TL;DR

Learn residential electrical installation requirements including dwelling unit load calculations. Residential wiring is a core competency for electricians and heavily tested.

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

Free Multi-Family Dwelling Calculations Practice Questions

Master Electrician License Exam · Advanced Calculations

This module covers Multi-Family Dwelling Calculations as part of the Advanced Calculations section, testing your understanding of core concepts and their practical application.

Exam	Master Electrician License Exam
Pass Rate	45%
Duration	300 minutes
Module	Multi-Family Dwelling Calculations

Why Multi-Family Dwelling Calculations matters

Multi-Family Dwelling 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 10-unit apartment building has each unit at 1,000 sq ft with two small-appliance circuits, one laundry circuit, and an 8 kW electric range. Using the standard method, what is the total lighting/small-appliance demand load for all 10 units combined? (Table 220.42)

27,150 VA
72,000 VA
45,000 VA
25,200 VA

2. A 50-unit multifamily building is served at 208Y/120V, 3-phase. Each unit has a total connected load of 12 kVA. Using the optional method with a 29% demand factor for 50 units, plus 25 kVA of house loads, what is the minimum service ampacity?

531 amperes
1,667 amperes
483 amperes
920 amperes

3. A 30-unit apartment complex uses the optional calculation method (NEC 220.84). Each unit has a connected load of 15 kVA. The demand factor for 30 units per Table 220.84 is 33%. Common-area house loads total 20 kVA. What is the total building demand?

168.5 kVA
450 kVA
148.5 kVA
195 kVA

Want more practice like this?

Start practicing free →

4. Per NEC Table 220.42, for multifamily dwellings the lighting demand factor for the portion of the total connected lighting load from 3,001 VA to 120,000 VA is what?

35%
100%
50%
25%

5. When calculating a multifamily service load, house loads (common areas) are added to the total at what demand factor?

100% — no demand factor reduction is permitted for house loads
50% of the connected house load
75% of the connected house load
35% of the connected house load

Ready to practice for the Master Electrician License Exam?

Adaptive practice powered by Item Response Theory targets your weak areas. Start with 3 free sessions.

Start free practice →

Frequently Asked Questions

How many Multi-Family Dwelling Calculations questions are on the Master Electrician License Exam?▼

The Advanced Calculations section, which includes Multi-Family Dwelling 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 Multi-Family Dwelling 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 Multi-Family Dwelling 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.