Exam Prep Videos

Short videos on electrician and HVAC licensing exams — how the practice tests work, exam strategy and calculator walkthroughs.

Pass Your Electrical Exam — Free

Pass Your Electrical Exam — Free

Free practice tests for journeyman, master, NEC code, EPA 608, HVAC, NATE and state electrician exams, with explanation…
How It Works

How It Works

Pick your exam, answer the questions, and learn from the explanation and NEC reference for every question. Then retry t…
Journeyman Electrician Exam

Journeyman Electrician Exam

What the journeyman electrician exam looks like, the most-tested NEC topics, and free practice tests with explanations …
Master Electrician Exam

Master Electrician Exam

What the master electrician exam adds over the journeyman exam: service design, three-phase load calculations, transfor…
NEC 2023 vs 2026: What Changed for the Exam 5:05

NEC 2023 vs 2026: What Changed for the Exam

The NEC just moved to a new edition — and some of the article numbers you memorized just changed. In this lesson: Ar…
Conductor Ampacity: Correction & Adjustment Factors 5:18

Conductor Ampacity: Correction & Adjustment Factors

That wire's table ampacity and its real ampacity in your conduit are often two different numbers. In this lesson: Ta…
Box Fill Calculation Step by Step (NEC 314.16) — Exam Prep 5:24

Box Fill Calculation Step by Step (NEC 314.16) — Exam Prep

That overstuffed device box isn't just hard to close — the NEC has an exact rule for it. In this lesson: the box vol…
Conduit Fill Calculation with Chapter 9 Tables 5:31

Conduit Fill Calculation with Chapter 9 Tables

Before you pull one wire, the NEC already caps how full that conduit can be. In this lesson: percent fill by conduct…
Voltage Drop Calculation: Worked Examples 5:32

Voltage Drop Calculation: Worked Examples

The farther the wire run, the more voltage lost — there's an exact formula for it. In this lesson: the voltage drop …
How to Read the NEC Tables Fast 5:05

How to Read the NEC Tables Fast

On exam day, you don't read the code book — you hunt through it fast. In this lesson: the 3 parts of every table, ho…
GFCI and AFCI Requirements 5:41

GFCI and AFCI Requirements

GFCI and AFCI sound alike, get mixed up constantly, and protect against two completely different hazards. In this le…
Emergency, Legally Required & Optional Standby Systems 5:12

Emergency, Legally Required & Optional Standby Systems

A hospital's backup generator and a house's aren't the same to the NEC. In this lesson: Article 700 Emergency (life …
Class 1, 2, 3 Circuits & Fire Alarm 4:56

Class 1, 2, 3 Circuits & Fire Alarm

That thermostat wire is thin because of how little power is on it. In this lesson: how Class 1, 2, and 3 circuits ar…
NEC Code Exams

NEC Code Exams

How the National Electrical Code is organised and article-by-article NEC practice tests with explanations.
EV Charging Equipment 5:14

EV Charging Equipment

EV chargers are everywhere now, and the NEC gives them their own dedicated article: 625. In this lesson: EVSE vs. th…
Solar Interconnection & the 120% Rule 5:01

Solar Interconnection & the 120% Rule

Tie a solar breaker into the wrong spot, and you can overload the busbar. In this lesson: the 120% rule (705.13) wit…
Service Equipment Sizing for A/C Loads: MCA & MOP Explained 5:13

Service Equipment Sizing for A/C Loads: MCA & MOP Explained

That A/C nameplate already has two numbers you need to know. In this lesson: MCA (Minimum Circuit Ampacity, the cond…
Commercial Load Calculation Explained 5:26

Commercial Load Calculation Explained

Commercial load calculations use the same toolbox as a house — different input numbers. In this lesson: occupancy-sp…
Transformer Sizing & Overcurrent Protection 5:10

Transformer Sizing & Overcurrent Protection

A transformer doesn't get protected like a normal conductor — it has its own table. In this lesson: Table 450.3(B) f…
Motor Calculations: FLC, Conductors, OCPD & Overloads 5:30

