I strongly agree, specially where we are talking about buildings where normal (untrained) people work.Bottom line: I believe floating 480V networks should be unlawful to install due to the safety issues.
What industry are you talking about where Delta connections are considered the "workhorse"? I don't think this statement has been true for at least 50 years now. For most factories, industrial, and commercial uses, a grounded Wye system is closer to being the workhorse in the US.The DELTA power system design has been the workhorse of the industry for years, but it also has its draw backs:
The only place where I know that using an ungrounded Delta connection makes any sense at all is for utility transformers feeding pole lines. These are only serviced by highly trained electricians, and it is important that the first ground (tree limb brushing the line) does not necessarily take out the power line.
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