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Now if the same thing happened with a single rail +400 volt power supply, the shock would be four time worse, as the danger is equal to the voltage squared.
The last advantage to a split rail power supply is that it allow for some of the noise canceling tricks that I am so fond of in this journal and in the GlassWare website's Circuit of the Month articles. Look carefully at the two resistors and one capacitor network that serves as the common cathode resistor for the Differential amplifier at the input of the circuit below. It is required to inject more negative power supply noise current into the Differential amplifier so that the noise at the plate will be cancelled.
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