240	4440	1.9	3.15	3.7	84	11390	9590
120	8	0.1	16	3.5	77	7180	4910	2	3.5	3.8	89	13200	10860
150	8	0.1	25	3.6	80	8220	5420	2.1	3.5	4	92	14520	11720
185	8	0.1	25	3.7	84	9540	6040	2.1	4	4.1	97	17020	13510
240	8	0.1	25	3.9	91	11720	7110	2.2	4	4.3	104	19810	15200
300	8	0.1	25	4	95	13790	8000	2.3	4.5	4.5	108	23310	17470
400	8	0.1	35	4.3	103	16820	9430	2.4	4.5	4.7	117	27010	19620
500	8	0.1	35	4.5	110	21550	12880	2.5	4.5	4.9	124	31130	22610

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as

Nom. Cross - Section Area	Steel Flat Wire Armoured Cables						Double Steel Tape Armoured Cables
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm	mm	kg/km		mm	mm	mm	mm	kg/km
50	1.8	0.8	3.1	70.2	7490	6775	1.8	2x0.5	3.3	71.2	7300	6585
70	1.9	0.8	3.2	74	8590	7540	1.9	2x0.5	3.4	75	8390	7335
95	1.9	0.8	3.4	78.5	9990	8460	1.9	2x0.5	3.5	79.3	9740	8210
120	2	0.8	3.5	82.2	11250	9270	2	2x0.8	3.6	84.5	11845	9875
150	2.1	0.8	3.6	85.6	12510	10070	2.1	2x0.8	3.7	87.9	13120	10700
185	2.1	0.8	3.7	89.8	14155	11100	2.1	2x0.8	3.9	92.3	14850	11800
240	2.2	0.8	3.8	95.4	16740	12575	2.2	2x0.8	4	97.9	17480	13320
300	2.3	0.8	4	100.9	19310	14120	2.3	2x0.8	4.2	103.4	20080	14900
400	2.4	0.8	4.2	107	22840	16170	2.4	2x0.8	4.4	110.3	23660	17000
500	2.5	0.8	4.4	115.5	27200	18610	2.5	2x0.8	4.6	118	28080	19510

Nom. Cross - Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area	Unarmoured Cables				Steel Round-Wire Armoured Cables
				Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
				Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm²	mm	mm	kg/km		mm	mm	mm	mm	kg/km
50	9.3	0.1	16	3.2	73.9	5320	4446	1.9	3.15	3.8	87	10970	10090
70	9.3	0.1	16	3.3	78	6166	4880	2	3.5	3.9	91.3	12220	10750
95	9.3	0.1	16	3.5	81.9	7144	5430	2.1	3.5	4	94.5	13560	11780
120	9.3	0.1	16	3.6	85.1	8232	6049	2.1	4	4.1	97.5	14880	13650
150	9.3	0.1	25	3.7	88.6	9273	6549	2.1	4	4.2	100.5	16150	14060
185	9.3	0.1	25	3.8	93.5	10845	7392	2.2	4	4.3	105.5	17840	14390
240	9.3	0.1	25	4	98.2	12675	8310	2.3	4.5	4.5	111.5	20410	15870
300	9.3	0.1	25	4.1	103.6	14960	9362	2.4	4.5	4.6	116.5	24100	18460
400	9.3	0.1	35	4.3	110	18055	10698	2.5	4.5	4.8	124.3	28680	20560

