An extendable hanger apparatus to which or through which an electrical feed can be connected includes a support base, the support base has a containing groove and at least one support posts. Locating devices and a fastening component are provided on the containing groove, the locating devices configured to fixing the support base on a fixed structure, and fastening components are installed at the two end portions of the support base. The fastening components are configured to enable chaining, and the support post has a support component, the support component is configured to connect with an object for hanging.