The USA version was also published in 2006, but unlike 2nd edition, not by UL. It is published by the American Association for Medical Instrumentation (AAMI) and appears as ANSI/AAMI ES60601_1:2006. Canada published the standard in 2008 as
CAN/CSA60601:2008. Engineers need to be aware that, when using these standards, there are a number of key dates specified for the implementation of the 3rd edition, and that these vary by region.