Here in Phoenix, AZ we run our own grid wires that are painted red to allow the inspector to differentiate our wires from the grid guy's wires. Then we use these,
http://www.erico.com/products/CADDYcfcConduitHangers.asp When using conduit you need to use the #9 wires, which are thicker than the the normal #12 wires. #12 wires are sufficient for running mc cable.
You will need to use these with the #9 wires so you don't bend the grid and it helps to differentiate from the grid guy's wires.
http://www.erico.com/products/CADDYcfcIndElectDrp.asp
