UL 497A-2001 通信电路的辅助保护装置.pdf
文档页数：84文档大小：1.6MB文档格式：pdfUL 497AISBN -7629-0626-X Secondary Protectors forCommunications CircuitsMARCH 20 .2001 -UL 497AUnderwriters Laboratories Inc .( UL) 333 Pfingsten RoadNorthbrook .IL 60062-2096UL Standard for Safety for Secondary Protectors for Communications Circuits ,UL 497AThird Edition ,Dated March 20 ,2001UL is in the process of converting its Standards for Safety to the Standard Generalized Markup Language( SGML),and implementing an SGML pliant document management and publishing system .SGMLan international standard ( ISO8879-1986 )-is a descriptive markup language that describes a document'sstructure and purpose ,rather than its physical appearance on a page .Significant benefits that will resultfrom UL's use of SGML and these new systems include increased productivity ,reduced turnaround times , and data and information consistency ,reusability ,shareability ,and portability .However ,the fonts , pagination ,and general formatting of UL's new electronic publishing system differ from that of UL'sprevious publishing system .Consequently ,when revision pages are issued for Standard with the newpublishing system ,these differences may result in the printing of page...
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