An electrical
junction box is a container for electrical connections, usually intended to conceal them from sight and deter tampering. A small metal or plastic junction box may form part of an
electrical conduit or
thermoplastic-sheathed cable (TPS) wiring
system in a building. If designed for surface mounting, it is used mostly in ceilings, under floors or concealed behind an access panel - particularly in domestic or commercial buildings. An appropriate type (such as that shown on the right) may be buried in the
plaster of a wall (although full concealment is no longer allowed by modern codes and standards) or cast into
concrete - with only the cover visible.