Sep 23, 2020 · would anyone mind explaining the 80% rule for sizing breakers/wire. someone asked me recently and i couldnt exactly explain it well

Dec 13, 2024 · I'm reviewing the electrical code to teach other engineers the rules on feeder sizing and want to verify I'm still on the right track. It seems like there's still a lot of confusion …

Apr 1, 2014 · 80% rule applies to continious loads such as motors, lighting or any load expected to be on 3 hours or more. A breaker is rated for 100% of the noncontinious load which may …

Sep 30, 2014 · Yes, the NEC limits the load on receptacle circuits to 80% for portable appliances [210-23 (a)] and, yes, the maximum continuous load on a branch circuit shall not exceed 80% …

Mar 4, 2022 · The 80% rule is just to account for the possibility of heat from other breakers in the panel. All listed breakers must carry 100% of their rating at 40°C forever, in an open enclosure …

Sep 22, 2004 · Re: 80% Breaker Rating Rule? This is the way I have looked at and explained the breaker applications: Please correct me if I'm wrong but some misunderstand the concept of a …

Aug 13, 2022 · Does the 80% rule apply to service breakers? I am trying to figure out if we can add a pool to this service without an upgrade. We are right under 80% of the load calculation …

Jan 12, 2023 · Then I might apply an 80% factor to all the non-continous loads, 100% for the continuous load, and give them that number. Or are they very clear they mean NEC calculated …

Mar 18, 2003 · Re: No 80% rule bphgravity, maybe this will help. i spoke to one of my electrical suppliers and asked him about the 80% rating of breakers. when he came back to me he …

Mar 22, 2004 · Re: 80% rule misapplied so often. WHY? I agree with the Charlies. If you calculate the load, size the cable, then apply the breaker. The "80%" issue is a non-issue. A 100% rated …