Re: "Elevated ground" Good idea?
One issue is now there is a propensity for plastic enclosures for everything. If inside that enclosure there is mains power, then every metal object projecting to the outer surface, screw heads, connector shells etc, a metal base, the transformer stack (if there is one) must be earthed if the screws project to the outer surface. A loose wire inside connected to phase could touch any of those fittings, a failure in the transformer insulation etc could take the stack high and its mounting screws. This is why , for home made mains apparatus at least, its simply better to use a solid metal enclosure with a good earth bond, but its more expensive.
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