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.

--
Jim Mueller

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