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as

Nom. Cross - Section Area	Steel Flat Wire Armoured Cables						Double Steel Tape Armoured Cables
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm	mm	kg/km		mm	mm	mm	mm	kg/km
50	1.9	0.8	3.3	80.5	9825	8986	1.9	2x0.5	3.5	82.5	9625	8786
70	2	0.8	3.6	85.5	11015	9769	2	2x0.8	3.8	87.6	10825	9569
95	2.1	0.8	3.8	88.5	12360	10580	2.1	2x0.8	3.9	90.5	12116	10327
120	2.1	0.8	3.9	91.5	13900	11715	2.1	2x0.8	4	94.5	13366	11113
150	2.1	0.8	4	94.8	15160	12440	2.1	2x0.8	4.1	97.5	14550	11830
185	2.2	0.8	4.1	99.5	17500	13450	2.2	2x0.8	4.2	101.7	16810	12765
240	2.3	0.8	4.2	104.1	19390	14890	2.3	2x0.8	4.4	107.5	18650	14155
300	2.4	0.8	4.4	109.5	21970	16280	2.4	2x0.8	4.6	112.8	21200	15000
400	2.5	0.8	4.6	116.3	25600	18430	2.5	2x0.8	4.8	118.8	24780	17600

Nom. Cross - Section Area	Nom. Insulation Thickness	Copper Tape Thickness	Copper Wire Screen Area	Unarmoured Cables				Steel Round-Wire Armoured Cables
				Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
				Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	Armour Wire Size	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm²	mm	mm	kg/km		mm	mm	mm	mm	kg/km
50	10.5	0.1	16	3.4	79.7	5928	5053	1.9	3.5	4	93.5	12050	11150
70	10.5	0.1	16	3.5	83.6	6900	5663	2	4	4.1	97	13150	11850
95	10.5	0.1	16	3.6	87.2	7863	6131	2.1	4	4.2	101.5	14800	12950
120	10.5	0.1	16	3.8	90.7	8817	6634	2.2	4	4.4	105.5	16050	13800
150	10.5	0.1	25	3.9	94.1	10085	7361	2.3	4.5	4.5	108	17420	14640
185	10.5	0.1	25	4	99.1	11573	8120	2.3	4.5	4.6	112	19200	15700
240	10.5	0.1	25	4.1	103.6	13387	9023	2.4	4.5	4.7	117	21050	16800
300	10.5	0.1	25	4.3	109.2	15658	10060	2.5	4.5	4.8	122.5	24900	19100
400	10.5	0.1	35	4.5	115.6	19013	11657	2.6	4.5	5.1	129	29200	21560

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as

Nom. Cross - Section Area	Steel Flat Wire Armoured Cables						Double Steel Tape Armoured Cables
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	Approx. Weight		Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	Approx. Weight
	Nom. Bedding Thickness	Armour Wire Size	Nom.Sheath Thickness	Approx. Overall Diameter	CU	AL	Nom. Bedding Thickness	No of Steel Tapes x Nom Tape Thickness	Nom. Sheath Thickness	Approx. Overall Diameter	CU	AL
mm²	mm	mm	mm	mm	kg/km		mm	mm	mm	mm	kg/km
50	1.9	0.8	3.5	86.5	10880	9990	1.9	2x0.8	3.7	87.5	10690	9800
70	2	0.8	3.6	90.5	12000	10795	2	2x0.8	3.8	91.4	10800	10590
95	2.1	0.8	3.8	94	13360	11570	2.1	2x0.8	3.9	95.2	13110	11327
120	2.2	0.8	3.9	96.4	13705	12710	2.2	2x0.8	4	98.7	14300	12110
150	2.3	0.8	4	99.5	16160	13440	2.3	2x0.8	4.1	102.1	15550	12800
185	2.3	0.8	4.1	105.1	18505	14465	2.3	2x0.8	4.2	107.3	17810	13765
240	2.4	0.8	4.2	109.8	20390	15890	2.4	2x0.8	4.4	112	19650	15150
300	2.5	0.8	4.4	115.5	22970	17280	2.5	2x0.8	4.6	118	22200	16500
400	2.6	0.8	4.6	122.1	26600	19430	2.6	2x0.8	4.8	124.6	25780	18600

