In general, these symbols are intended for use on one line diagrams of multiphase alternating- current systems, or on complete wiring ... which were as follows: I.E.C. Document R.M. 38; N.E.L.A. Publication 256-19, 1926; Report of Special Committee on Engineering Symbols, A.E.R.A. 1926; Apparatus Handbook, N.E.M.A. 1928; Conventional Signs for Car and Locomotive Wiring Diagrams (Standard No.
|Title||:||Industrial Standardization and Commercial Standards Monthly|