This Article provides the general requirements for the application of overcurrent protective devices. Also, text was added dealing with listed busway plug-in units that read, “Enclosures for overcurrent devices shall be mounted in a vertical position. Start studying NEC Article 240 Questions-Answers. While the NFPA does allow such quotes, it does so only for the purposes of education regarding the National Electrical Code. ARTICLE 240 - OVERCURRENT PROTECTION A. The definition of “Tap Conductors” is found in NEC 240.2 and is as follows: “A 240.87 Arc Energy Reduction. National Electrical Code Top Ten Tips: Article 240 -- Overcurrent Protection. 2 Electric Power Systems Durham NEC 240.6(A) Standard Ampere Ratings for Fuses & Circuit Breakers Amperes 15 20 25 30 35 40 45 50 60 70 80 90 100 110 125 150 175 200 225 250 300 350 400 450 500 - - - 600 700 800 1000 1200 1600 2000 2500 3000 4000 5000 6000 - - However, this is only permitted under specific conditions as contained in 240.21. Learn vocabulary, terms, and more with flashcards, games, and other study tools. In accordance with 240.4, conductors (other than flexible cords, flexible cables and fixture wires) shall be protected against overcurrent in accordance … This article is not a substitute for the NEC. As new states adopt the 2020 NEC, it is important to stay current on how these changes may affect your next Trystar project. (A) Documentation. The NEC does permit conductors that are identified as “tap conductors” to have overcurrent protection set at a value that greatly exceeds the ampacity of the conductors. When sizing conductors, the rating of the overcurrent device must be considered. Where the highest continuous current trip setting for which the actual overcurrent device installed in a circuit breaker is rated or can be adjusted is 1200 A or higher, 240.87(A) and (B) shall apply. However, Section 240-3 contains twelve rules that modify the general requirement and … Notable Revisions in 240.87(B): This study guide will help you formulate a logical approach to the rules. Please note, we do quote from copyrighted material. E. edtjlt New member. Thread starter edtjlt; Start date May 12, 2015; NEC Article 240.87 2014 Revision yes Votes: 2 28.6% no Votes: 2 28.6% it isn't clear Votes: 3 42.9% Total voters 7; Poll closed May 22, 2015. Section 240.33 did not change. Article 240 in the National Electrical Code (NEC) provides general requirements for overcurrent protection and overcurrent protective devices. These rules are often misunderstood and misapplied by both installers and inspectors. NEC Section 240-3 requires the branch circuit, feeder, and service conductors to be protected against overcurrent in accordance with their ampacities as specified in Table 310-16. Here we provide a brief overview of new developments in Article 240.87 and some of the potential implications when designing your docking station requirements. Installation 240.1. NEC 2017 - ARTICLE 240.87. Scope. In the 1999 NEC, all exceptions in Article 240 were removed and made into positive text, so Section 240.33 returned to the pre-1984 Style. NEC® - Specified Methods for Arc Energy Reduction In the 2017 National Electrical Code® (NEC®), Article 240.87 – Arc Energy Reduction requires that a method for reducing fault clearing time be provided when equipment is supplied with electricity through overcurrent protection devices rated (or adjustable to) 1200 Amps or higher. 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