What is the acceptable resistance from motor windings to the ground?

The acceptable resistance from motor windings to the ground is typically considered to be 1 Million Ohms. This threshold indicates that the insulation between the windings and ground is in good condition. High resistance values are crucial for preventing electrical current from leaking to the ground, which could cause short circuits, equipment damage, or pose safety hazards.

If resistance values are significantly lower than this, it may indicate degraded insulation or potential failures in the winding, thus requiring further investigation. Maintaining a high resistance helps ensure that the electrical system operates safely and efficiently, protecting both the equipment and personnel from unforeseen electrical issues.

In contrast, values such as 100,000 Ohms, 10,000 Ohms, or 500,000 Ohms may suggest compromised insulation and increased risk, leading technicians to think about maintenance or replacement of the motor to ensure safety and reliability.