TY - RPRT TI - Installation and maintenance of electric supply and communication lines safety rules and discussion: comprising part 2, the discussion of part 2, the definitions, and the grounding rules of the fifth edition of the national electrical safety code PY - 1949 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS HB 43 DO - 10.6028/NBS.HB.43 ER -