Creepage distances and clearances s

Creepage distances and clearances shall not be less than the values in millimetres shown in Table K.2. The clearances specified do not apply to the air gap between the contacts of thermal controls, overload protection devices, switches of micro－gap construction, and the like, or to the air gap between the current－carrying members of such devices where the clearances vary with the movement of the contacts. Creepages and clearances also do not apply to the construction of battery cells or the interconnections between cells in a battery pack. The values specified in Table K.2 do not apply to cross－over points of motor windings.For parts having a hazardous voltage between them, the sum total of the measured distances between each of these parts and their nearest accessible surface shall not be less than 1,5 mm clearance and 2,0 mm creepage.NOTE Figure K.1 provides clarification on the measurement method.Compliance is checked by measurement.The way in which creepage distances and clearances are measured is indicated in Annex A.For parts of different polarity, clearance and creepage distances less than those given in Table K.2 are acceptable if the shorting of the two parts does not result in the tool starting.NOTE The risk of fire due to spacings below the required values is covered by the requirements of 18.1.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 finger of Figure 1, but is not pressed into openings.