If you mean the arch in a building, generally speaking, electricity is not needed, because it is a building structure and does not involve electrical applications. Arch is a building structure composed of multiple arch members, which can be distributed in various places, such as porches, galleries, courtyards and gardens. Arches are usually made of stone, brick, wood or steel. Many factors need to be considered when making and installing arches, such as the overall style, load, material, size and installation location of the building. However, in some special cases, such as LED lights arranged on arches or door magnetic sensors, power supply may be needed.