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Motor Calculations: From FLA to the Licensing Exam

A topic that shows up on journey-level and master licensing exams.

Motor calculations show up on most licensing exams. Learn the FLA → conductor → OCP → disconnect path until it's automatic.

0% complete · 0/5 lessons · 0/5 quizzes passed

What you'll learn

  1. Module 1
    Full-Load Amperes (FLA)
    Table 430.247 / 248 / 249 / 250. Never use nameplate for conductor sizing.
    1 lessons · 4 questions
  2. Module 2
    Branch Circuit Conductors — the 125% Rule
    430.22: conductors sized at 125% of table FLA.
    1 lessons · 4 questions
  3. Module 3
    Motor Overcurrent Protection (OCP)
    430.52 and Table 430.52 — inverse-time 250%, dual-element fuse 175%, instantaneous trip 800%.
    1 lessons · 4 questions
  4. Module 4
    Motor Disconnect and Controller
    430.102 disconnect requirements; controller must break locked-rotor current.
    1 lessons · 3 questions
  5. Module 5
    Full Motor Circuit Calculation — Exam Drill
    HP + voltage → FLA → conductor → OCP → disconnect, until it's automatic.
    1 lessons · 4 questions