Control panels safety questions

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Original poster: "Jonathan Peakall by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jpeakall-at-mcn-dot-org>

Hi All,

I am constructing the control panel for my new TC, and of course, I have
some questions:

I want to have two run modes on the controller. One will be a momentary
"dead man" style switch, used for demo purposes. The other mode will be a
continous run mode, so I can do/adjust/whatever while the coil is running,
or if the coil is to be run for periods longer than one wants to hold the
momentary switch. I plan to have a key switch for the main power, and a
second key switch for the continous mode switch. Want I want to do is make
it so that if the continous mode switch is accidentally left on that the
main power switch will not operate, to ensure against operator error. What
would be a good way to achieve this?

Thanks,

Jonathan Peakall