Electrical, Dimensions, and Related requirements for outdoor apparatus bushings that have insulation levels (BILs) 110 kV and above. To standardize the dimensions, ratings, test levels and performance characteristics of outdoor power apparatus bushings having insulation levels (BILs) 110 kV and above. Revision Standard - Superseded. Electrical, dimensional, and related requirements for outdoor power apparatus bushings that have basic impulse insulation levels (BILs) of 200 kV and above are covered. Specific values for dimensional and related requirements that are to be interpreted, measured, or tested, in accordance with IEEE Std C57.19.00-1991, are provided.