You can calculate the voltage drop of the wire in
your secondary with
the heap of a wire table.http://www.powerstream.com/Wire_Size.htm


Hey OM:

That link to that table is ok. I learned building my own transformers.
Heat is the killer of any design.

What those tables don't tell you is the resistance increase caused by
heat which turns out to be run away in cases. It's like the resistance
goes up because of heat and this creates more heat increasing the
resistance further.

Leave a fudge factor in there, use the largest size wire possible

73 OM
de n8zu.