For machines with Class B insulation, how many layers of inter turn insulation is made use of and what is the distance between the layers?

For machines with Class B insulation, typically, a single layer of inter-turn insulation is used. The distance between the layers, or rather the thickness of this insulation, isn’t universally fixed and can vary depending on the specific application, the design requirements of the electrical machine, and the insulation material’s properties. Class B insulation is designed to withstand operating temperatures up to about 130°C. However, the exact specification for the thickness or distance for inter-layer insulation is determined by engineering requirements and standards relevant to the specific equipment or machinery being designed or used. For precise applications, one would need to consult manufacturer specifications or relevant engineering standards for the specific type of machine in question.