don_resqcapt19 Moderator Staff member Location Illinois Occupation retired electrician Mar 10, 2022 #21 jim dungar said: I think it is just the ones listed to UL489. I wouldn't be surprised if it is near 30 years now Click to expand... Yes, UL 489, but that would cover most breakers used for HVAC systems, I think.
jim dungar said: I think it is just the ones listed to UL489. I wouldn't be surprised if it is near 30 years now Click to expand... Yes, UL 489, but that would cover most breakers used for HVAC systems, I think.
J jim dungar Moderator Staff member Location Wisconsin Occupation PE (Retired) - Power Systems Mar 10, 2022 #22 don_resqcapt19 said: Yes, UL 489, but that would cover most breakers used for HVAC systems, I think. Click to expand... For panelboards yes, but maybe not for control panel ones.
don_resqcapt19 said: Yes, UL 489, but that would cover most breakers used for HVAC systems, I think. Click to expand... For panelboards yes, but maybe not for control panel ones.