OPEN WIRING ON INSULATORS


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OPEN WIRING ON INSULATORS
OPEN WIRING ON INSULATORS45. Open wiring on insulators is one of the cheapest methods of installing wiring. It finds application in factories and mills for the installation of feeder circuits in places where appearance is of little consequence. The wires may contain rubber or thermoplastic insulation. Smaller wires must be supported at least every 1.4 m (4½ ft). Conductors 8 AWG and larger may be run across open spaces and supported at distances not greater than 4.5 m (15 ft) if approved noncombustible, nonabsorptive insulating separators providing not less than 65 mm (2½-in.) separation between conductors are installed at intervals of not over 1.4 m (4½ ft). For mill construction in locations where the conductors are unlikely to be disturbed, conductors 8 AWG and…
Citation
Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. OPEN WIRING ON INSULATORS, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export