The rule requiring identification of electrical ceiling support wires has been expanded.

300.11(A)(2) Nonfire-Rated Ceiling Assembly. Wiring in a nonfire-rated floor-ceiling or roof-ceiling assembly can be supported by independent support wires attached to the ceiling assembly. The independent support wires must be distinguishable from the suspended-ceiling support wires by color, tagging, or other effective means. (click here to see Fig. 11)

Analysis: Identification of ceiling-support wires that are used for electrical equipment was previously limited to those wires that are in fire-resistance-rated ceiling assemblies. In order to distinguish which wires are installed by the electrician and which are installed by the ceiling contractor, this change requires identification of the independent support wires for all ceiling systems, whether the ceiling assembly is fire-resistance rated or not.