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TACSR Conductor NB/T 42060

TACSR Conductor to NB/T 42060 is a concentric-lay overhead conductor of thermal-resistant aluminium alloy wires around a galvanized steel core, for continuous operation at up to 150 °C. The TDS covers types JNRLH1/G1A, JNRLH1/G2A and JNRLH1/G3A in 24 sizes, from 150/20 to 1440/120 mm².

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NB/T 42060 is the Chinese energy industry standard for thermal-resistant aluminium alloy conductors, steel reinforced, used on overhead transmission lines. It sets the type designations, requirements, tests, packing and marking of these conductors (NB/T 42060 Clause 1). The conductors on this page are stranded from NRLH1 thermal-resistant aluminium alloy wire, with a maximum permitted continuous operating temperature of 150 °C, to GB/T 30551, and galvanized steel wire of strength grade 1, 2 or 3 (G1A, G2A or G3A) to GB/T 3428 (NB/T 42060 Clause 1). The resistivity taken for NRLH1 wire is 28.735 nΩ·m, which corresponds to 60.0% IACS (NB/T 42060 Clause 1).

Conductor Construction

Materials: Round thermal-resistant aluminium alloy wires and galvanized steel wires, each meeting its wire standard before stranding (NB/T 42060 Clause 4.1)
Stranding: All wires stranded concentrically, adjacent layers laid in opposite directions, and the outer layer right-hand unless the purchaser specifies otherwise (NB/T 42060 Clauses 4.4.1 and 4.4.2)
Lay ratio: Steel core: 16 to 26 for the 6-wire layer and 14 to 22 for the 12-wire layer; alloy layers: inner 10 to 16, outer 10 to 14; no layer has a larger lay ratio than the layer beneath it (NB/T 42060 Clauses 4.4.4 and 4.4.5)
Wire position: Steel wires and the outer alloy layer stay in place, or are easily put back by hand, when the conductor is cut (NB/T 42060 Clause 4.4.6)
Joints: No joints in any steel wire; alloy wire joints only where a wire breaks by accident during stranding, made by cold pressure welding, at least 15 m apart and within the number allowed for the count of alloy layers (NB/T 42060 Clauses 4.5.1 to 4.5.4)
Surface: Free from visible defects such as obvious scratches or dents (NB/T 42060 Clause 4.3)

Rated Tensile Strength and Resistance

The rated tensile strength of the conductor is the sum of the rated strength of all alloy wires and the tension in the steel wires at the elongation reached when the alloy part breaks; for practical purposes the steel contribution is taken as the stress at 1% elongation on a 250 mm gauge length (NB/T 42060 Clause 4.7.1). The strength of each wire is its nominal area multiplied by the minimum tensile strength of its wire standard (NB/T 42060 Clause 4.7.2). The DC resistance at 20 °C is calculated without counting the steel wires (NB/T 42060 Clause 4.8). Mass per unit length is worked out from the wire densities, the stranding increments and the unrounded wire areas (NB/T 42060 Clause 4.6.1).

Physical Data

Item	Value
Max. continuous operating temperature of NRLH1 wire	150 °C
Resistivity of NRLH1 wire	28.735 nΩ·m (60.0% IACS)
Tensile strength of cold pressure welded joints in NRLH1 wire	≥130 MPa
Long-term heat resistance test	180 °C for 400 h, then at least 90% of the room-temperature breaking strength

Typical Applications

Overhead transmission lines where a conductor rated for continuous operation at up to 150 °C is required

TACSR Conductor to NB/T 42060 combines thermal-resistant aluminium alloy wires with a galvanized steel core. The main data are summed up below; every size is listed in the TDS tab.

Technical Characteristics

Applicable Standard	NB/T 42060
Types	JNRLH1/G1A, JNRLH1/G2A, JNRLH1/G3A
Alloy Wire	NRLH1 thermal-resistant aluminium alloy to GB/T 30551, 60.0% IACS
Core Wire	Galvanized steel wire to GB/T 3428, strength grade 1, 2 or 3
Max. Continuous Operating Temperature	150 °C
Sizes	150/20 to 1440/120 mm² (alloy/steel), 24 sizes
Number of Wires	Alloy 24 to 88; steel 7 or 19
Conductor Diameter	16.7 mm to 51.4 mm
Linear Mass	549.0 kg/km to 4926.4 kg/km
Rated Tensile Strength	46.20 kN to 411.9 kN, by type
DC Resistance at 20 °C	0.0205 Ω/km to 0.2014 Ω/km
Outer Lay Direction	Right-hand unless otherwise ordered
Delivery	On drums, outer layer at least 30 mm inside the flange edge

Ordering Information

Please state the quantity; the type, size, area and stranding; the length per drum and its tolerance, and any short lengths for the project; the type, size and method of packing and any special packing or drum bore; whether lagging is needed; whether inspection is wanted, where, and which tests; the outer lay direction if not right-hand; and any grease requirement.

