The wiring closet can literally be a closet, such as a converted janitor closet or it can be a small, enclosed area in the corner of a centrally located classroom. Access to all parts of the building through the ceiling should be a consideration. It is desirable, but not necessary, that a separate electrical circuit be available to the telecommunications closet. It is recommended that the wires coming into the wiring closet be attached to the back of a patch panel. Each is numbered to correspond to the wall outlets distributed throughout the building.
Plenum wire is typically double the cost of non-plenum cable.
Safety considerations, as well as building and fire codes, will determine the use of plenum or non-plenum wire. Overhead distribution of the wire is common in school buildings. It is much more convenient, of course, if there is a suspended ceiling. In some instances it may be necessary to drill up through the ceiling. The standards define certain accessibility requirements for ceiling distribution systems.