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TL;DR

Master electrical load calculations including demand factors and service sizing. Accurate load calculations are essential for safe electrical design and a major exam topic.

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

Free Commercial Load Calculations Practice Questions

Journeyman Electrician License Exam · Load Calculations

This module covers Commercial Load Calculations as part of the Load Calculations section, testing your understanding of core concepts and their practical application.

ExamJourneyman Electrician License Exam
Pass Rate55%
Duration240 minutes
ModuleCommercial Load Calculations

Why Commercial Load Calculations matters

Commercial Load Calculations is one of the most tested areas because medication errors are among the most preventable causes of patient harm.

Sample Practice Questions (5)

1. A commercial building has 30 feet of show window and a sign circuit. The sign circuit is a continuous load on a 20A/120V circuit. What is the combined VA for the show window and sign circuit in the load calculation?

  • 6,000 VA show window + 1,200 VA sign = 7,200 VA
  • 6,000 VA show window + 2,400 VA sign = 8,400 VA
  • 5,400 VA show window + 2,400 VA sign = 7,800 VA
  • 6,000 VA show window + 1,440 VA sign = 7,440 VA

2. A 5,000 sq ft retail store has 40 receptacle outlets, 15 feet of show window, and one required sign circuit (1,200 VA minimum). Per Table 220.12, the lighting load is 2 VA/sq ft for retail. What is the total load BEFORE applying demand factors to the receptacle load?

  • 21,400 VA
  • 18,200 VA
  • 20,400 VA
  • 24,400 VA

3. A 10,000 sq ft office building has 100 duplex receptacle outlets. Per NEC 220.44, what demand factor can be applied to the receptacle load portion that exceeds 10,000 VA?

  • 100%
  • 50%
  • 70%
  • 80%

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4. A commercial workshop has 24 feet of multioutlet assembly where portable tools will be used simultaneously. What is the calculated load for this assembly?

  • 4,320 VA
  • 8,640 VA
  • 2,160 VA
  • 6,480 VA

5. A retail store has 50 general-use duplex receptacle outlets. What is the total receptacle load for the service calculation?

  • 9,000 VA
  • 18,000 VA
  • 25,000 VA
  • 4,500 VA

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Frequently Asked Questions

How many Commercial Load Calculations questions are on the Journeyman Electrician License Exam?▼
The Load Calculations section, which includes Commercial Load Calculations, 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 Commercial Load Calculations?▼
Practice solving calculation problems daily rather than just reading formulas. Work through problems step-by-step, check your units, and time yourself to build speed and accuracy under exam conditions.
What topics within Commercial Load Calculations should I focus on most?▼
Focus on the concepts that appear in our practice questions and any areas where you consistently score below 70%. The adaptive practice mode will automatically target your weak areas for efficient study.