The Blog
Code changes explained without the committee language, calculations worked end to end with real numbers, and the field tips that only come from doing the work.
Written by a licensed electrician who still pulls wire. Everything here is paraphrased for education and is not a substitute for the official NFPA 70 publication or your AHJ.
Wire and Bolt Torque: What NEC 110.14(D) Actually Requires
The NEC torque requirement in plain English: when a calibrated tool is required, where to find the value, and why inspectors are now writing this up.
Read it →Wire Size Chart: Conductor Ampacity Under NEC 310.16
Copper and aluminum ampacity by conductor size and temperature column, plus the termination rule, correction factors and adjustment that change the answer.
Read it →Voltage Drop Chart: Maximum Run Length by Wire Size
Quick-reference voltage drop tables showing maximum run length by conductor size and load at 120 and 240 volts, with the assumptions behind every number.
Read it →Transformer Sizing: kVA, Primary and Secondary Current
How to size a transformer and its overcurrent protection: the kVA formulas for single and three-phase, plus primary and secondary protection under Article 450.
Read it →Three-Phase Power Calculations You Actually Use in the Field
Three-phase power, current and kVA formulas explained without the theory: where the 1.732 comes from, wye versus delta voltage, and worked field examples.
Read it →Rough-In Inspection Checklist: 22 Things to Check Before You Call
A 22-point electrical rough-in checklist covering box fill, support, cable protection, grounding, GFCI and AFCI layout, and labeling. Free printable PDF.
Read it →Residential Load Calculation: Article 220, Step by Step
How to run a dwelling unit load calculation under NEC Article 220 using the standard method, with a worked example and the demand factors that apply.
Read it →How to Look Up an NEC Section Fast (Without Knowing the Number)
A practical method for finding a code requirement quickly: how the NEC is organized, when to use the index versus the table of contents, and common traps.
Read it →NEC Adoption by State: Which Code Edition Your Jurisdiction Enforces
Which NEC edition each state enforces in 2026, why adoption lags publication, and how to confirm the code your AHJ will actually inspect you against.
Read it →Master Electrician Exam Prep: 25 Practice Questions With Answers
Twenty-five master electrician exam practice questions with worked answers and NEC references, weighted toward calculations, services, and code administration.
Read it →Grounding Electrode Conductor Sizing Under NEC 250.66
How to size a grounding electrode conductor from the service entrance conductors, plus the electrode-specific caps that override the table.
Read it →GFCI vs AFCI: What Each Does and Where Each Is Required
The difference between ground-fault and arc-fault protection, where each is required, how the requirements expanded by NEC edition, and when you need both.
Read it →EV Charger Circuit Sizing: What Article 625 Requires
How to size an EV charger circuit: the continuous load rule, service capacity, load management systems, GFCI and disconnect requirements under Article 625.
Read it →Electrician Continuing Education Requirements by State
How electrician CE requirements work: typical hour counts, code-update hour rules, renewal cycles, and how to verify your own state's requirements correctly.
Read it →Conduit Fill: How Many Conductors Fit in EMT, PVC and Rigid
Conduit fill percentages, how to use NEC Chapter 9 Tables 1, 4 and 5, and why the answer changes with insulation type as much as with conductor size.
Read it →Breaker and Overcurrent Device Sizing: Circuits, Feeders and Motors
How to size overcurrent protection for branch circuits, feeders and motors, including the continuous load rule and why motor circuits break the usual pattern.
Read it →Box Fill: How to Size a Box Correctly Under NEC 314.16
How to calculate box fill under NEC 314.16: what counts, what does not, the volume allowances per conductor size, and two fully worked examples.
Read it →Best Electrician Apps in 2026: What Each One Is Actually Good At
An honest comparison of electrician apps for code lookup, calculators and exam prep, including where our own app is the wrong tool for the job.
Read it →2026 NEC Code Changes: Everything Electricians Need to Know
Every 2026 National Electrical Code change ranked by real-world impact: reorganization, GFCI for HVAC, arc flash labeling, load calcs and EV rules.
Read it →How the NEC Has Changed from 2008 to 2023
Fifteen years of National Electrical Code changes across six cycles: GFCI, AFCI, tamper-resistant receptacles, surge protection and energy storage.
Read it →How to Calculate Voltage Drop — Step by Step
Calculate voltage drop for any circuit with worked single-phase and three-phase examples, the formulas, K values and what the NEC actually recommends.
Read it →NEC 2023 vs 2020: Key Changes Every Electrician Needs to Know
What changed between the 2020 and 2023 NEC: expanded GFCI, emergency disconnects, surge protection and energy storage, broken down article by article.
Read it →Journeyman Exam Prep: 20 Practice Questions With Answers
Twenty journeyman electrician exam practice questions with answers and NEC references, covering grounding, overcurrent, conductor sizing, box fill and motors.
Read it →Conduit Bending Cheat Sheet: Offsets, Saddles & Kicks
Conduit bending multipliers, shrink values and formulas for offsets, saddles, kicks and 90-degree stubs, for EMT and rigid. Quick field reference.
Read it →The 10 Most Common Electrical Code Violations
The violations inspectors flag most on residential and commercial jobs: missing GFCI, overfilled boxes, bad bonding and more, with the fix for each.
Read it →Arc Flash Safety: What Every Electrician Should Know
NFPA 70E arc flash essentials: PPE categories, approach boundaries, incident energy analysis, energized work permits and the 40 cal/cm2 hard stop.
Read it →GET THE FIELD PACK
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