Actually, Chapters 1 through 4 apply to all equipment except as amended in specifically applicable Articles in Chapters 5 through 7. For electrolytic cells, the amendments are in Article 668 [668.3 (C)]. One big amendment is this. Items specifically listed in [668.3 (C) (1)] don't need to comply with Articles 110, 210, 215, 220, and 225, if ...