As in the case of all electrical equipment, earthing of electric equipment, earthing of electric motors shall be done properly. IS:3043 give much useful information about earthing and should be referred to.

The following precautions/checks are worth mentioning here.

1. Earthing of motor body should be done at two different places.

2. Check that the rating and size of earthing conductors are adequate.

3. Check that earthing resistance is proper.