Conductor Selection

Provided by: ToolingU

"Conductor Selection 291" describes the different features of conductors and the considerations involved selecting conductors for electrical wiring applications. Electricians use the National Electrical Code(R) to guide the selection process. Different materials are used to construct conductors. Copper is the most popular choice due to its affordability, low resistance, and good conductivity. Insulation is used to protect conductors from damage and electricians from injury. Wire protection is added to conductors to prevent damage from environmental factors. Correction factors must be considered when selecting a conductor, including ambient temperature, number of conductors, and conductor length. When electricians use the NEC(R) and have an understanding of conductor features and correction factors, selecting appropriate conductors to safely carry power is ensured and essential when working with electrical systems.

Course Objectives:

  • Describe electrical conductors
  • Explain the role of the NEC(R) in conductor selection
  • Describe the systems used to measure conductors
  • Describe conductor materials
  • Describe conductor insulation
  • Describe wire protection
  • Explain how to use Code tables
  • List the factors that affect ampacity
  • Explain how temperature affects ampacity
  • Explain how conductor length affects ampacity
  • Describe voltage drop
  • Explain how the number of conductors used affects ampacity
  • Describe fill limits.

Recommended Background

  • Recommended for mechanical/electrical/plumbing maintenance technicians.

Course ID







Communication, Critical Thinking, Personal Effectiveness, Electricity, Power & Control Electronics, Electrical Wiring

Method of Delivery


Estimated Effort

1.5 hrs



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