Junction box

A junction box consists of the enclosure and a set of terminal blocks or wire connectors. The enclosure and the types of entry and exit points are typically composed of either plastic or metal depending on the environmental considerations of where it will be mounted. These conditions consist of the level of humidity and  presence of dust or gas. The entry and exit points can be a simple knock-out hole or a more robust cable gland. This gland prevents most external environmental conditions from getting inside the enclosure and causing harm to the connections. The entry and exit points can also take the form of the mating side of a connector from a cable assembly to help simplify the connectivity for the field technician or electrician