The provisions of §§ 39.121-39.127 (relating to storage batteries), except for § 39.125 (relating to guarding live parts in battery room), shall apply only to storage batteries exceeding 50 kilowatt hours capacity at the 8 hour rate of discharge.
34 Pa. Code § 39.121
This section cited in 34 Pa. Code § 39.85 (relating to general requirements); and 34 Pa. Code § 39.201 (relating to storage batteries, transformers, and lightning arresters).