The only thing wrong in the pic, the twin and earth is running on top on the beams. The twin+e is not protected on the beams, any person working in the roof space could damage the wire and expose the live conductors. I am sure you could find a clause in the SANS if you really looked and interpreted it a way to point this out. What you would then do with the info is the part that makes me laugh at this industry. It is like trying to tell a taxi boss his body guards are not allowed to carry full automatic weapons like and AK 47. I dare you to waste the time and energy.