UL 2808 Listed CTs and the NEC 2017 Code

Background Until recently, almost all current transformers (CTs) used with electric submeters were certified by Underwriters Laboratories (UL) as UL Recognized Components under the XODW standard, using a subset of the requirements from IEEE C57.13 and CSA 60044-1. The key phrase is “UL Recognized Component”. The UL Recognized status meant the CTs were not approved […]