JNRLH1/G1A, JNRLH1/G2A and JNRLH1/G3A Conductors

Nominal Area, Alloy/Steel	Number of Wires		Wire Diameter		Calculated Area			Conductor Diameter	Linear Mass	Rated Tensile Strength			DC Resistance at 20 °C
Nominal Area, Alloy/Steel	Alloy	Steel	Alloy	Steel	Alloy	Steel	Total	Conductor Diameter	Linear Mass	JNRLH1/G1A	JNRLH1/G2A	JNRLH1/G3A	DC Resistance at 20 °C
mm²	No.	No.	mm	mm	mm²	mm²	mm²	mm	kg/km	kN	kN	kN	Ω/km
150/20	24	7	2.78	1.85	145.7	18.8	164.5	16.7	549.0	46.20	48.83	51.47	0.2014
185/30	26	7	2.98	2.32	181.3	29.6	210.9	18.9	732.0	63.11	67.25	71.10	0.1619
240/30	24	7	3.60	2.40	244.3	31.7	276.0	21.6	921.5	75.68	80.11	84.23	0.1201
240/40	26	7	3.42	2.66	238.8	38.9	277.7	21.7	963.5	83.04	88.49	93.54	0.1229
300/25	48	7	2.85	2.22	306.2	27.1	333.3	23.8	1057.9	82.53	86.33	90.12	0.0959
300/40	24	7	3.99	2.66	300.1	38.9	339.0	23.9	1132.0	92.06	97.51	102.6	0.0977
300/50	26	7	3.83	2.98	299.5	48.8	348.3	24.3	1208.6	103.3	110.1	116.5	0.0980
400/25	45	7	3.33	2.22	391.9	27.1	419.0	26.6	1294.7	95.19	98.98	102.8	0.0750
400/35	48	7	3.22	2.50	390.9	34.4	425.3	26.8	1348.7	102.5	107.3	111.8	0.0752
400/50	54	7	3.07	3.07	399.7	51.8	451.5	27.6	1510.5	121.8	129.0	136.3	0.0736
400/65	26	7	4.42	3.44	398.9	65.1	464.0	28.0	1610.0	135.0	144.1	153.2	0.0736
400/95	30	19	4.16	2.50	407.8	93.3	501.1	29.1	1857.9	171.2	184.2	196.3	0.0720
500/35	45	7	3.76	2.51	499.7	34.6	534.3	30.1	1651.3	120.4	125.3	129.8	0.0588
500/45	48	7	3.60	2.80	488.6	43.1	531.7	30.0	1687.0	128.3	134.3	139.9	0.0601
500/65	54	7	3.44	3.44	501.9	65.1	567.0	31.0	1896.5	152.9	162.0	171.1	0.0586
630/45	45	7	4.22	2.81	629.4	43.4	672.8	33.8	2078.4	149.6	155.6	161.3	0.0467
630/55	48	7	4.12	3.20	639.9	56.3	696.2	34.3	2208.3	163.7	171.6	179.4	0.0459
630/80	54	19	3.85	2.31	628.6	79.6	708.2	34.7	2363.1	190.7	201.9	212.2	0.0468
720/50	45	7	4.53	3.02	725.3	50.1	775.4	36.2	2395.9	170.5	177.5	184.5	0.0405
800/55	45	7	4.80	3.20	814.3	56.3	870.6	38.4	2690.0	191.4	199.3	207.2	0.0361
800/70	48	7	4.63	3.60	808.2	71.3	879.5	38.6	2790.1	206.9	211.9	224.0	0.0364
900/75	84	7	3.69	3.69	898.3	74.9	973.2	40.6	3071.3	227.9	233.1	245.8	0.0328
1400/135	88	19	4.50	3.00	1399.6	134.3	1533.9	51.0	4926.4	375.6	394.4	411.9	0.0210
1440/120	84	19	4.67	2.80	1438.8	117.0	1555.8	51.4	4899.7	362.1	378.5	393.7	0.0205

Sample Tests

In accordance with NB/T 42060 Clauses 5.2.1 and 5.3, wires are checked against their wire standards before stranding, and the conductor is checked for area, diameter, linear mass, surface, lay ratio and lay direction, and wire properties after stranding, on samples taken from the outer ends of 10% of the drums; the surface of every drum is inspected before packing.
In accordance with NB/T 42060 Clause 5.5.1, the area of any sample does not differ from the calculated area by more than ±2%.
In accordance with NB/T 42060 Clause 5.5.2, conductor diameter stays within ±1% for diameters of 10 mm and above, and within ±0.1 mm below 10 mm.
In accordance with NB/T 42060 Clause 5.5.3, the linear mass, without grease, is within ±2% of the nominal value.
In accordance with NB/T 42060 Clause 5.5.6, wires taken from the conductor keep at least 95% of the tensile strength they had before stranding, and their resistivity meets the wire standard.

Type Tests

In accordance with NB/T 42060 Clauses 5.1.2 and 5.2.2, type tests are made once for a new design or a new process and repeated only when either changes; they cover the sample test items, stress-strain, breaking strength, DC resistance at 20 °C, long-term heat resistance, creep and high-temperature creep, at a qualified third-party laboratory.
In accordance with NB/T 42060 Clause 5.6.2, the conductor reaches at least 95% of the rated tensile strength with no single wire breaking.
In accordance with NB/T 42060 Clause 5.6.4, after 400 h at 180 °C and natural cooling, the breaking strength is at least 90% of the room-temperature value.
In accordance with NB/T 42060 Clause 5.6.6, high-temperature creep is measured with the gauge length held at 150 ± 3 °C, under a load agreed between the purchaser and the supplier.

Packing and Marking

In accordance with NB/T 42060 Clause 6.1, the conductor is delivered on drums, with the outer layer at least 30 mm from the flange edge; more than one length on a drum is clearly marked apart, and short lengths may be supplied in coils tied in at least three places.
In accordance with NB/T 42060 Clause 6.2, each drum is marked with the type and size, the unwinding direction, a mark that the drum is not to be laid flat, the length of each conductor, the gross and net mass, the date and the standard number.
In accordance with NB/T 42060 Clause 6.3, short lengths are at least 50% of the contract length and not more than 5% of the total quantity delivered.

Product Inquiry

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Please send your required cable designation, number of conductors, nominal cross-section, support cable type, rated voltage, packing length, and project standard.

Selected Product: TACSR Conductor NB/T 42060