About and sources
Who makes this site, how the problems are made and where every fact comes from.
This site is made by LAP478, a knowledge and entertainment company. We build things people learn from and things people enjoy, from apps for phones and computers to preparation for licensing and certification exams.
This site is our practice simulator for the electrician licensing exam. It exists to do one thing: let you practice the calculations of the exam the way the exam asks them, against the clock and with your own code book open.
How the practice problems are made
- Every problem is original. None is taken from any exam, and nobody outside the exam provider has the real questions.
- Answers are computed, not typed. A program writes each problem, solves it from the numbers in the problem and builds the worked solution from the same steps, so the answer key and the explanation cannot disagree.
- Each problem cites the section of the 2026 NEC it is solved with. We name sections and use values; we never reproduce the text or the tables of the Code.
- The wrong options are the results of the mistakes candidates actually make, so a wrong answer tells you which step went wrong.
- The numbers change from one attempt to the next, so repeating a set teaches the method and not the answer.
How facts are checked
Every statement about exam format, fees, rules and licensing requirements on this site comes from an official source, and the site is rebuilt only if each quoted sentence is still found, word for word, in that source. These are the sources:
- TDLR — Electricians: Exam Information
- TDLR — Electricians: Frequently Asked Questions
- TDLR — Electrician Exam Statistics, Fiscal Year 2025
- TDLR — Electrician Exam Statistics, Fiscal Year 2024
- TDLR — Apply for a Journeyman Electrician License
- TDLR — Apply for a Master Electrician License
- TDLR — Apply for an Apprentice Electrician License
- TDLR — Apply for a Residential Wireman License
- TDLR — Electricians: Out-of-State Applicants
- TDLR — Electricians: Continuing Education
- PSI — Candidate Information Bulletin, TDLR Electricians
- PSI — Candidate Information Bulletin 2388, TDLR Electricians
Corrections
If you find an error in a problem or on a page, write to supportlap478@gmail.com. We fix it and list it on the corrections page.
What this site is not
Independent study aid from LAP478. Not affiliated with or endorsed by NFPA, PSI, TDLR or any licensing board. NEC® and National Electrical Code® are registered trademarks of the National Fire Protection Association. All practice problems are original. Always confirm answers against the code edition your jurisdiction has adopted. No result on this site promises a result on a licensing exam.