bradbb2005
Member
- Location
- South Carolina
- Occupation
- Electrical Designer
I am curious if anyone knows about when 60/75 C dual-rated smaller breakers became common or if it has always been so. We design a lot of renovations for the government where we reuse panels that could be from the '80s or earlier and there is no requirement nor desire to upgrade these panels. Sometimes we simply don't know the rating of the breakers that could potentially be reused and if it were only rated for 60C, we would need to adjust our ampacity selection. I understand a new breaker would most likely be rated 60/75C but really just wondering if there is a time where it was common to not have the 60/75C rating. Yes, we could pull the cover off and look at the breakers but usually, that is not feasible at the time of site survey. Also, this is D-B work and I know most would say upgrade everything, that just isn't how these projects work.
Thanks!
Thanks!