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Too right I'm confused. The question isn't specifically about SWA but taking that as an example, if there were a phase to armour fault that would be picked up even if the armour were not connected to earth.
OK,so if you expand this notion to any other cable,the reasons for earthing that particular conductor,during that particular test,are obvious.
Another reason,if one was needed,for earthing the armour on SWA during an IR test,would be that even if the armour only provided mechanical protection,an indication of it's integrity,that is to say,how the outer sheath may be providing prevention of moisture,rust,etc,in relation to the environment (earth) is also tested.
I still have not heard the counter debate,from the OP,of why the other side of this argument,feel it is not necessary...