# TexasElectricianExam

> Free, independent practice for the Texas TDLR electrician exams (Journeyman, Master, Residential Wireman), on the 2026 NEC, which Texas exams have used since September 1, 2026. Unlimited calculation problems with worked steps that cite the 2026 NEC section to open, open-book code lookup practice, practice exams timed like PSI, and sourced guides, in English and Spanish (Spanish pages under /es/). Problems are original and generated, not real exam questions. NEC tables are never reproduced. Texas facts checked 2026-11-09.

Key facts: pass mark 70% on each part; Journeyman = NEC knowledge 59 questions/130 min + calculations 26/110 min; Master = 75/150 + 33/170; Residential Wireman = one 85-question exam; fee $78 (Journeyman, Master) or $64; open book with your own soft-bound 2026 NEC; exam offered in Spanish at no extra cost (PSI candidate bulletin updated 9/15/2026). In fiscal 2025, 20.56% passed Journeyman calculations and 19.08% passed Master calculations (TDLR).

## Start here
- [Home](https://texaselectricianexam.com/)
- [Calculations](https://texaselectricianexam.com/calculations/): 26 calculation topics with worked steps and unlimited practice.
- [Practice exams](https://texaselectricianexam.com/practice-test/): Journeyman, Master and Residential Wireman, timed like PSI.
- [Journeyman Electrician practice exam](https://texaselectricianexam.com/practice-test/journeyman/): Two parts since March 2025: 59 NEC knowledge questions in 130 minutes and 26 calculation questions in 110 minutes. Pass each part with 70%.
- [Master Electrician practice exam](https://texaselectricianexam.com/practice-test/master/): Two parts: 75 NEC knowledge questions in 150 minutes and 33 calculation questions in 170 minutes, heavy on services, feeders and motors.
- [Residential Wireman practice exam](https://texaselectricianexam.com/practice-test/residential-wireman/): One exam of 85 questions in 4 hours 20 minutes, with dwelling load calculations mixed in among the code questions.
- [Code lookup practice](https://texaselectricianexam.com/code-lookup/): 170 open-book NEC lookup and code questions.
- [Formula sheet](https://texaselectricianexam.com/formula-sheet/): Every formula with the 2026 NEC section to open.
- [2026 NEC changes](https://texaselectricianexam.com/nec-2026-changes/): Article 220 became Article 120; 2 VA/ft² dwelling load; 8 kVA optional tier; new dryer factors.
- [Pass rates](https://texaselectricianexam.com/pass-rates/): TDLR exam statistics, fiscal 2022 to 2025.
- [Glossary](https://texaselectricianexam.com/glossary/): English-Spanish electrical glossary.
- [Guides](https://texaselectricianexam.com/guides/): Exam format, open-book rules, licenses, fees, CE and reciprocity.
- [About and sources](https://texaselectricianexam.com/about/)

## Full text
- [Everything in English](https://texaselectricianexam.com/llms-full.txt): All calculation topics and guides as Markdown.
- [Todo en español](https://texaselectricianexam.com/llms-full-es.txt): Todos los cálculos y guías en Markdown.

## Calculations: Dwelling load calculations
- [Dwelling optional load calculation](https://texaselectricianexam.com/calculations/dwelling-optional-load/): The optional method adds every general load at nameplate (2 VA/ft² lighting, 1,500 VA per small-appliance and laundry circuit, range, dryer, water heater and other appliances), takes the first 8 kVA at 100% and the rest at 40%, then adds the heat or AC load from 120.82(C) and any EV charger at 100%.
- [Dwelling standard load calculation](https://texaselectricianexam.com/calculations/dwelling-standard-load/): The standard method adds the dwelling loads one group at a time, each with its own demand factor: general lighting at 2 VA/ft² plus 1,500 VA per small-appliance and laundry circuit through Table 120.45, 75% of four or more fastened appliances, the dryer, the range from Table 120.55 and the larger of heat or AC. Divide the total by 240 V for the service amperes.
- [Fastened appliance demand load](https://texaselectricianexam.com/calculations/appliance-demand/): In a dwelling standard calculation, add the nameplate ratings of the fastened-in-place appliances such as the water heater, dishwasher, disposal, trash compactor and built-in microwave. If there are four or more, take 75% of the total (120.53). Ranges, dryers, space heat, air conditioning and EV chargers are not part of this group.

