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Galvanized Steel Conductor

The galvanized single steel wires or stranded steel wires are suitable for the cores of ACSR to improve its tensile strength. And they can also be used in the aerial transmission line as the line material of the ground connection to avoid a lightning strike.

Standard ASTM A 475, BS 183, IEC 61089

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Construction

Technical Specifications

Quality Control

Application

Construction

Galvanized Steel Conductor

Conductor

Galvanized Clad steel wire earthwire/staywire/guywire/spacer cable (GSW): GSW Earth Wire, Stay Wire, Guy Wires, Spaces Cables, etc. are used as overhead ground wire or static wire on transmission lines, as pole or structure guy wires, and as messenger cable for field-erected aerial cable.

Technical Specifications

Galvanized Steel Conductor

IEC 60189

ASTM A475

BS 183

Code No.	Section Area	No./Dia of Wire	Approx. Overall Diameter	Approx. Weight	Breaking Load				DC Resistance at 20°C Max.
Code No.	Section Area	No./Dia of Wire	Approx. Overall Diameter	Approx. Weight	S1A	S1B	S2A	S3A	DC Resistance at 20°C Max.
	mm²	No./mm	mm	kg/km	kN	kN	kN	kN	Ohm/km
4	27.1	7/2.22	6.66	213.3	36.3	33.6	39.3	43.9	7.1445
6.3	42.7	7/2.79	8.36	335.9	55.9	51.7	60.2	67.9	4.5362
10	67.8	7/3.51	10.53	553.2	87.4	80.7	93.5	103.0	2.8578
12.5	84.7	7/3.93	11.78	666.5	109.3	100.8	116.9	128.8	2.2862
16	108.4	7/4.44	13.32	853.1	139.9	129.0	199.7	164.8	1.7861
16	108.4	19/2.70	13.48	857.0	142.1	131.2	152.9	172.4	1.7944
25	169.4	19/3.37	16.85	1339.1	218.6	201.6	238.9	262.6	1.1484
40	271.1	19/4.26	21.31	2141.6	349.7	322.6	374.1	412.1	0.7177
40	271.1	37/3.05	21.38	2148.1	349.7	322.6	382.3	420.2	0.7196
63	427.0	37/3.83	26.83	3383.2	550.8	508.1	589.3	649.0	0.4569

