The degree of short-circuit protection afforded small low-voltage A-C and D-C starters by means of fuses and circuit breakers

G. H. Garcelon (Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pa.): This paper by Mr. Jones clarifying his previous AIEE paper on the same general subject is beneficial in that it definitely should eliminate the misunderstanding held in many places that National Electrical Code fuses were recommended for interrupting short-circuit currents up to 100,000 amperes. Although we believed that no such recommendation was intended, we received many assertions to the effect that they were being recommended for such service. As a result of this controversy numerous tests were made on several makes of National Electrical Code fuse, and we found nothing to indicate that any make of National Electrical Code fuse was good for much more than its Underwriters´ Laboratories rating of 10,000 amperes.