Nom. Cross-Section Area	Unarmored						Armored
	Buried direct in Ground		Laid in Single Way Duct		Laid in Air		Buried direct in Ground		Laid in Single Way Duct		Laid in Air
	CU	AL	CU	AL	CU	AL	CU	AL	CU	AL	CU	AL
mm²	A		A		A		A		A		A
10	76	53	62	42	87	62	76	53	63	43	88	63
16	101	78	87	67	109	84	101	78	88	68	110	85
25	129	100	112	87	142	110	129	100	112	87	143	111
35	153	119	133	103	170	132	154	119	134	104	172	133
50	181	140	158	122	204	158	181	140	158	123	205	159
70	221	171	193	150	253	196	220	171	194	150	253	196
95	262	203	231	179	304	236	263	204	232	180	307	238
120	298	232	264	205	351	273	298	232	264	206	352	274
150	334	260	297	231	398	309	332	259	296	231	397	309
185	377	294	336	262	455	355	374	293	335	262	453	354
240	434	340	390	305	531	415	431	338	387	304	529	415
300	489	384	441	346	606	475	482	380	435	343	599	472
400	553	438	501	398	696	552	541	432	492	393	683	545
500	613	498	541	451	786	652	601	492	532	446	773	645
630	663	568	591	501	896	762	651	562	582	496	883	755

Nom. Cross-Section Area	Unarmored						Armored
	Buried direct in Ground		Laid in Single Way Duct		Laid in Air		Buried direct in Ground		Laid in Single Way Duct		Laid in Air
	CU	AL	CU	AL	CU	AL	CU	AL	CU	AL	CU	AL
mm²	A		A		A		A		A		A
10	73	51	59	40	82	58	73	51	60	41	82	59
16	98	76	84	65	104	80	98	76	85	66	104	81
25	125	97	109	84	135	105	125	97	109	85	136	105
35	150	116	130	101	164	127	150	116	131	101	164	127
50	176	137	154	119	195	151	177	137	155	120	197	153
70	216	167	189	147	243	189	216	168	190	147	244	190
95	258	200	227	176	296	229	257	200	227	176	296	230
120	292	227	258	201	339	263	292	227	259	201	339	264
150	328	255	291	226	385	299	327	254	291	226	385	300
185	371	289	330	257	441	343	368	288	328	257	439	343
240	429	335	384	300	519	406	424	332	381	299	513	402
300	482	378	434	340	590	462	475	374	429	338	583	459
400	545	432	494	392	678	538	534	426	485	387	666	530
500	605	492	534	445	768	638	594	486	525	440	756	630
630	655	562	584	495	878	749	644	556	575	490	862	741

Quality Control

Three Core Medium Voltage Power Cable to IEC 60502

Raw Material Test

NPC has always chosen raw material suppliers who have a good reputation, possess stable supply capabilities and have passed international quality system certifications (such as ISO 9001). And establish a long-term cooperative relationship with it, forming a stable and reliable raw material supply chain.
We will ensure that all raw materials are subject to strict inspection procedures upon entry to the factory, and can only be stored in the warehouse after they have been confirmed to meet the standards.

Process inspection

NPC has strict quality control procedures for each process in the cable production process.
Process documents: Develop detailed process flow and operation instructions to clarify the operating specifications and quality standards of each process.
Equipment calibration: Regularly calibrate key equipment such as wire drawing machines, stranding machines, extruders, and diameter gauges to ensure that the accuracy meets the requirements.
First piece confirmation: Before each batch of production, the first piece is trial-produced to confirm that the process parameters, product dimensions, electrical performance, etc. meet the standards before mass production can be carried out.

Finished Product

Inspectors conduct ex-factory inspections on cables according to relevant standards and corresponding product inspection specifications to ensure that each ex-factory product complies with the process regulations.

Application

Renewable Energy

Power & Energy Industry

Transport Sector

Real Estate & Construction

Infrastructure & Municipal Industry

Data Centers

Mining and Oil & Gas Industry

Industrial Manufacturer

Technical Advantages

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

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

Wires and Cables packaging (1)

Wires and Cables packaging (2)

Wires and Cables packaging (3)

Wires and Cables packaging (4)

Wires and Cables packaging (5)

Wires and Cables packaging (6)

Wires and Cables packaging (7)

Wires and Cables packaging (8)

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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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