## Calculations: Commercial load calculations
- [Commercial lighting load](https://texaselectricianexam.com/calculations/commercial-lighting-load/): Multiply the floor area by the Table 120.42(A) unit load for the occupancy, such as 1.3 VA/ft² for an office or 1.9 VA/ft² for retail. Add 200 VA per foot of show window and 1,200 VA per sign outlet. In the 2026 NEC the 125% continuous factor is applied when sizing the feeder conductors and OCPD, not inside the load calculation.
- [Receptacle load](https://texaselectricianexam.com/calculations/receptacle-load/): In non-dwelling buildings, count 180 VA for each receptacle yoke (120.14(I)) and add any multioutlet assembly load (120.14(H)). If the total is over 10,000 VA, take the first 10,000 VA at 100% and the rest at 50% (Table 120.47).

## Calculations: Conductors and overcurrent
- [Ampacity correction and adjustment](https://texaselectricianexam.com/calculations/ampacity-correction/): To derate a conductor, take its Table 310.16 ampacity (the 90 °C column for 90 °C wire), multiply by the ambient temperature correction factor from Table 310.15(B)(1)(1) and by the Table 310.15(C)(1) adjustment factor for more than three current-carrying conductors. The result may not exceed the ampacity in the termination column.
- [Conductor sizing](https://texaselectricianexam.com/calculations/conductor-sizing/): To size a conductor, find the smallest size in Table 310.16 whose ampacity covers the load, reading the column your terminations allow under 110.14(C): 60 °C for circuits of 100 A or less unless the equipment is marked 75 °C, and 75 °C above 100 A. Then check 240.4(D) for 14, 12 and 10 AWG.
- [Continuous loads](https://texaselectricianexam.com/calculations/continuous-loads/): A continuous load runs at its maximum current for 3 hours or more. Branch-circuit and feeder conductors and overcurrent devices must be rated at least 125% of the continuous load plus 100% of the noncontinuous load (210.19, 210.20, 215.2, 215.3). Round the device up to the next standard size.
- [Overcurrent device sizing](https://texaselectricianexam.com/calculations/ocpd-sizing/): An overcurrent device must protect the conductor at its ampacity. If the ampacity is not a standard rating and the device is 800 A or less, 240.4(B) lets you use the next standard size up from 240.6(A). Over 800 A you must round down (240.4(C)), and 14, 12 and 10 AWG conductors are capped by 240.4(D).
- [Voltage drop](https://texaselectricianexam.com/calculations/voltage-drop/): Voltage drop is the voltage lost in the conductors. For single-phase, VD = 2 × K × I × L ÷ CM; for three-phase, use 1.732 instead of 2. K is 12.9 for copper and 21.2 for aluminum, L is the one-way length in feet and CM comes from Chapter 9, Table 8. Percent drop is VD ÷ source voltage × 100.

## Calculations: Motors
- [Motor branch-circuit conductors](https://texaselectricianexam.com/calculations/motor-branch-circuit/): Branch-circuit conductors for one continuous-duty motor must have an ampacity of at least 125% of the motor's table full-load current (NEC 430.22). Look up the full-load current in Table 430.248 or 430.250, multiply by 1.25, then pick the conductor from Table 310.16 in the column that matches the terminal temperature rating.
- [Motor feeders](https://texaselectricianexam.com/calculations/motor-feeder/): A feeder for several motors needs conductors rated at least 125% of the largest motor's table full-load current plus the full-load currents of the other motors (NEC 430.24). The feeder breaker or fuse may be no larger than the largest motor branch-circuit device plus the other motors' full-load currents (430.62(A)), so you round down.
- [Motor full-load current](https://texaselectricianexam.com/calculations/motor-full-load-current/): Motor full-load current (FLC) for sizing conductors and short-circuit protection comes from NEC Table 430.248 (single-phase) or 430.250 (three-phase), found by horsepower and voltage, not from the nameplate. The nameplate current is used only for sizing the overload protection.
- [Motor overload protection](https://texaselectricianexam.com/calculations/motor-overloads/): A separate motor overload relay is sized from the nameplate full-load current, not the NEC table. Under 430.32(A)(1) it may trip at no more than 125% of nameplate current for motors with a service factor of 1.15 or more or a marked temperature rise of 40 °C or less, and 115% for all other motors.
- [Motor short-circuit protection](https://texaselectricianexam.com/calculations/motor-ocpd/): A motor's branch-circuit breaker or fuse is sized by multiplying the table full-load current by the percentage in Table 430.52(C)(1) for the device type, such as 250% for an inverse time breaker or 175% for a dual-element fuse. If the result is not a standard size, Exception No. 1 lets you use the next standard size up.

