Guides & How-To
Plain-language guides that teach the fundamentals and show you how to stay code-compliant on the job.
How to Read the NEC Without Getting Lost
The code book looks intimidating until someone shows you how it is organized. Here is the map.
Volts, Amps, Watts, and Ohms Made Simple
Four words you will use every day. Understand what they actually mean and the math stops being scary.
Wire Gauge (AWG) Explained
Why bigger wire has a smaller number, and how to pick the right size every time.
US Wire Color Codes
Colors are not decoration. They tell the next person what a conductor does and can save a life.
AC vs DC: What Every Electrician Should Know
The grid runs on AC, your phone runs on DC, and modern systems live where they meet.
Single-Phase vs Three-Phase Power
Homes run on single-phase, factories on three-phase. Here is what actually changes.
Electrical PPE and Lockout/Tagout
The gear and the procedure that send you home with all ten fingers. Non-negotiable.
GFCI vs AFCI: When Each Is Required
Two different protectors for two different dangers. Mixing them up fails inspections.
Most Common Code Violations and How to Avoid Them
After a few hundred inspections you see the same failures over and over. Learn them once.
Arc-Flash Basics
An arc flash is an explosion of light, heat, and pressure. Respect it or it will hurt you.
Preparing for a Rough-In Inspection
Pass the rough and the finish inspection is easy. Here is how I get mine signed off the first time.
Grounding vs Bonding: The Difference That Trips Everyone
They sound the same and get used interchangeably, but they do two different safety jobs.
Types of Conduit and When to Use Each
EMT, rigid, PVC, flex. Picking the wrong raceway means redoing the run. Pick right the first time.
Types of Cable: NM, MC, and UF
Three cables you will handle constantly. Each has a place, and each has places it must not go.
Wiring a Receptacle and Switch Correctly
The two devices you install most. Do them right, safe, and inspection-ready every time.
Main Panel vs Sub-Panel
The one detail people botch on subpanels lands more red tags than anything else. Here it is.
How to Do a Dwelling Load Calculation
Size the service right and everything downstream works. Here is the standard method, step by step.
Voltage Drop Explained
Long runs lose voltage. Ignore it and motors buzz, lights dim, and equipment dies early.
Box Fill Explained
Cram too much in a box and you overheat wires and fail inspection. Counting is easy once you learn it.
Conduit Fill Basics
How many wires fit in a pipe is a code question, not a how-hard-can-you-pull question.
Apprentice to Journeyman to Master
The trade has a ladder. Know the rungs and you can plan a whole career instead of drifting.
How to Pass the Licensing Exam
The exam rewards preparation and code-navigation speed, not raw memory. Here is how I coach it.
Codex is an independent educational reference. Not the National Electrical Code® and not affiliated with the NFPA. Always verify against the adopted code and your AHJ. · Privacy