So they put the big red switch inside a plastic box to stop people accidentally pushing it?

Seems everyone has to have this learning experience

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Rgds
Stephen
(Linux user since kernel version 0.11)

To get a bit more specific, the "protective device" prevents the breaker from being flipped by hand (or falling conduit) unless the device is removed, while still allowing the breaker to trip if necessary. It was also explained that due to the high voltage these particular switches must not be placed within a closed box due to code. The switch(es) are indeed located within a locked service cage.

-Tom