The O and I are intended to indicate the state of the switch (off or on), not its purpose. Multiposition switches can also be labeled with further states like O I 2 3... (that's where the O and I came from). There are many similar labels for pushbutton, standby and similar operations in IEC 60417. The function of the switch should also be labeled or otherwise clear. You are not assured all switches labeled O or I are disconnect switches, nor is the label O or I reserved for the purpose. They may even control software functions. In many cases, the disconnect function is served by the inlet connector and not by a single pole power switch even though it is labeled O and I.
Bob Johnson ITE Safety - 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: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