Nominal Dia. of Strand in.[mm]		No. of Wires in Strand	Nominal Dia. of Coated Wires in Strand in.[mm]		Approximate Weight of Strand lb/1000ft[kg/km]			Minimum Breaking Strength of Strand,lbf[KN]
Nominal Dia. of Strand in.[mm]		No. of Wires in Strand	Nominal Dia. of Coated Wires in Strand in.[mm]		Approximate Weight of Strand lb/1000ft[kg/km]			Common Grade			Siemens-Martin Grade			High-Strength Grade			Extra High-Strength Grade
1/8	3.18	7	0.041	1.04		32	48		540	2.402		910	4.048	1	330	5.916	1	830	8.14
5/32	3.97	7	0.052	1.32		51	76		870	3.87	1	470	6.539	2	140	9.519	2	940	13.078
3/16	4.76	7	0.062	1.57		73	109	1	150	5.115	1	900	8.452	2	850	12.677	3	990	17.748
3/16	4.76	7	0.065	1.65		80	119
7/32	5.56	3	0.104	2.64		88	131	1	400	6.228	2	340	10.409	3	500	15.569	4	900	21.796
7/32	5.56	7	0.072	1.83		98	146	1	540	6.85	2	560	11.387	3	850	17.126	5	400	24.02
1/4	6.35	3	0.12	3.05		117	174	1	860	8.274	3	40	13.523	4	730	21.04	6	740	29.981
1/4	6.35	3	0.12	3.05		117	174
1/4	6.35	7	0.08	2.03		121	180	1	900	8.452	3	150	14.012	4	750	21.129	6	650	29.581
9/32	7.14	3	0.13	3.3		137	204	2	80	9.252	3	380	15.035	5	260	23.398	7	500	33.362
9/32	7.14	7	0.093	2.36		164	244	2	570	11.432	4	250	18.905	6	400	28.469	8	950	39.812
5/16	7.94	3	0.145	3.68		171	255	2	490	11.076	4	90	18.193	6	350	28.246	9	100	40.479
5/16	7.94	7	0.104	2.64		205	305	3	200	14.234	5	350	23.798	8	0	35.586	11	200	49.82
5/16	7.94	7	1.109	2.77		225	335
3/8	9.52	3	0.165	4.19		220	328	3	330	14.813	5	560	24.732	8	360	37.187	11	800	52.489
3/8	9.52	7	0.12	3.05		273	407	4	250	18.905	6	950	30.915	10	800	48.04	15	400	68.503
7/16	11.11	7	0.145	3.68		399	595	5	700	25.355	9	350	41.591	14	500	64.499	20	800	92.523
1/2	12.7	7	0.165	4.19		517	770	7	400	32.917	12	100	53.823	18	800	83.627	26	900	119.657
1/2	12.7	19	0.1	2.54		504	751	7	620	33.895	12	700	56.492	19	100	84.961	26	700	118.768
9/16	14.29	7	0.188	4.78		671	1000	9	600	42.703	15	700	69.837	24	500	108.981	35	0	155.688
9/16	14.29	19	0.113	2.87		637	949	9	640	42.881	16	100	71.616	24	100	107.202	33	700	14.905
5/8	15.88	7	0.207	5.26		813	1211	11	600	51.599	19	100	84.961	29	600	131.667	42	400	188.605
5/8	15.88	19	0.125	3.18		796	1186	11	0	48.93	18	100	80.513	28	100	124.995	40	200	178.819
3/4	19.05	19	0.15	3.81	1	155	1721	16	0	71.172	26	200	116.543	40	800	181.487	58	300	259.331
7/8	22.22	19	0.177	4.5	1	581	2356	21	900	97.416	35	900	159.691	55	800	248.211	79	700	354.523
1	25.4	19	0.2	5.08	2	73	3089	28	700	127.664	47	0	209.066	73	200	325.61	104	500	464.839
1	25.4	37	0.143	3.63	2	57	3065	28	300	125.885	46	200	205.508	71	900	319.827	102	700	456.832
11/8	28.58	37	0.161	4.09	2	691	4010	36	0	160.136	58	900	262	91	600	407.457	130	800	581.827
11/4	31.75	37	0.179	4.55	3	248	4840	44	600	198.391	73	0	324.72	113	600	505.318	162	200	721.502

No/Dia of Wire	Approx. Overall Diameter	Minimum Breaking Strength of Strand							Approx. Weight
No/Dia of Wire	Approx. Overall Diameter	Grade 350	Grade 480	Grade 700	Grade 850	Grade 1000	Grade 1150	Grade 1300	Approx. Weight
No/mm	mm	kN	kN	kN	kN	kN	kN	kN	kg/km
3/1 80	3.90	2.7	3.7						60.0
3/2 65	5.70	5.8	8.0						130.0
3/3 25	7.00	8.7	12.0						195.0
3/4 00	8.60	13.2	18.1						295.0
4/1 80	4.40	3.6	4.9						80.0
4/2 65	6.40	7.7	10.6						172.0
4/3 25	7.90	11.6	15.9						260.0
4/4 00	9.70	17.6	24.1	35.2					390.0
5/1 50	4.10	3.1	4.2	6.2					69.0
5/1 80	4.90	4.5	6.1	8.9					95.0
5/2 65	7.20	9.7	13.3	19.3					220.0
5/3 25	8.80	14.5	19.9	29.0					320.0
5/4 00	10.80	22.0	30.2	44.0					490.0
7/0 56	1.70	0.6	0.8	1.2	1.7	2.0	2.2	14.0
7/0 71	2.10	1.0	1.3	1.9	2.8	3.2	3.6	28.0
7/0 85	2.60	1.4	1.9	2.8	4.0	4.6	5.2	31.0
7/0 90	2.70	1.6	2.1	3.1	4.5	5.1	5.8	35.0
7/1 00	3.00	1.9	2.6	3.9	5.5	6.3	7.2	43.0
7/1 25	3.80	3.0	4.1	6.0	8.6	9.9	11.2	67.0
7/1 40	4.20	3.8	5.2	7.5	9.2	10.8	12.4	14.0	84.0
7/RS*	4.30	3.9	5.3	7.7	9.4	11.0	12.7	14.3	86.0

Quality Control

Galvanized Steel Conductor

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

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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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