C37.20.7 Guide for testing metal-enclosed switchgear rated up to 52kV for internal arcing faults has been revised to include both changes to the basic testing procedure and additional equipment types. The addition of these new equipment types has introduced new ratings and requires alterations to the basic arc fault test procedure.  Part one of this presentation will discuss the test procedure changes, compare the new procedure to the previous revision, discuss rating applications, and provide some insight for why the changes were necessary.  Part two will discuss properly applying arc resistant switchgear and how it fits into a typical safety program.