UL 50-2007 用于封闭空间的电动设备标准.pdf

UL 50 Enclosures for Electrical Equipment ,Non-Environmental Considerations UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This PDF Standard downloaded from . . SEPTEMBER 4 .2007 - UL50 Underwriters Laboratories Inc .( UL) 333 Pfingsten Road Northbrook .IL 60062-2096 UL Standard for Safety for Enclosures for Electrical Equipment ,Non-Environmental Considerations ,UL 50 Twelfth Edition ,Dated September 4 ,2007 Summary of Topics This new twelfth edition of ANSI /ULis the result of the harmonization effort to develop a tri-national standard covering requirements for enclosures for electrical equipment .The twelfth edition of UL 50 contains the non-environmental construction ,performance ,and marking requirements for enclosures .The requirements for enclosure construction ,performance ,and markings based on environmental type rating designations have been organized into new standard ,UL 50E ,Standard for Enclosures for Electrical Equipment ,Environmental Considerations . The new requireme...