NEC Electrical Guides & Code Explainers
In-depth guides covering breaker sizing, conduit fill, grounding, voltage drop, and appliance circuit installation — each with real NEC citations and worked examples.
Breaker & Circuit Sizing
How to Size a Circuit Breaker (Step-by-Step Method)
The exact 5-step method electricians use to size a circuit breaker.
Breaker Amp Chart: Standard Sizes & Common Household Circuits
Quick-reference chart of standard breaker sizes, wire gauge, and common uses.
NEC 240.4(B): The Round-Up Rule for Breaker Sizing
When you can round up to the next standard breaker size, and the conditions that must be met.
Single-Phase vs Three-Phase Power: What’s the Difference?
How single-phase and three-phase power differ, and why 1.732 shows up in the math.
Conduit & Wire
How to Calculate Conduit Fill by Hand (NEC Chapter 9 Method)
The manual NEC Chapter 9 method for calculating conduit fill, with a worked example.
NEC Conduit Fill Percentage Rules Explained (1, 2, 3+)
Why fill limits change based on conductor count: 53%, 31%, and 40%.
EMT vs PVC vs Rigid Conduit: Which Should You Use?
Compare EMT, PVC, and rigid metal conduit for cost, durability, and location.
How to Bend EMT Conduit: Offset, Saddle & Stub-Up Steps
Field guide to bending EMT: offsets, saddles, and 90° stub-ups with multipliers.
Running Ethernet Cable Through Conduit: Fill Rules & Tips
How to run Cat 6/6a cable through conduit correctly and avoid a hard pull.
How to Read an AWG Wire Gauge Chart (Explained)
Why smaller AWG numbers mean thicker wire, and how the scale works.
Grounding & Bonding
Grounding vs Bonding: What’s the Difference? (NEC 250)
The NEC Article 250 distinction between GEC, EGC, and bonding jumpers.
Grounding Electrode System Explained: Rods, Pipe & Concrete
How ground rods, water pipe, and concrete-encased electrodes work together.
GEC vs EGC: What’s the Difference? (NEC Grounding Terms)
Two similar-sounding terms that do very different jobs — and how each is sized.
Boxes
Voltage Drop
EV Charging
Level 2 EV Charger Installation: Permits & Panel Steps
Permits, panel capacity checks, and circuit steps for a Level 2 install.
Tesla Wall Connector Installation: Hardwire Steps & Inspection
Hardwire steps, breaker requirements, and what inspectors check.
How to Install a NEMA 14-50 Outlet: Wiring Steps
Step-by-step install for EV charging or RV hookups.
Appliance Circuits
How to Wire an Electric Range Circuit: Steps & Receptacles
From choosing a NEMA 14-50 receptacle to connecting the range cord.
Electric Water Heater Circuit Installation & Disconnect Rules
Wiring steps and the disconnect switch NEC requires near the unit.
3-Prong vs 4-Prong Dryer Circuits: What’s the Difference?
Why the NEC moved to 4-wire circuits, and whether you can adapt a cord.
Wall Oven vs Range: How Their Electrical Circuits Differ
Compare breaker sizes, wire gauges, and why they’re wired separately.
How to Wire a Garbage Disposal: Switch & Circuit Steps
Dedicated circuit, air-switch or wall-switch hookup, and more.
Why Dishwashers Now Need GFCI Protection (2020 NEC Change)
What changed under NEC 210.8(D), and what it means for older kitchens.
How NEC Article 430 Motor Sizing Works for Well Pumps
Full-load amps, the 125% continuous factor, and standard breaker rounding.
What Is MCA and MOCP? How to Read a Mini Split Nameplate
How NEC 440.22 uses these two nameplate values for sizing.
Hot Tub Electrical Requirements: GFCI & Disconnect Rules
NEC Article 680 wiring rules for hardwired spas.
RV Electrical Hookup Guide: Shore Power & Surge Protection
30A vs 50A service, receptacle types, and campground surge protection.