The cells of storage batteries shall be supported by suitable insulators, except small cells of insulating material. Suitable drainage or other means shall be provided beneath cells to prevent the accumulation of electrolyte in case of leakage or spraying. Acid resistive floors, such as vitrified brick, set in pitch, are recommended where large batteries are installed.
34 Pa. Code § 39.124
This section cited in 34 Pa. Code § 39.85 (relating to general requirements); 34 Pa. Code § 39.121 (relating to applicability); and 34 Pa. Code § 39.201 (relating to storage batteries, transformers, and lightning arresters).