AS 3822:2002 pdf free.Test methods for bare overhead conductors.
4 PREPARATION OF A SAMPLE FOR TENSILE LOADING OF A WHOLE CONDUCTOR
Preparation of a conductor test piece is critical to the accuracy and validity of the test results. Test pieces shall be prepared with due consideration to the prevention of conductor rotation and loosening of wires and to the minimizing of damage to wires.
The selected test sample shall be free from scratches and other blemishes and shall have been manufactured under normal production conditions. Test pieces shall be taken at least 20 m from the end of a test sample. The total length of the test piece shall allow for the gauge length and terminations. Low elongation binding tape and hose or screw clips have been found to be suitable for retaining the wires in position.
The minimum gauge length shall be 3.0 m. The terminations shall be at least 1.0 m from each gauge point.
The terminations shall be designed so that the tensile load is distributed evenly to all wires. Care must be taken to ensure that the original position of the stranded layers is maintained during termination.
A type test to determine the termination suitability may be necessary to ensure that the termination will sustain 95% of the calculated breaking load of the conductor for at least four hours without any detectable movement.
5 MEASUREMENT
5.1 Temperature measurement
The temperature of test pieces shall be measured by devices attached to their surface. There shall be at least three temperature measuring devices equally spaced along the gauge length. The ambient temperature shall also be measured.
5.2.2 Creep test
All creep measurements shall be made with an accuracy of 2 im/m. The measuring device may include a reference material for the purpose of making temperature corrections when applicable. If gauge bars are used it is recommended that they have similar thermal mass to the test piece.
5.2.3 Stress/strain and coefficient of thermal elongation tests
Strain measurement shall be made with an accuracy of 20 im/m.
5.2.4 Conductor elongatiomi during the breaking load test
The extensometer used in this test shall permit simultaneous measurement of conductor elongation while the tensile load is continually increased. The accuracy of measurement shall allow a 0.1 % proof load to be determined.
NOTE: A C Grade extensometer complying with AS 1391 will satisfy the requirements of Clause 5.2.4.
5.3 Load measurement
The load measuring device shall be calibrated to meet the requirements of AS 2193 for Grade A.AS 3822 pdf download.