Re: The wonders of having a metal phone body
As the charger is only designed to deliver a few volts, and almost any plug you think of has the zero/earth on the outer shell of the plug, a metal casing should be perfectly safe. An old-fashioned charger with transformer would insulate the low voltage circuit completely from mains, and is therefore the safer option. However, with copper prices the way they are, and the weight and bulk of a transformer, most supplies are now switching power supplies, in which there is a potential conductive path from mains to low voltage. Properly designed, there should be fail-safes that should prevent accidents happening. In cheap replacements, these can apparently fail. So while I can understand why phone designers can get metal casings approved, a plastic case would provide an extra fail-safe. Not buying dodgy chargers is another.