How to Plan Wiring for a Woodshop 

its a personal preference.. No code on which side its installed for residential, Personally I like my ground down just for the look I know most people agree with that

Unless a project's specifications call for the ground facing up (a hospital would, as would critical government spaces) there is no requirement to oriented it either way. The other thing some of us feel strongly about is that receptacles mounted horizontally should always have the neutral terminal facing up. ;)

That is not accurate. There is no prohibition in CA against multi-wire circuits. However there are several reasons they have fallen out of favor - chief among them is that multiwire circuits require that the OCPD disconnect all of the ungrounded circuit conductors associated with the circuit. That means you're going to have poor selectivity if one of the ungrounded circuit conductors opens on an overload or short circuit, as all of the other breakers associated with the circuit will open as well. It also makes LO/TO for servicing a branch circuit cause the electrician to take down the adjacent circuits for the same reason. The other reason multi-wire is not as popular anymore is that it has limited use in dwelling units in light of the newer requirements for AFCI protection. Since AFCI protection is normally provided at the loadcenter, the downstream circuit conductors must be 2-wire in order to operate correctly. None of these circumstances are unique to California. When the Code is followed (as well as NFPA 70E for lock out, tag out), multi-wire circuits are no less safe than any other type of circuit. But they are probably more trouble than they are worth most of the time.