Dead Man’s Switch – The Electrical One…

While a Google search of “dead mans switch” brings with it a host of interesting non-engineering references, we concern ourselves today with the ones related to the more pedestrian and technical meaning:  Operator Presence Detection. The phrase “Dead Man’s Switch” was originally coined by engineers at the turn of the century who were running electric streetcars and trains. These devices do pretty much what the name implies: they prevent a disaster if the equipment operator suddenly

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