"Geoff C"
** Your question is far too vague.
AS3108 gives " Distances through insulation between input and output
circuits." ( which applies to a transformer ) as being a little as
0.1mm ( ie 4 thou) for a 250 volt AC supply.
The VA rating of the transformer come into the figure as does the type
of insulation used.
How about you ask for the info you are really after?
....... Phil
OK. I do not have access to the standard but will attempt to describe.
Transformer is mains and approx 300VA peak, 150VA average with multiple
secondaries, elecrostatic screen and 120/120 primary for international
voltages. Max secondary winding is 285 volt.
Centre leg 40x73mm, stack height 53 mm. Inter winding insulation is mylar
tape, (the yellow stuff) with elephantide type wrap. I am evaluating a
new supplier of this tranny and would like to give the go ahead to the
manufacturer for an initial run if it is OK. I will do hi-pot testing
after I unwrap and check construction. I would like to know the legal
requirement for the creepage distance from primary to secondary winding.