STD.lEC 61284-ENGL 1997 .. 4844891 0657656 476 .. 61284 © IEC:1997 -51- The assembly shall be mounted in a tensile testing machine and anchored so that service conditions are simulated, precautions being taken to avoid birdcaging of the conductor. The clear length of conductor on each side of the repair sleeve shall be equal to or greater than 100 times the overall diameter of the conductor or 2,5 m, whichever is the smaller. The tensile test specified in 11.5.1 shall then be completed. 11.8 Insulator protective fittings The purchaser shall specify or agree relevant test methods and acceptance criteria. 12 Magnetic losses test 12.1 General This type test is aimed at ascertaining the magnetic losses of suspension clamps and U-bolt type tension clamps for overhead line conductors (clamps for earth wires are excluded). The test shall be carried out as agreed between purchaser and supplier (see 6.1.2 and table 1). 12.2 Test procedure A power frequency current (see figure 11) shall be passed through a suitable length of conductor and the power losses shall be measured both with and without the fittings assembled on the conductor. Armour rods shall be applied to the conductor if they are used in service. The test circuit geometry shall be exactly the same for both measurements. In each case, the conductor shall be allowed to reach its steady temperature. The conductor shall have the maximum diameter for which the fitting is designed. To measure the power losses of the fitting, a minimum number of five units shall be mounted on the conductor, spaced not less than 50 cm apart. The fittings under test shall be complete with all components assembled as defined in the supplier'S draWing of the fitting. The test shall employ an a.c. voltage at a frequency of 50 Hz or 60 Hz and the magnitude for the current shall be according to table 2. In countries where metric cables are not used, the test current shall be that of the smaller, nearest equivalent metric size conductor. Copyright International Electrotechnical Commission Provided by IHS under license with lEe Sold to;IHS Standards Store Purchase, 418792 No reproduction or netWorking permitted without license from IHS Not for Resaie,03/2612008 18:05:22 MDT