On Tuesday, 28 November 2017 23:08:59 UTC, whit3rd wrote:
On Tuesday, November 28, 2017 at 12:48:01 AM UTC-8, GS wrote:

Commercial isolation transformers get rid of common mode noise, and since
one leg of output is tied to ground, forms a new local neutral.

That's only true of SOME isolation transformers; the ones used for
bench safety when working on live equipment do NOT make the
neutral-ground connection.

quite. And building site transformers earth the centre tap.

Re noise, there's the capacitance...


NT