Refinements in IEEE No. 117 Test Procedure for Evaluation of Life Expectancy of Random Wound Motor Insulation Systems

A ten-year industry-wide investigation into all phases of the 1956 AIEE no. 510 Test Procedure for Random Wound Motorettes is now complete and is reported here. The early publication of a revised motorette test procedure to be known as "IEEE no. 117" is now made possible. Based on the findings of the present study, it is now made manifestly clear that industry tests of this nature must insist on rigid adherence to all testing details if uniform results are to be achieved between different testing locations.