Could you clarify what I've read on Google groups?

* For an outbuilding, a separate TT earth is required/recommended,
provided by an earth rod.
* The power itself is provided by a 2 core SWA cable carrying live
and neutral.
* The armour of the SWA is connected to earth.

Is this correct, and to which earth should the SWA armour be
connected, the house, or the garage?
--
Selah