Jasmine, I believe you are referring to 417-IEC-5172-A, which many refer to as the "Class II" symbol found in the IEC 417 standard. It looks like a square within a square. This symbol is used on "Class II equipment". This term is described in most safety standards such as EN60950. You often see this symbol used on power cubes, drill motors, or other mains powered devices that does not use the protective earth connection (third prong on power plug).
Basically what this symbol means is that the device does not use the protective earth connection as one of the two required levels of protection. The device internally provides two protective levels between all primary wiring and the user/operator. This is usually done through insulators, isolation transformers, plastic cases, etc.. Brian Kunde ----- Original Message ----- From: <[email protected]> To: EMC-PSTC (E-mail) <[email protected]> Sent: Tuesday, August 03, 1999 5:18 AM Subject: IEC Mark 5172 Hi, Wonder can someone please advise on what is IEC Mark 5172 ? [This was written in one of my vendor's UL test procedure] Thanks ! Jasmine --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
