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The cables should still have something over them, capping, tube or the like
Depends, the capping or oval conduit is more to keep the plasterer from damaging the cables with their trowel.
One builder I sometimes work alongside, prefers to avoid capping as it tends to bulge and can lead to thin patches of plaster. But his guys are careful and can work with cables just clipped to the bricks/blocks without damaging them.