Anchor cable supports to the building structure above the ceiling, never to the ceiling grid or tiles. Use listed J-hooks at 4 to 5 foot intervals. Cable trays: Cable rails are flat structures that. Adding new wiring for lighting, speakers, or data lines often requires navigating the hidden spaces above a finished ceiling. For example, with a new ceiling fixture using a source from an existing wall receptacle, the cable will have to be run inside the wall cavity, through the top plate, into the ceiling cavity, and on to the new fixture. Or if you are. Cables should be run along the ceiling void or under the floor to a point directly above or below the switch or appliance outlet and never run diagonally across walls to reach the switch. I think I have a decent handle on. Top of the wall – where the wall meets the ceiling there is a 150mm zone where cables should be run.
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