[Al Skierkiewicz]

I just had to reopen this thread to make an explanation....
The main breaker must be accessible for both you and the field workers. If your robot should take off with a mind of it's own, the field workers will look for the switch to shut it off. If they can't turn it off, they may end up trying to turn it over or some other equally terrible thing to prevent it from injuring anyone. (in the process they are protecting your robot from further damage.) Most inspectors I know will ask you to move it or cut holes in you covers to allow access to the main circuit breaker. Do yourselves a favor now and position the breaker where it is easy to get to.