On Mar 3, 7:39*pm, Jim Mueller wrote:
On Sat, 02 Mar 2013 20:00:49 -0800, Frank wrote:
Clamshell-looking enclosure on small AC power transformers. *Magnetic
shielding to prevent interference with nearby wires?

Magnetic fields are hard to shield. *In a power transformer, it would be
more effective to use more iron in the core and more turns in the
windings to reduce the flux density. *While a steel shell probably
provides a limited amount of shielding, it's more likely there to provide
mechanical protection. *At the same time, it gives a better appearance.

Surprised no one's made them gold plated.