ACSR/AW Conductor GB/T 1179

ACSR/AW Conductor to GB/T 1179 has an L-type hard aluminium envelope on an aluminium-clad steel core. The table below summarises the construction and calculation values of the standard; the properties of every code number are listed in the TDS tab.

Technical Characteristics

Ordering Information

Please state the quantity; the type code, nominal area and number of wires, for example JL/LB20A-630/55-48/7; the length per drum and its tolerance; the packing and any special drum requirements; whether inspection is required and where; whether breaking strength, stress-strain, creep or d.c. resistance tests, or tests on wires after stranding, are required; and the direction of lay if other than right-hand.

JL/LB14

JL/LB20A

Wire and Conductor Sample Tests

• In accordance with GB/T 1179 Clauses 6.2.2 and 6.4.1, all wires are sampled before stranding and tested against their own wire standards: GB/T 17048 for the aluminium and GB/T 17937 for the aluminium-clad steel.
• In accordance with GB/T 1179 Clause 6.3, samples for the sample tests are cut at random from the outer ends of 10% of the drums, and the surface of every drum is examined before packing.
• In accordance with GB/T 1179 Clause 6.6.1, the aluminium area worked out from measured wire diameters stays within ±2% of the calculated value and within ±1.5% of the mean of four readings taken at least 20 cm apart; the core area is the sum of its wire areas.
• In accordance with GB/T 1179 Clause 6.6.2, the overall diameter is read to 0.01 mm between the closing die and the capstan and kept within ±1% of nominal for diameters of 10 mm or more, or ±0.1 mm below 10 mm.
• In accordance with GB/T 1179 Clause 6.6.3, the linear mass, measured to ±0.1%, is within ±2% of the value listed in the TDS.
• In accordance with GB/T 1179 Clause 6.6.4, wires taken from the finished conductor are straightened, pulled at 25 mm/min to 100 mm/min and reach at least 95% of their tensile strength before stranding.
• In accordance with GB/T 1179 Clauses 6.6.6 and 6.6.7, the surface shows no visible defects, and the lay ratio and direction of lay of every layer are checked against Clause 5.4.

Type Tests

• In accordance with GB/T 1179 Clauses 6.4.3 and 6.5.2, a sample at least 400 times the conductor diameter and not shorter than 10 m carries at least 95% of the rated strength with no wire breaking; a sample failing within 1 cm of a fitting may be retested, up to three tests in all.
• In accordance with GB/T 1179 Clauses 5.5.5 and 6.5.3, the welding method is shown by recent or new test results to give hard aluminium wire joints a tensile strength of at least 130 MPa.
• In accordance with GB/T 1179 Clause 6.5.5, the d.c. resistance at 20 °C is measured by the method of GB/T 3048.4 and does not exceed the value listed in Appendix A; the aluminium-clad steel core is included in the calculation.
• In accordance with GB/T 1179 Clauses 6.5.1 and 6.5.4, where agreed, a stress-strain test follows Appendix D and a creep test follows GB/T 22077 at tensions such as 15%, 25% and 35% or 40% of the rated strength.

Inspection, Packing and Marking

• In accordance with GB/T 1179 Clauses 6.7.1 and 6.8, tests and inspection take place at the works before shipment unless agreed otherwise; a failed sample allows the lot it represents to be rejected, after which each drum of the lot may be tested once more and the conforming drums supplied.
• In accordance with GB/T 1179 Clauses 7.1 and 7.2, the conductor is delivered on drums to JB/T 8137 with at least 30 mm clearance below the flange rim, each drum marked with the producer’s name, type code, nominal area and number of wires, direction of rotation, length, gross and net mass and month of production.
• In accordance with GB/T 1179 Clause 7.3, unavoidable short lengths are at least 50% of the agreed production length and make up no more than 5% of the quantity delivered.