Secondary Ground-Fault Protection in Neon Signs and Outline Lighting
All UL Listed signs and outline lighting which incorporate electric discharge tubing are required to use neon transformers and power supplies that comply with UL 2161, the Standard for Neon Transformers and Power Supplies. UL 2161 includes requirements for secondary ground fault protection (SGFP). Previous Situation Prior to September 3, 1999, gas tube sign transformers [...]