Motor Calculations: FLC, Conductors, OCPD & Overloads

A single motor circuit isn't one calculation — it's three separate ones, each using a different starting number. In …
Dwelling Load Calc: Standard vs Optional Method (Worked) 5:24

Dwelling Load Calc: Standard vs Optional Method (Worked)

Same house, two completely different, both legal, ways to calculate its service size. In this lesson: the same 2,500…
Services & Feeders in Depth 5:18

Services & Feeders in Depth

Everything from the utility to your main panel is a service — everything after is a feeder. In this lesson: the serv…
Three-Phase Power System Load Calculations 5:17

Three-Phase Power System Load Calculations

Three-phase load calculations use the same Article 220 process — until the last step, where one extra number shows up. …
Hazardous Locations: Seals, Wiring & Equipment 5:25

Hazardous Locations: Seals, Wiring & Equipment

Explosionproof equipment doesn't stop an explosion from happening — it just keeps that explosion from escaping. In t…
Basic Electrical Theory

Basic Electrical Theory

Start with the fundamentals: voltage, current, resistance, Ohm's law, series and parallel circuits, and AC basics. Free…
How to Pass the Journeyman Electrician Exam on the First Try 5:14

How to Pass the Journeyman Electrician Exam on the First Try

Most people fail this exam not from lack of knowledge, but from studying the wrong way. In this lesson: knowing your…
Top 20 NEC Code Sections Every Journeyman Must Know 5:41

Top 20 NEC Code Sections Every Journeyman Must Know

Not every NEC section pulls equal weight on the exam. This is the countdown of the 20 sections that come up again and a…
Grounding & Bonding: Exam Theory Meets Real Panel Wiring 4:41

Grounding & Bonding: Exam Theory Meets Real Panel Wiring

Grounding and bonding get lumped together on the exam, but they do two different jobs — and mixing up the terminology i…
Grounding Electrode System & GEC Sizing 4:26

Grounding Electrode System & GEC Sizing

Every usable grounding electrode on a property has to be bonded into one system — not just the easiest one to reach. On…
Equipment Grounding Conductor Sizing (Table 250.122) 4:46

Equipment Grounding Conductor Sizing (Table 250.122)

The equipment grounding conductor isn't sized from the load or the wire ampacity — it's sized from the breaker. Table 2…
Bonding Jumpers: Main, System & Equipment 4:13

Bonding Jumpers: Main, System & Equipment

Main, system, supply-side, and equipment bonding jumpers all sound similar, but each one has its own location and its o…
Tap Conductor Rules: The 10-ft and 25-ft Tap Rule 4:13

Tap Conductor Rules: The 10-ft and 25-ft Tap Rule

Tap conductors leave their source with no overcurrent protection at that point — and the code allows that under two ver…
Overcurrent Device Selection & Series Ratings 4:32

Overcurrent Device Selection & Series Ratings

Picking a breaker isn't just matching an amp number — the fault current it can handle matters just as much, and series …
Continuous Loads and the 125% Rule 4:51

Continuous Loads and the 125% Rule

A load that runs three hours or more gets its own sizing rule, and that one word, continuous, changes the whole calcula…
Multiwire Branch Circuits Explained 4:31

Multiwire Branch Circuits Explained

Two circuits sharing one neutral sounds simple, but that shared wire creates a safety requirement most people overlook …
HVAC Certification

HVAC Certification

HVAC practice tests built around real service calls: heat pumps and AC, controls and sensors, ladder diagrams and basic…
EPA 608 Certification

EPA 608 Certification

EPA Section 608 certification is required to buy or handle refrigerant. The sections, the passing score, and free pract…
NATE Certification

NATE Certification

How NATE certification works: pass the Core exam, then at least one specialty. Exam format and free NATE practice tests.
State Exams — Know Your NEC Edition

State Exams — Know Your NEC Edition

There is no national electrician license. How state licensing works, which NEC edition states use, and state-focused pr…