NFPACONFERENCE&EXPO SANANTONIO2019 NEC Power Aid GFCI PROTECTION, EMERGENCY POWER DISCONNECTS, AND MUCH MORE: AN OVERVIEW OF KEY CHANGES TO THE 2020 NEC. By Derek Vigstol 52 | NFPA JOURNAL * M A Y / J U N E 2 0 1 9 feature NEC_05.19 sjs EC ajv.indd 52 5/2/19 2:49 PM