UL UL508 ⑧ Underwriters Laboratories Inc . Standard for Safety Industrial Control Equipment SEPTEMBER 19 .2008 -UL 508 Underwriters Laboratories Inc .( UL) 333 Pfingsten Road Northbrook ,IL 60062-2096 UL Standard for Safety for Industrial Control Equipment ,UL 508 Seventeenth Edition ,Dated January 28 ,1999 Revisions :This Standard contains revisions through and including September 19 ,2008 Summary of Topics Revisions are being issued to modify the scope to reference UL 1008 for assemblies constructed of two or more controllers intended to transfer power to a mon output between multiple input sources . UL Standards for Safety are developed and maintained in the Standard Generalized Markup Language ( SGML).SGML - an international standard ( ISO8879-1986 )--is a descriptive markup language that describes a document's structure and purpose ,rather than its physical appearance on a page .Due to formatting differences resulting from the use of UL's new electronic publishing system ,please note that additional pages ( onwhich no requirements have been changed )may be included in revision pages due to relocation of existing text and reformatting of the Standard Text th...
UL 508-2008 UL Standard for Safety for Industrial Control Equipment.pdf
