Re: Isolator Transformer Query
There are lots of different applications for isolating transformers, and in some of them it's necessary to earth one side of the secondary, some it's useful to earth a centre tap on the secondary, and in others it's absolutely essential *not* to earth any part of the secondary.
There's no "one size fits all" best way to do it. The only way to determine how the earthing should be done is to have a clear understanding of what the isolating transformer is to achieve, and the environment and electrical safety regime it's to operate in. It's impossible, and indeed potentially dangerous, to make a blanket statement of "this earthing arrangement is best".
Chris
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