NEMA publishes white paper on series ratings.
Press Release Summary:
NEMA ABP 5-2015 Series Ratings applies to molded case circuit breakers that are designed to protect rated conductors and in particular, ones that may be used in series-rated system. White paper shows why it is important to understand how the short circuit interrupting ratings are assigned to a combination of two or more overcurrent protective devices which are connected in series, and in which the rating of the downstream device(s) in the combination is less than the series rating.
Original Press Release:
NEMA Publishes NEMA ABP 5-2015 Series Ratings
ROSSLYN, Va., —The National Electrical Manufacturers Association (NEMA) published NEMA ABP 5-2015 Series Ratings. This applies to molded case circuit breakers that are designed to protect rated conductors and in particular, ones that may be used in a series-rated system. This white paper shows why it is important to understand how the short circuit interrupting ratings are assigned to a combination of two or more overcurrent protective devices which are connected in series, and in which the rating of the downstream device(s) in the combination is less than the series rating.
Originally developed in 1994 by the NEMA Molded Case Circuit Breakers Committee, revisions were made to bring this paper up to date with the latest testing references and requirements, and to align with current terminology and industry practices.
NEMA ABP 5-2015 may be downloaded at no cost on the NEMA website.
The National Electrical Manufacturers Association (NEMA) represents nearly 400 electrical, medical imaging, and radiation therapy manufacturers. Our combined industries account for more than 400,000 American jobs and more than 7,000 facilities across the U.S. Domestic production exceeds $117 billion per year. Our industry is at the forefront on electrical safety, reliability, resilience, efficiency, and energy security.
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