IEEE standards download IEEE Std C37.20.7-2017 pdf download – IEEE Guide for Testing Switchgear Rated Up to 52 kV for Internal Arcing Faults IEEE Std C37.20.7-2017 pdf download - IEEE Guide for Testing Switchgear Rated Up to 52 kV for Internal Arcing Faults. 4. Ratings 4.1 General An IEEE guide cannot mandate or defne equipment ratings. This guide is intended... 02-26 Download Now