## Calculations: Boxes and raceways
- [Box fill](https://texaselectricianexam.com/calculations/box-fill/): Box fill is the minimum volume a box needs for the conductors, devices, clamps and fittings inside it. Count each item the way NEC 314.16(B) says, multiply each count by the volume allowance for its conductor size, and add the results.
- [Conduit fill](https://texaselectricianexam.com/calculations/conduit-fill/): Conduit fill limits how much of a raceway's cross section the conductors may take up: 40% for more than two conductors. Add up the area of every conductor from Chapter 9 Table 5, then pick the smallest trade size in Table 4 whose 40% area is at least that total.
- [Pull box sizing](https://texaselectricianexam.com/calculations/pull-box-sizing/): Pull box sizing under NEC 314.28 applies to conductors 4 AWG and larger. A straight pull needs a box 8 times the trade size of the largest raceway; an angle or U pull needs 6 times the largest raceway in a row plus the trade sizes of the other raceways in that row.

## Calculations: Grounding and bonding
- [Equipment grounding conductor sizing](https://texaselectricianexam.com/calculations/egc-sizing/): The equipment grounding conductor is sized from the rating of the overcurrent device protecting the circuit, using Table 250.122, not from the load or the circuit conductors. If the ungrounded conductors are made larger, for example for voltage drop, the EGC must grow by the same circular mil ratio (250.122).
- [Grounding electrode conductor sizing](https://texaselectricianexam.com/calculations/gec-sizing/): The grounding electrode conductor (GEC) is sized from the largest ungrounded service-entrance conductor, or the combined area of one phase of parallel sets, using Table 250.66. If the GEC runs only to a ground rod it never has to be larger than 6 AWG copper; only to a concrete-encased electrode, 4 AWG copper; only to a ground ring, the size of the ring.

## Calculations: Transformers
- [Transformer current](https://texaselectricianexam.com/calculations/transformer-current/): A transformer's full-load current on either side is its kVA rating times 1,000 divided by that side's voltage, and also divided by 1.732 for a three-phase transformer. Voltage changes in the same ratio as the turns, and current changes in the opposite ratio.
- [Transformer overcurrent protection](https://texaselectricianexam.com/calculations/transformer-protection/): For a transformer rated 1000 V or less, NEC Table 450.5(B) (Table 450.3(B) in the 2023 NEC) sets the largest overcurrent device as a percentage of rated current. With primary protection only, the limit is 125% of a primary current of 9 A or more; with both primary and secondary protection, the primary may go to 250% and the secondary to 125% of a secondary current of 9 A or more.

## Calculations: Electrical theory
- [Ohm's law and power](https://texaselectricianexam.com/calculations/ohms-law/): Ohm's law says voltage equals current times resistance (E = I × R), and power equals voltage times current (P = E × I). Pick the version of the formula that solves for the value you need from the two values you know.
- [Power factor and efficiency](https://texaselectricianexam.com/calculations/power-factor-efficiency/): True power in watts equals apparent power in volt-amperes times the power factor, so kW = kVA × PF. Efficiency is output divided by input, and one horsepower of motor output equals 746 watts, so a motor's input watts are hp × 746 ÷ efficiency.
- [Series and parallel circuits](https://texaselectricianexam.com/calculations/series-parallel-circuits/): In a series circuit the resistances add and the same current flows through each one. In a parallel circuit every branch gets the full voltage, and the total resistance is the reciprocal of the sum of the reciprocals, which is always smaller than the smallest branch.
- [Three-phase power](https://texaselectricianexam.com/calculations/three-phase-power/): For a balanced three-phase load, current equals volt-amperes divided by the line-to-line voltage times 1.732 (the square root of 3). For a single-phase load, current is volt-amperes divided by voltage, even when the load is fed from two phases of a three-phase system.

