Generators, transformers, etc., to be grounded.

The frames and bed plates of generators, transformers, compensators, rheostats and motors installed underground shall be effectively grounded. All metallic coverings, armoring of cables, other than trailing cables, and the neutral wire of three-wire systems shall also be so grounded.[ 1941 c 194 s 26; Rem. Supp. 1941 s 7666-34.]