Can you tell me please if there are any codes, or standards for the use of secondary safety cabling i.e. aircraft wire for devices mounted overhead to beams or ceilings. I have heard there is a State code in California that if a device weighs more than 8 lb. it must have a secondary safety cable attached to prevent the device falling if it comes unattached. But I cannot find that code or any other that governs these installations of overhead equipment. Thank you very much for any information you can share or point me too.