## Guides
- [Texas Journeyman Electrician Exam: Format, Fees and How to Pass](https://texaselectricianexam.com/guides/texas-journeyman-electrician-exam/): The Texas journeyman exam has two PSI portions: 59 NEC items in 130 minutes and 26 calculations in 110. Fees, open-book rules, pass rates, how to study.
- [Texas Master Electrician Exam: Format, Fees and How to Pass](https://texaselectricianexam.com/guides/texas-master-electrician-exam/): The Texas master electrician exam is two PSI portions: 75 NEC items in 150 minutes and 33 calculations in 170. Fees, open-book rules, pass rates, study plan.
- [Texas Residential Wireman Exam: Format, Fees and How to Pass](https://texaselectricianexam.com/guides/texas-residential-wireman-exam/): The Texas residential wireman exam is one PSI test: 80 scored items in 240 minutes plus 5 unscored. Outline, $64 fee, open-book rules, pass rates, study tips.
- [How to Pass the Texas Electrician Calculations Exam](https://texaselectricianexam.com/guides/how-to-pass-the-calculations-exam/): About 1 in 5 pass the Texas journeyman and master calculations portions. A time budget, a 4-step method, common traps and drills for each outline area.
- [Open-Book NEC Rules and Tabs for the Texas Electrician Exam](https://texaselectricianexam.com/guides/open-book-nec-rules-and-tabs/): What PSI allows in your NEC for the Texas electrician exam: publisher tabs only, marks made beforehand, no Handbook or spiral. How to set up your book.
- [Calculator Rules for the Texas Electrician Exam](https://texaselectricianexam.com/guides/calculator-rules/): PSI allows only silent, battery-powered, non-programmable calculators with no paper tape or letter keys. What that means, what to buy, how to use it.
- [Taking the Texas Electrician Exam in Spanish](https://texaselectricianexam.com/guides/texas-electrician-exam-in-spanish/): PSI offers the Texas electrician exams in Spanish at no extra cost; you choose when you schedule. Dictionary rules, the English NEC, and a Spanish term list.
- [Retaking the Texas Electrician Exam](https://texaselectricianexam.com/guides/retaking-the-texas-electrician-exam/): Failed a Texas electrician exam? Retakes cost $78 for journeyman or master and $64 for wireman, with no stated wait. What is known and what to do next.
- [Exam Day at PSI for the Texas Electrician Exam](https://texaselectricianexam.com/guides/exam-day-at-psi/): What to bring and expect at a PSI center for the Texas electrician exam: arrive 30 minutes early with one valid ID, your NEC and calculator. Storage, scoring.
- [How to Become an Electrician in Texas](https://texaselectricianexam.com/guides/how-to-become-an-electrician-in-texas/): The Texas electrician path from apprentice to master and contractor: hours, exams and TDLR fees for each license, as of November 2026.
- [Texas Apprentice Electrician License](https://texaselectricianexam.com/guides/texas-apprentice-electrician/): How to get a Texas apprentice electrician license: no exam, $20 online application, who can supervise you, yearly renewal and CE, as of November 2026.
- [Texas Journeyman Electrician License Requirements](https://texaselectricianexam.com/guides/texas-journeyman-license-requirements/): Texas journeyman electrician requirements: 8,000 hours under a master (test at 7,000), $30 TDLR fee, $78 two-part PSI exam, yearly renewal and CE.
- [Texas Master Electrician License Requirements](https://texaselectricianexam.com/guides/texas-master-electrician-license-requirements/): Texas master electrician requirements: journeyman license held 2 years, 12,000 hours under a master, $45 TDLR fee and a $78 two-part PSI exam (Nov 2026).
- [Texas Residential Wireman License](https://texaselectricianexam.com/guides/texas-residential-wireman-license/): Texas residential wireman license: 4,000 hours or an approved CTE program, a $64 single PSI exam, $20 fee, dwellings up to four stories (as of Nov 2026).
- [Texas Electrician Continuing Education Requirements](https://texaselectricianexam.com/guides/texas-electrician-continuing-education/): Texas electrician CE: 4 hours each license term covering the NEC, Texas law, TDLR rules and NFPA 70E. Who needs it, deadlines and records, as of Nov 2026.
- [Texas Electrical Contractor License](https://texaselectricianexam.com/guides/texas-electrical-contractor-license/): Texas electrical contractor license: no exam, a master electrician of record, $300K/$600K liability insurance, workers' comp proof and a $110 fee (Nov 2026).
- [Texas Electrician Reciprocity: Which States Qualify](https://texaselectricianexam.com/guides/texas-electrician-reciprocity/): Texas electrician reciprocity as of November 2026: 8 states for master, 10 for journeyman, the hours and fees TDLR asks for, and what does not transfer.
- [Other TDLR Electrical Licenses](https://texaselectricianexam.com/guides/other-tdlr-electrical-licenses/): Texas journeyman industrial, maintenance, residential appliance installer, sign and lineman licenses: hours, exam format and TDLR fees as of November 2026.

## Optional
- Spanish versions of every page are under /es/ with the same path, for example https://texaselectricianexam.com/es/calculations/
- [Examen de electricista oficial (Journeyman) en Texas: formato, costo y cómo aprobar](https://texaselectricianexam.com/es/guides/texas-journeyman-electrician-exam/)
- [Examen de maestro electricista (Master) en Texas: formato, costo y cómo aprobar](https://texaselectricianexam.com/es/guides/texas-master-electrician-exam/)
- [Examen Residential Wireman en Texas: formato, costo y cómo aprobar](https://texaselectricianexam.com/es/guides/texas-residential-wireman-exam/)
- [Cómo aprobar el examen de cálculos de electricista en Texas](https://texaselectricianexam.com/es/guides/how-to-pass-the-calculations-exam/)
- [El NEC a libro abierto: reglas y pestañas para el examen de electricista en Texas](https://texaselectricianexam.com/es/guides/open-book-nec-rules-and-tabs/)
- [Reglas de la calculadora para el examen de electricista en Texas](https://texaselectricianexam.com/es/guides/calculator-rules/)