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Unsurprisingly the cables are quite safe by design. If you hit it hard with something sharp enough you might get through the outer earth part and through to the line which would result in horrible consequences with death being a very likely outcome and possibly the least painful.
You would need to hit it very hard though.
Airhead
Cool thanks, one big concern is the main electricity cable comes in under and up through these tiles, partly why I don't want to disturb the tiles. Would I need to make some kind of barrier around the cable when doing dpm and compound. I have no intention of touching the cable, it'll be boxed in eventually.