28. Screws an30. Resistance to heat, fire and tracking ..........................................................................................173
30.1 General aspects of equipment ............................................................................................173
30.1.1 Resistance to heat, fire and tracking of components that are fully or partially
constructed of nonmetallic materials ..........................................................................173
30.1.2 Fire retardancy of PWBs.............................................................................................173
30.1.3 Fire retardancy of connectors on PWBs .....................................................................174
30.1.4 Fire retardancy of nonmetallic materials of noise suppressing capacitors located
within the special protection area ...............................................................................175
30.1.5 Fire retardancy of nonmetallic materials located in close proximity to motor
capacitors...................................................................................................................176
30.1.6 Fire retardancy of connectors in circuits operating at hazardous voltages..................177
30.1.7 Fire retardancy of contact components.......................................................................177
30.1.8 Resistance to tracking of contact components............................................................178
30.1.9 Fire retardancy and arc resistance of components located within the special
protection area of arc .................................................................................................179
30.1.10 Fire retardancy of components and constructional materials, which are in contact
with high-voltage wires ...............................................................................................179
30.1.11 Arc resistance of components and materials adjacent to high-voltage transformers ..180
30.1.12 Fire retardancy of components and materials adjacent to high-current connections ..180
30.1.13 Chemical resistance of plastic molding.......................................................................181
30.1.14 Chemical resistance of hermetically sealed equipment ..............................................182