Underwriters Laboratories (UL) develops minimum safety standards for commercial electronic products in the U.S. Some states have made these standards legal requirements, though most are voluntary. UL does not "approve" equipment or systems, because this may be construed as a recommendation. Instead, it "recognizes" components and power supplies, and "lists" systems and end use equipment. The more common UL standard related to power supplies is, UL 1950 - Safety of Information Technology Equipment. The Canadian Standards Association (CSA) is the governing safety standards organization in Canada, and compliance is mandatory. The CSA standard for electronic equipment (CSA 22.2) is very similar to UL 1950. Under agreement, UL 1950 references CSA 22.2 in its test reports, and CSA accepts UL's findings as compliant. Two of the more common CSA standards related to power supplies are:
1) C22.2 No. 950 - Safety of Information Technology Equipment 2) C22.2 No. 234 - Power Supplies
The International Electromechanical Commission (IEC) is a group of technical committees from member countries, including the U.S., which based on consensus of opinion, publishes specifications for varying subjects. It is recommended that the National committees adopt these standards. The specification published by IEC of interest to power supply manufacturers is:
IEC 950 - Safety of Information Technology Equipment including Electrical Business Equipment
German Safety Laws are internationally recognized electrical standards highly regarded throughout Europe and the rest of the world. Both VDE and TUV are authorized to test and certify products to these standards. The common standard related to power supplies is:
IEC 950/EN60950 - Safety of Information Technology Equipment including Electrical Business Equipment (Formerly VDE 0806)
Most of Astrodyne products are certified to applicable UL, CSA, and IEC/TUV standards. Astrodyne recommends that you refer to the detailed specification sheets provided in downloadable PDF format on this web site for standards information including file certification numbers.