668-Electrolytic Cells
668.1 Scope. The provisions of this article apply to the installation of the electrical components and accessory equipment of electrolytic cells, electrolytic cell lines, and process power supply for the production of aluminum, cadmium, chlorine, copper, fluorine, hydrogen peroxide, magnesium, sodium, sodium chlorate, and zinc.
Not covered by this article are cells used as a source of electric energy and for electroplating processes and cells used for the production of hydrogen.