IEEE: Tables from Nesc 1987 Ed (ANSI

Illumination Levels; Clearance from Live Parts; Working Space; Electrical Equipment Classified Areas: Flammable Liquid Storage Areas; Bulk Plants; Gasoline Dispensing Stations; LPG Storage; Natural Gas (Methane Areas); Vertical Clearance of Wires, Conductors and Cables Above Ground, Rail or Water Surfaces; Vertical Clearance of Rigid Live Parts Above Ground or Roadway Surfaces; Reference Heights; Electrical Component of Clearance in Rule 232D3a; Vertical Clearances of Wires, Conductors and Cables in Rule 233C3b(1); Clearance of Wires, Conductors and Cables Passing by but Not Attached to Building and Other Installations Except Bridges; Clearance of Supply Conductors and Cables from Bridges.