Consider a C14 appliance coupler. Inside, the product is Class II. Nothing is connected to the PE terminal inside the product. Is the product Class I or Class II?
>From the outside, the product appears to be Class I because it has a C14 >appliance coupler. So, it is Class I. If the product has a PE terminal, it >is Class I. Virtually all Class I products are a combination of Class I and Class II. Even metal-enclosed products. Consider (again) the C14 appliance coupler. The inside mains terminals are 6 mm from the PE terminal. This dimension exceeds the distance required for basic plus supplementary clearance (air) insulation (or reinforced clearance insulation). For a C14 appliance coupler, the mains terminals are Class II construction. And, if you evaluate the mains circuits in a product, you will find that most of the mains circuits are Class II with respect to accessible parts and SELV secondary circuits. Our safety standards for Class I construction ignore the fact that Class II construction is also in the product. Best regards, Rich - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
