I must admit to finding earthing terminology confusing, probably because I get involved with it on an infrequent basis. Reference is generally back to EN 60950 to check. I don't have a copy of EN 60335 but would be surprised if it was really different from EN 60950.
The "Protective Earth Ground" is marked by the symbol 60417-5019, the one enclosed in a circle. This is used for "connecting a main protective earthing terminal to an earth point in the building installation." This is the terminal normally used for the green/yellow lead of the mains input lead and should only have a single connection. In the event of there being the option of more than one mains input, redundancy for example where separate power supplies are connected to independent sources, each input should have an associated "Protective Earth Ground" terminal. So it is possible to have more than one terminal but each should only have a single connection. All other earth ground points can be marked with symbol 5017, the one without the circle, and more than one "Protective Bonding Conductor" can be fixed to each point provided they are attached according to the standard. Hope this helps, Neil Helsby ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
