Ferrite Transformer

[alok1982]

How to choose the SWG (wire gauge) for Electronic (ferrite) Transformer?

 

[MikeMl]

Wire size is based on how many wire turns will fit the core aperture, and on (I^2)R losses.

 

[crutschow]

It's determined by the power the transformer must handle. From that you pick a core size and then wire size based upon the number of turns needed and resistive losses as Mike stated. Sometimes it's somewhat of a iterative process.

 

[chemelec]

For a Transformer, Many Wire Charts will tell you the Wire Gauge Based on the Current at 700 Mils circular area per Ampere.
(A Mil is 1/1000 of an Inch.)

http://chemelec.com/Projects/Wire/Wire-1.png

 

[ChrisP58]

If it's a high frequency switching transformer, you will also need to consider skin and proximity affects in your choice.

 

[MOR_AL]

Try this excellent book
TRANSFORMER AND INDUCTOR DESIGN HANDBOOK
COLONEL WM. T. MCLYMAN

 

[dr pepper]

You can reduce skin effect by wither using litz wire or by using 3, or 4 or more thinner wires instead of one thick one.