Each battery charger enclosure must meet Sec. 111.01-9. Additionally, each charger must be suitable for the size and type of battery installation that it serves. Chargers incorporating grounded autotransformers must not be used. Except for rectifiers, chargers with a voltage exceeding 20 percent of the line voltage must be provided with automatic protection against reversal of current. [CGD 94-108, 61 FR 28278, June 4, 1996; 61 FR 36787, July 12, 1996]
Subpart 111.20_Transformer Construction, Installation, and Protection