Revision of IEEE Std 99-1980. A general form is provided for the preparation of test procedures. Points to be considered by technical committees in the preparation of specific instructions for the thermal evaluation of insulation systems for electric equipment are suggested. The test procedures involve accelerated thermal aging of insulation systems and specify tests that the committees deem pertinent, based on conditions of use. The objective of the procedures is to provide for the functional evaluation, by test, of insulation systems for electric equipment.

This recommended practice provides criteria for the preparation of test procedures for accelerated thermal aging of insulation systems and for the specification of tests based on conditions of use. The objective of these test procedures is to provide for the functional evaluation, by test, of insulation systems for electrical equipment. The evaluation of insulating materials and simple combinations thereof is provided for by a separate material test guide, IEEE Std 98-2002. For a detailed discussion of the principles on which this recommended practice and IEEE Std 98-2002 are based, see IEEE Std 1-2000. Tests based on IEEE Std 98-2002 may be considered as preliminary tests for insulation system evaluation, but should not be used as accepted tests for the classification of systems.

This recommended practice provides a general form for the preparation of test procedures and suggests the points to be considered by technical committees in the preparation of specific instructions for the thermal evaluation of insulation systems for equipment.