Rick,
If you are using IEC950 you can mark the switch I/O, if you are using IEC60065 you are only allowed to mark a single pole switch with the "I" (on) symbol.
Ed
>From: "Rick Linford"
>Reply-To: "Rick Linford"
>To:
>Subject: EN60950 (UL1950, IEC 60950) On off switch marking.
>Date: Fri, 27 Apr 2001 10:25:19 -0600
>
>
>Hi All,
>
>When a switch opens only one leg of the mains to control power to
>equipment should it be marked with the "l" and "O"?
>
>Background:
>
>Three different engineers from three different NRTLs indicated it is
>permitted, two even required it. A different engineer for one of the
>NRTLs and two other respected individuals indicate it is prohibited. It
>will be interesting if members of this list will have the same 50/50
>split or if there is a correct answer.
>
>(single phase 100 to 240 VAC, 2A, 50-60 Hz, intended to be shipped US,
>Canada, EU and generally internationally)
>
>To help, IEC 60950 (1999), section 1.7.8.3 Symbols, is shown below.
>
>Where symbols are used on or near controls, for example switches, push
>button, etc., to indicate "ON" "OFF" conditions, they shall be the line
>l for "ON" and the circle O for "OFF" (60417-1-IEC-5007 and
>60417-1-IEC-5008). For push-push type switches the symbol {line in side
>the circle} shall be used (60417-1-IEC-5010).
>
>It is permitted to use the symbols O and l to indicate the "OFF" and
>"ON" positions of any primary or secondary power switches, including
>isolating switches.
>
>A "STAND-BY" condition shall be indicated by the symbol {line breaking
>the circle at the top} (60417-1-IEC-5009).
>
>My bias was not included in the 50/50 statistics noted above but I
>believe it is required.
>
>Rick Linford
>Regulatory Engineer
>SonicWALL
>
>
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