I am not certain this is "law".
But i was told the following when installing ours:
Your allowed to rack the sytem, and insert disks (following the guidelines in
http://h20628.www2.hp.com/km-ext/kmcsdi ... 6625-9.pdf)
The techinican prefered to do the cabling on the back chassis, since he had seen several issues with customers cabling them wrong.
And i was _not_ allowed to insert the HBAs into the controllers. Apparently that required a certified Tech.
If its like that in the US i cannot say, but that was what i was told here in Denmark.