The insulation between windings and grounded core and the insulation between the windings of the same phase is

Answer: Option B

The insulation between windings and the grounded core, as well as the insulation between the windings of the same phase, is referred to as major insulation.

Major insulation is designed to withstand higher voltage stresses as it separates the high-voltage components from the grounded core and ensures the safety and reliability of the electrical machine.

In contrast, minor insulation is used for low voltage insulation, such as between adjacent turns in a winding, where the voltage stress is comparatively low.

Therefore, Option B is the correct answer.