Conductors in battery rooms, if of such material or so located as to be liable to corrosion, shall have suitable protective coverings or coatings, unless the ventilation is such as to render this unnecessary.
34 Pa. Code § 39.127
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).