UL

Underwriters Laboratories Inc.

http://www.ul.com/

VDE

VDE Association for Electrical, Electronic & Information Technologies

http://www.vde.de/

CSA

Canadian Standards Association

http://www.csa.ca/

NEMKO

Norges Elektriske Materiellkontroll

http://www.nemko.com/

Bsi

British Standards

http://www.bsi-global.com/

TUV

TUV Rheinland Berlin Brandenburg

http://www.tuv.com/