Why cable glands are used?

In the electrical trade devices that are used to support a cable or conduit entry into an electrical device are called connectors. These can be called strain relief,sealtite, EMT, or BX but they are all called connectors

When the Word gland is used it usually refers to the wiring of explosion proof devices. When making a wire end, the conductors are fed through an empty gland that is twisted on to the end of the explosion proof cable. Into this empty gland is poured a epoxy type compound that hardens itself around the conductors. The hub of the fitting slides over the gland and is screwed into the threaded hole of the device that connects to the cable. By sealing the cable in this method, explosive gasses or dust that might seep into the electrical device is prevented.Pyrotenax, a mineral insulated cable, is one type of cable that uses this method of sealing its cable ends. These type of wire ends are also used with Tech cable that are used in explosion proof areas.