Chapter 3 – Wiring Methods and Materials

1 Chapter 3 Wiring Methods and MaterialsArticle 300 Wiring Methods .. Against Physical Against Exposed to Different Permitted in Electrical Securing and Mechanical Splices and Length of Free Boxes or Conduit Bodies Raceway Inserting Conductors in Supporting Conductors in Vertical Induced Currents in Metal Spread of Fire or Products of Ducts, Plenums, and Air-Handling Panels Designed to Allow Access243 Article 310 Conductors For General Wiring .. in Size Insulation Temperature Conductor Conductor Conductor Ampacity249 Article 312 Cabinets, Cutout Boxes, and Meter Socket Enclosures.

2 , Wet, or Hazardous (Classified) in for Raceway and Splices255 Article 314 Outlet, Device, Pull and Junction Boxes, Conduit Bodies, and Fittings .. Conduit Damp, Wet, or Hazardous (Classified) Number of 6 AWG and Smaller Conductors in Boxes and Conduit Conductors Entering Boxes or Conduit Boxes Installed in Walls or Gaps Around Surface Supports of Boxes and Conduit Covers and Outlet Pull and Junction Boxes and Conduit Bodies for Conductors 4 AWG and Wiring to be Accessible266 Article 320 Armored Cable (Type AC).

3 Uses Uses Not Exposed Through or Parallel to Framing In Accessible Attics or Roof Secured and Boxes and Conductor Grounding272 Article 330 Metal-Clad Cable (Type MC) .. Uses Uses Not Through or Parallel to Framing In Accessible Attics or Roof Securing and Conductor Grounding276iiContentsUnderstanding the National Electrical Code - 2002 EditionMike Holt Enterprises, Inc. 334 Nonmetallic-Sheathed Cable (Types NM and NMC).. Uses Uses Not Through or Parallel to Framing Attics and Roof Secured or Ampacity282 Article 336 Power and Control Tray Cable (Type TC).

4 Uses Uses Not Permitted284 Article 338 Service-Entrance Cables (Types SE and USE).. Uses Bends287 Article 340 Underground Feeder and Branch-Circuit Cable (Type UF) .. Uses Uses Not Ampacity289 Article 342 Intermediate Metal Conduit (IMC).. Uses Dissimilar Number of Conductors291 Number of Bends (360 ) Secured and Couplings and Bushings293 Article 344 Rigid Metal Conduit (RMC) .. Uses Dissimilar Number of Conductors295 Number of Bends (360 ) Secured and Couplings and Bushings297 Article 348 Flexible Metal Conduit (FMC).

5 Uses Uses Not Number of Number of Bends (360 ) Secured and Grounding301 Article 350 Liquidtight Flexible Metal Conduit (LFMC) .. Uses Permitted Uses Not Number of Number of Bends (360 ) Secured and Grounding304 Article 352 Rigid Nonmetallic Conduit (RNC) .. Uses Uses Not Number of Number of Bends (360 ) Secured and Expansion Grounding309iiiUnderstanding the National Electrical Code - 2002 EditionContentsMike Holt Enterprises, Inc. 354 Nonmetallic Underground Conduit with Conductors (NUCC).

6 Uses Uses Not Bends Number in One Conductor Terminations312 Article 356 Liquidtight Flexible Nonmetallic Conduit (LFNC) .. Uses Uses Not Number of Number of Bends (360 ) Secured and Grounding315 Article 358 Electrical Metallic Tubing (EMT) .. Uses Not Number of Conductors318 Number of Bends (360 ) Reaming and Secured and Coupling and Connectors319 Article 362 Electrical Nonmetallic Tubing (ENT) .. Uses Uses Not Number of Number of Bends (360 ) Secured and Grounding324 Article 376 Metal Uses Uses Not Conductor Maximum Conductors Maximum Wireway Splices and Taps327 Article 378 Nonmetallic Wireways.

7 Uses Uses Not Conductor Maximum Conductors Maximum Wireway Expansion Splices and Grounding330 Article 380 Multioutlet Assembly .. Partitions332 Article 384 Strut-Type Channel Raceway .. Uses Uses Not Conductor Maximum Number of Securing and Splices and Grounding335 Article 386 Surface Metal Raceways .. Uses Uses Not Size of Number of Conductors Splices and Separate Compartments338ivContentsUnderstanding the National Electrical Code - 2002 EditionMike Holt Enterprises, Inc.

8 388 Surface Nonmetallic Raceways .. Uses Uses Not Size of Number of Splices and Separate Compartments340 Article 392 Cable Trays .. Not the National Electrical Code - 2002 EditionContentsMike Holt Enterprises, Inc.