Compliance is checked by inspection

Compliance is checked by inspection, by measurement and, for the covering of insulating material on handles, operator controls and handle shafts, by the following tests.A sample of the covered part is conditioned at a temperature of (70 ± 2) °C for 7 days (168 h). After conditioning, the sample is allowed to attain approximately room temperature.Inspection shall show that the covering has not shrunk to such an extent that the required length of 150 mm or the required insulation is no longer given, or that the covering has not peeled off and that it may move longitudinally.After this, the sample is maintained for 4 h at a temperature of (-10 ± 2) °C.While still at this temperature, the sample is then subjected to impact by means of the apparatus shown in Figure 18. The weight A having a mass of 300 g falls from a height of 350 mm onto the chisel B of hardened steel, the edge of which is placed on the sample.One impact is applied to each place where the covering is likely to be weak or damaged in intended use, the distance between the points of impact being at least 10 mm.After this test, inspection shall show that the covering has not peeled off and an electric strength test is made between metal parts and metal foil wrapped round the covering in the area required to be insulated.The test voltage of 1 750 V is applied for 1 min.During this test, no flashover or breakdown shall occur.