Hi Richard, just a small comment on your first point: You seem to refer to European traffic signs, where a circle is indeed used for prohibitory signs (https://en.wikipedia.org/wiki/Comparison_of_European_road_signs#Prohibitory). The diagonal line is a variation for prohibitory signs, and its use is different from country to country. Consequently, a circular sign with the letter "P" means parking is not permitted, with or without a diagonal line, in all countries except Ireland. The sign for parking permitted is an indicative sign (https://en.wikipedia.org/wiki/Comparison_of_European_road_signs#Indication), which is a blue rectangle with a white "P" on it (except again for Ireland, which uses the letter "P" in a circle). Anyway, I do not think that this characteristic of traffic signs has been carried over to IEC symbols, but rather believe that the outer circle of IEC symbol 5019 shall symbolise "protection". Regarding the original question: Though "protective earthing terminal" does not have its own definition in IEC 62368-1, this term is used in the definition for "protective earthing conductor" in clause 3.3.11.12: "protective conductor connecting a main protective earthing terminal in the equipment to an earth point in the building installation for protective earthing". The wording of the definition implies that there may be more than one main protective earthing terminal in the equipment. Even if the terminal in question is regarded as "protective bonding terminal", then still clause F.3.6.1.2 on "Protective bonding conductor terminals" already mentioned by Richard is applicable: "Terminals for protective bonding conductors need not be identified. If such terminals are identified, they shall be marked with the earth symbol IEC 60417-5017 (2006-08). However, a component terminal or a terminal for bonding wiring from the appliance inlet already marked with the symbol IEC 60417-5019 (2006-08), is acceptable as identification of a protective bonding conductor terminal." My interpretation of this clause is that an internal terminal that is connected by bonding wiring to a protective earthing terminal of the equipment that is marked with IEC symbol 5019, may also be marked with IEC symbol 5019. Kind regards, Bernd
Von: Richard Nute <[email protected]> Gesendet: Samstag, 9. April 2022 02:44 An: [email protected] Betreff: Re: [PSES] [EXTERNAL] Re: [PSES] Protective Earth Terminal-Protective Bonding terminal -interpretation Hi Ryan: I want to make several points. First. In Europe, a circle around a symbol means the symbol is an imperative; it must (or is permitted to) be done. (A diagonal line through the circle is a negative imperative; it must not be done.) For example, a letter "P" in a circle means parking is permitted, while a diagonal line through the same symbol means parking is not permitted. A terminal with adjacent earth symbol in a circle means this terminal must be connected to earth. Commonly, an IEC 60320 appliance coupler has the mark adjacent to the protective earthing conductor terminal. The connection to earth is through the power cord protective earthing conductor. However, the marking (which is on the inside of the appliance coupler) is not accessible (visible) to the end user of the equipment; he simply connects the power cord with protective earthing conductor to the equipment via the appliance coupler without knowledge of the imperative marking. Second. The protective bonding circuit must be connected to the protective earthing terminal. Though not stated explicitly, sub-clause 5.6.2.1 and 5.4.2.3.3 (first dashed paragraph) imply this requirement. Third. Note that the standard implies that the equipment can have more than one protective earthing terminal. See 3.3.11.12 and 5.4.2.3.3 "... main protective earthing terminal..." 5.6.5.1 "...the earthing terminal in the appliance inlet is regarded as the main protective earthing terminal." 5.7.8 "... a terminal for the protective earthing conductor..." Many other places in the standard use the phrase "a main protective earthing terminal." All protective earthing terminals must include the protective earthing symbol marking. Fourth. F.3.6.1.2: "... a terminal for bonding wiring from the appliance inlet already marked with the symbol , IEC 60417-5019 (2006-08), is acceptable as identification of a protective bonding conductor terminal." I'm not sure what this means. Maybe you can use it. Fifth. These are all internal markings. As such, they are only useful to someone who has access to the inside of the equipment and is servicing the protective conductor system. Regardless of internal markings, the equipment is safe for the end user even though non-compliance with the standard. Sixth. Protective earthing conductors and protective bonding conductors have the same insulation color - green-yellow (5.6.2.2). This means that either end of a green-yellow conductor is (or can be) a protective earthing terminal. An unmarked terminal (of a green-yellow conductor) is a protective bonding terminal, and a marked terminal is a protective earthing terminal. (Presumably, a conductor of any other color connected to either a protective bonding terminal or to a protective earthing terminal is a functional earthing conductor.) I hope you find these comments useful in formulating an argument with your certification houses. Good luck. Best regards, Rich - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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