The way in which creepage distances

The way in which creepage distances and clearances are measured is indicated in Annex A.Distances through slots or openings in external parts of insulating material are measured to the metal foil in contact with the accessible surface; the foil is pushed into corners and the like by means of the standard test probe B of IEC 61032:1997, but is not pressed into openings.The sum total of distances measured between parts operating at hazardous voltage and accessible surfaces is determined by measuring the distance from each part to the accessible surface. The distances are to be added together to determine the sum total. See Figure K.1. For the purpose of this determination, one of the distances shall be 1,0 mm or greater. See Annex A, cases 1 to 10.If necessary, a force is applied to any point on bare conductors and to the outside of metal enclosures, in an endeavour to reduce the creepage distances and clearances while taking the measurements.The force is applied by means of the test probe B of IEC 61032:1997 and has a value of:– 2 N for bare conductors;– 30 N for enclosures.Means provided for fixing the tool to a support are considered to be accessible.