The insulating system of electric motors is basically based on the joining of different materials and insulating components used in various electrical equipment. Briefly, this junction is effected by means of some factors, such as wire insulation enamel, groove bottom, groove closure insulation and insulation between phases, for example. The characteristic of any product in a given thermal class does not automatically characterize that each insulating material or component used in its composition contains the same thermal capacity.
The maximum temperature limit for an insulation system should not be directly related to the thermal capacity of the materials used. In any system, the thermal performance of a component can be improved through protective specifications of some specific materials used in conjunction with that material.
The specification of a product of any thermal class does not necessarily mean that each insulation material used in its projection has the same thermal capacity or class. The maximum temperature limit of an insulation system may not be directly related to the thermal capacity of the individual materials used in the system.