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Study the assessment and management of eye, ear, nose, throat, and facial emergencies. These specialized assessments require specific knowledge tested on the Journeyman Electrician License Exam.

By Valenke Exam Prep Team·Last updated 2026-06-03

Free Motor Overcurrent Protection (Table 430.52) Practice Questions

Journeyman Electrician License Exam · Motors & Transformers

This module covers Motor Overcurrent Protection (Table 430.52) as part of the Motors & Transformers section, testing your understanding of core concepts and their practical application.

ExamJourneyman Electrician License Exam
Pass Rate55%
Duration240 minutes
ModuleMotor Overcurrent Protection (Table 430.52)

Why Motor Overcurrent Protection (Table 430.52) matters

Motor Overcurrent Protection (Table 430.52) is one of the most tested NEC topics because improper grounding and protection cause electrical fires and fatalities.

Sample Practice Questions (5)

1. A 30-HP, 460V, 3-phase motor has an FLC of 40 amps per Table 430.250. You want to use a dual-element fuse. What is the maximum fuse size, and what is the minimum conductor size (75°C THWN copper)?

  • 70A fuse, 8 AWG conductor
  • 80A fuse, 6 AWG conductor
  • 70A fuse, 6 AWG conductor
  • 60A fuse, 8 AWG conductor

2. A 50-HP, 230V, 3-phase motor has an FLC of 130 amps per Table 430.250. What is the maximum inverse time circuit breaker size? (Standard sizes: ...300, 350, 400)

  • 300 amps
  • 325 amps
  • 350 amps
  • 400 amps

3. A 20-HP, 230V, 3-phase motor has an FLC of 54 amps per Table 430.250. The motor has difficulty starting with the standard 250% inverse time breaker. Per Exception No. 1 (430.52(C)(1)), what is the maximum breaker size? (Standard sizes: ...150, 175, 200, 225, 250)

  • 135 amps
  • 150 amps
  • 200 amps
  • 225 amps

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4. Per NEC 430.52(C)(1) Exception No. 1, if the values from Table 430.52 do not allow the motor to start, the inverse time breaker may be increased up to what maximum percentage of FLC?

  • 300%
  • 400%
  • 350%
  • 500%

5. A 5-HP, 208V, 3-phase motor has an FLC of 16.7 amps per Table 430.250. What is the maximum dual-element (time-delay) fuse size? (Standard fuse sizes: 15, 20, 25, 30, 35, 40, 45, 50, 60)

  • 25 amps
  • 30 amps
  • 35 amps
  • 40 amps

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Frequently Asked Questions

How many Motor Overcurrent Protection (Table 430.52) questions are on the Journeyman Electrician License Exam?▼
The Motors & Transformers section, which includes Motor Overcurrent Protection (Table 430.52), typically represents a significant portion of the exam. Focus on understanding core concepts rather than memorizing exact question counts, as the exam uses adaptive testing.
What is the best way to study Motor Overcurrent Protection (Table 430.52)?▼
Use active recall and spaced repetition rather than passive reading. Practice with realistic exam questions, review explanations for both correct and incorrect answers, and focus on understanding the reasoning behind each concept.
Is Motor Overcurrent Protection (Table 430.52) one of the harder sections on the exam?▼
Yes, Motor Overcurrent Protection (Table 430.52) is considered challenging because it requires applying multiple code articles simultaneously. Practice with scenario-based questions that require you to reference specific NEC requirements.