Conductor Sizing & Derating

Course Description

This 8-hour course provides participants with a chance to become familiar with ampacity and the tables in Article 310 and how to properly apply correction and adjustment factors. Once they have appropriately applied the derating values, participants will work on selecting the correct wire size, type, ampacity, temperature, and voltage rating. Lastly, this course discusses the importance of voltage drop on new installations and how to calculate for it. Supplemental handouts included in cost of course.

Continuing Education Credit

This course has been approved by Washington State Labor & Industries for:

  • Electrical Trainees
    • 8 hours Basic Classroom Training
    • Course #: WA2023-106
  • Journey-level Electricians, Electrical Administrators & Master Electricians
    • 8 hours Industry Related
    • Course #: WA2023-106
  • Plumbers & Plumber Trainees
    • 8 hours Industry Related Electrical
    • Course #: WA2024-121

This course has been approved by State of Idaho Division of Building Safety for Electricians.

  • 8 hours Industry Related
  • Course #: 20-1001538

Class Times

  • 8:00AM – 5:00PM

Required Books/Materials

  • 2020 or 2023 NEC Code Book
  • Calculator
  • Paper
  • Pen/Pencil


Classroom Information