IEEE Recommended Practice for Applying Low-Voltage Circuit by IEEE, American National Standards Institute

By IEEE, American National Standards Institute

Info is supplied for choosing the right kind circuit breaker for a selected program. This prompt perform is helping the applying engineer specify the kind of circuit breaker, scores, journey features, add-ons, reputation exams, and upkeep necessities. It additionally discusses circuit breakers for designated functions, e.g., instant in simple terms and switches. additionally, it presents details for employing circuit breakers at assorted destinations within the energy method, and for safeguarding particular parts. instructions also are given for coordinating combos of line-side and load-side units.

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Read Online or Download IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercia: (IEEE Blue Book) (The IEEE color book series: Blue book) PDF

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Extra info for IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercia: (IEEE Blue Book) (The IEEE color book series: Blue book)

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For example, assuming a 50 °C (90 °F) terminal rise over a 40 °C (104 °F) ambient for a total temperature of 90 °C (194 °F) gives T1 = T2 = 90 °C (194 °F) for rough estimating. 2) gives some guidance. It should be remembered that the properties of the materials used in the construction of circuit-breaker components determine the maximum limiting temperature allowable for any given circuit breaker, and they therefore determine the amount of de-rating necessary for any given over-temperature condition.

50-1989. 20™ standards. LVPCBs are generally UL Listed and can be UL Labeled. Ratings and test procedures for MCCBs and ICCBs are found in UL 489-1994. Other IEEE Color Books® complement this book, offering a complete and comprehensive source of application information for all three types of circuit breakers. 11 Endurance considerations Table 3-1, Table 3-2, and Table 3-3 summarize some specific mechanical and electrical endurance test parameters. 501989 and UL 489-1994. These standards do not lend themselves to one-to-one comparison.

When extreme cold or hot ambient conditions are possible, the addition of separate heating or air cooling systems is necessary. Copyright © 2006 IEEE. All rights reserved. 31 Authorized licensed use limited to: Nanyang Technological University. Downloaded on December 2, 2008 at 00:13 from IEEE Xplore. Restrictions apply. IEEE Std 1015-2006 CHAPTER 3 Table 3-5—Limits of temperature in circuit-breaker components c Limit of temperature rise over air surrounding enclosure (°C) Limit of total temperature (°C) Class 90 insulation 50 90 Class 105 insulation 65 105 Class 130 insulation 90 130 Class 166 insulation 115 155 Class 180 insulation 140 180 Class 220 insulation 180 220 Circuit-breaker contacts, conducting joints, and other parts (except the following) 85 125 Fuse terminals See Footnote a See Footnote a Series coils with over class 220 insulation or bare See Footnote a See Footnote a 55 95 Terminal connections aNo specified limit except not to damage adjacent parts.

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