UL

Underwriters Laboratories Inc.

http://www.ul.com/(其他窗口)

VDE

VDE Association for Electrical, Electronic & Information Technologies

http://www.vde.de/(其他窗口)

CSA

Canadian Standards Association

http://www.csa.ca/(其他窗口)

NEMKO

Norges Elektriske Materiellkontroll

http://www.nemko.com/(其他窗口)

Bsi

British Standards

http://www.bsi-global.com/(其他窗口)

TUV

TUV Rheinland Berlin Brandenburg

http://www.tuv.com/(其他窗口)