For power systems with nominal voltages above 1000 V a.c. and 1500 V d.c., to prepare international standards regarding:

1. A set of definitions used for insulation standardization and co-ordination.

2. The basic principles of insulation co-ordination.

3. The fields of application

4. The specification of a series of standard insulation levels (without regard to any particular type of equipment).

5. A full statement of the tests to be included in the specification of the equipment to meet the insulation levels to be used in relation to the possibilities of overvoltage protective devices.

6. Recommendations for the minimum clearance distance in air between live parts.

7. An application guide for the users of electrical equipment recommending the insulation levels to be used in relation to the possibilities of overvoltage protective devices.