Sponsored Content: Global harmonization of the appliance coupler standard
SCHURTER IEC 60320 connectors with V-Lock cord retention system
The IEC 60320 appliance plug standard represents a worldwide valid standard. Global standards make it easy for both component and device manufacturers to evaluate guaranteed suitable sockets and plugs. So you can be sure that the plug from the European manufacturer A will also work without problems with the socket from the Asian supplier B. Beyond that the safety is examined against electrical impact just like against fire.
Harmonization with IEC 60320
The lower mains voltage level in North America resulted in the USA and Canada using their own national standards for appliance plugs. In the USA, the UL 498 standard for device plug approvals was used, in Canada CSA C22.2 no. 42.
For some years now, there has been a general trend among UL (Underwriters Laboratories) to largely adapt IEC standards. The advantages of such harmonization are obvious: For example, the effort required to administrate and maintain the standard can be minimized; a combination of approvals and the corresponding certificates (UL + CSA) can be realized; in addition, UL opens up an additional source of income by offering IEC approvals in its function as a testing laboratory.
Applicable standard for appliance plugs in North America
The first publication of the new standard “UL 60320” took place in May 2011. Ten years later, in May 2021, all new appliance plugs in North America will have to comply with the new standards. Correctly, these are then called “UL 60320-1” or “CSA C22.2 no. 60320-1”.
On the product itself, the UR and CSA test marks are then combined to form the joint cURus. The rating labels are adapted and – where necessary – individual improvements are made to the product itself to optimise the temperature behaviour.
Allowed rated current according to the new UL standard for the respective connector types
Deviations UL 60320 from IEC 60320
You shouldn’t be misled by the number “60320”. The two standards are not identical, but UL is strongly based on IEC. Hence the designation. National deviations for UL 60320 refer to the old IEC standard IEC 60320-1, Ed. 2.
Challenges for suppliers
This change naturally poses a number of challenges for the manufacturers of appliance plugs. For example, the entire range of appliance plugs must be completely re-approved.
Since the temperature heating tests in the UL version are associated with higher requirements (e.g. 18.75 A for C13 connector), this can result in changes to the product itself (e.g. adapted conductor diameter).
In addition, many product labels (test marks, ratings) must be changed, which necessitates tool adjustments in production.
This means a lot of effort on the part of the component manufacturers. However, SCHURTER reacted early and is already prepared for May 12, 2021. All SCHURTER connectors – except for a handful – already comply with the new North American standards.
Deviations UL 60320 from IEC 60320
Content: SCHURTER