21.0.0 Common Electrical Terminology

21.1.0 Conductor Properties (AWG Size 18 to 2000)

Reprinted with permission from NFPA 70 1996, the National Electrical Code National Fire Protection Association, Quincy, Massachu- setts. National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Inc, Quincy, Ma 02269

21.2.0 Maximum Number of Conductors in Trade Sizes of Conduit or Tubing THWN, THHN Standard Conductors

21.3.0 Percent of Cross-Section of Conduit and Tubing for Conductors

Reprinted with permission from NFPA 70 1996, the National Electrical Code National Fire Protection Association, Quincy, Massachusetts. National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Inc, Quincy, Ma 02269

21.4.0 Maximum Number of Concentric Stranded Conductors in Trade Sizes of Conduit or Tubing (RHW and RHH Conductors with Outer Covering)

Reprinted with permission from NFPA 70 1996, the National Electrical Code National Fire Protection Association, Quincy, Massachusetts. National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Inc, Quincy, Ma 02269

21.5.0 Dimensions of Rubber- and Thermoplastic-Covered Conductors

Reprinted with permission from NFPA 70 1996, the National Electrical Code National Fire Protection Association, Quincy, Massachusetts. National Electrical Code and NEC are registered trademarks of the National Fire Protection Association, Inc, Quincy, Ma 02269

21.6.0 Maximum Number of Conductors in Trade Sizes of Conduit or Tubing for TW, XHHW, RHW Conductors

Reprinted with permission from NFPA 70 1996, the National Electrical Code National Fire Protection Association, Quincy, Massachusetts. National Electrical Code and