Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 260
en the two outside conductors in a three-wire system where thepotential between the outside conductors is not over 300 volts. Thecleat must hold the wire at least one-half inch from the surface to whichthe cleat is fastened; and in damp places the wire must be held atleast one inch from the surface… … P^g. 22. Iron Rack and Insulators for Large Conductors. Courtesy of General Electric Co., Schenectady, N. Y. cleat and single-wire cleat, respectively. For large feeder or main conductorsfrom No. 4/0 B. & S. Gauge upward, amore substantial form of porcelain insu-lator should be used, such as…
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