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A certain vintage of Apple adapters have plastic posts where the ground would otherwise attach. This image is iPad 10W adapters, but the same follows for some older iBook/MacBook chargers:

https://qph.ec.quoracdn.net/main-qimg-05fa7f5f0e6ce0dc43bf8c...



Double insulated appliances are fine, the circuit just needs to be designed with double insulation in mind.




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