I'm suprised that the US never took up the European DIN Rail mounting system.
Mind you the idea of having something European installed in America was probably the biggest stumbling block.
It uses Metric sizes, not the Imperial that most people are used to.
DIN Rail devices have been common-place here in New Zealand for years and are a lot easier to fit and replace.
The most commonly used "Top-Hat" for breakers and such gear is a bloody good idea.
"G" profile is distained by Industrial Electricians the country over, especially when you get them stupid terminal blocks fall off their rail when trying to tighten them.
Top-Hat is a lot more reliable, in that respect.

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[This message has been edited by Trumpy (edited 05-05-2006).]