--- title: "Lineman's Reference - XFMR LAB - Reviews, Revenue and Downloads in United States | Apple App Store" description: "Learn it. Wire it. Energize it. Built by a working journeyman lineman for linemen and their apprentices. The XFMR Lab simulates distribution transformer banks driven by your own wiring — the metering" --- # Lineman's Reference - XFMR LAB — United States > Transformer Training Simulator ![Lineman's Reference App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/98/96/23/98962364-6946-8c70-5fad-0fd3f3d8fa84/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png) **Developer:** [Digital Apprentice](https://apptail.io/developer/digital-apprentice-MQGc) **Category:** Education **Rating:** 4.2/5 (130 ratings) **Price:** Free **Bundle ID:** digitalapprentice.xfmr **Store:** Apple App Store **Country:** United States **Version:** 2.0.3 (released 2026-07-04) **Original Release:** 2021-09-12 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1583878194) **AppTail Page:** [https://apptail.io/app/linemans-reference-xfmr-lab-ulec/united-states](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/united-states) ## Lineman's Reference Description Learn it. Wire it. Energize it. Built by a working journeyman lineman for linemen and their apprentices. The XFMR Lab simulates distribution transformer banks driven by your own wiring — the metering, fusing, and faulting all behave the way you'd expect in the field. NEW IN 2.0 — BUILT-IN TRANSFORMER TRAINING (Replacing XFMR INFO) Six guided lessons take you from "what's a transformer?" to wiring a 3-pot bank: • Start Here — What is a Transformer? • Dual H Bushings — The Two Wirings & the Nameplate • The Tap Changer — One Pot, Multiple System Voltages • Three-Phase — The Three Phases and How They're Related • Bank Identification — Delta or Wye, Open or Closed • Your First Bank: Delta-Wye Closed (120/208) • More lessons on the way! Work the lessons in order, or jump straight to the labs. ALSO NEW IN 2.0 • The Sandbox (Beta) — wire anything from scratch in a COMPLETELY-customizable lab, with live, vector-based voltage and fault logic baked in. • Death Traps — scenario-based transformer traps linemen run into — and how to navigate them safely. • A brand-new look across every lab — new graphics, sharper, faster, & easier to read in the field. • Voltmeter you can now drag with two fingers; readings update as the leads move. • Parallel the secondary coils by hand in wye secondary labs • Stats that track lab completions, quiz scoring and for-fun stuff like the number of fuses you've blown. • User Customizations - the user can now alter the spec of their labs; from grounding to parallel coil cutover-direction, requiring the 4th cutout, tap changer implementation and more. • 2.0 is FREE for everyone who already owns XFMR Lab — thank you for years of feedback and encouragement. WHAT YOU GET Single Phase — Single Bushing · Dual Bushing Three Phase (closed) — Delta-Delta · Delta-Wye · Wye-Delta · Wye-Wye Three Phase (open) — Open Delta-Delta · Open Wye-Delta Misc — Paralleling · 4th Cutout · Death Traps (6 Scenarios) Advanced — Straight 480 · 240/480 · 277/480 · Corner-Grounded 240/480 · Wye-Wye 5-Wire (120/240 + 120/208) - all now able to be wired up Wye AND Delta on the topside The Sandbox (Beta) EVERY FUTURE UPDATE IS FREE - THE APP IS A ONE-TIME PURCHASE. I'm always working on new updates. TOOLS & REFERENCE • Volt, ohm and rotation meters with real behavior • Nameplate, secondary coil and tap changer animations • Reference diagrams for every standard bank Learning Mode walks apprentices through every wrong-connection check. Journeymen and experienced users can keep this turned off if they'd like. QUIZZES • Classic Quiz — Select each lab you want in your quiz - with graded scoring across each lab. • Advanced Quiz — You're provided with the job-site info and need to pick the right nameplate and coil setup, then wire it. • Bank ID - A beginner's quiz tied into the new XFMR Training lesson plan. The user is provided with different primary and secondary wirings and must correctly identify them. Used by 30,000+ linemen since 2021. Questions? Suggestions? Reach me at info@digitalapprentice.net ## Lineman's Reference Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/0b/54/0c/0b540cae-e5a5-a0a0-16a5-c5a9661d8c0c/ipad_1.png/2752x2064.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/2c/7e/88/2c7e8803-b654-e313-a53f-de581f539cc9/ipad_2.png/2752x2064.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/c3/38/12/c338124c-4ee5-2287-cca5-58bb9410313e/ipad_3.png/2752x2064.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/fb/d6/89/fbd68903-a3a1-7bb7-03d9-222d347cc991/ipad_4.png/2752x2064.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b0/c5/e6/b0c5e6bf-730e-aea7-c796-9b7371d28e49/ipad_5.png/2752x2064.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/6f/7e/08/6f7e08d9-9b94-a90f-6d67-9d65b1ff21d6/ipad_6.png/2752x2064.png) - [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/79/0e/db/790edb7f-5ab1-c456-c440-41fed830fb9e/ipad_7.png/2752x2064.png) - [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d1/4e/8c/d14e8c2f-ce2c-1f32-5398-e2a7726b7ddd/ipad_8.png/2752x2064.png) ## Lineman's Reference Rating Breakdown in United States - 5 stars: 75 (58%) - 4 stars: 26 (20%) - 3 stars: 12 (9%) - 2 stars: 7 (5%) - 1 stars: 10 (8%) ## Lineman's Reference Reviews in United States ### ***** "Great training reference!" This is a great app, let me just start with that. It would be great if you could build your own banks and check voltage and what not. The set diagrams are awesome but being able to play around with different connections would make it better. Also tap changer settings and info would also be a great addition. -- Climbinsticks, 2024-08-29 ### *---- "Basically just use it as a normal diagram" If you thought you’d be able to run a lot of different scenarios with this don’t bother. The app won’t let you do a ton of stuff and if you’re trying to use it to show an apprentice or something their mistake and recreate it digitally it almost certainly won’t accurately recreate that. Basically you build it correct or it doesn’t much do anything, not much point of this unless you really just want an interactive diagram because you can’t follow one that doesn’t have movable parts—which makes zero sense to me. -- ephixius, 2024-08-25 ### ***** "Awesome app" Awesome app helped me get my secondary connections down but it would be even better you guys added a create your own bank option just so guys can get a better grasp. Also be helpful if you could add a wye bank that stays in series. Hope to see more options in the future. -- KDM117!!, 2024-08-06 ### ****- "Good app kinda confused" How do you connect the h2 to the neutral everytime I tie them in I can get them to turn white but they come in upside down. How do I make them look like the picture ? I’m sure there is a way to do it but I’ve been messing with this app a few days and have yet to figure it out -- jayb9583726, 2024-03-06 ### ****- "Almost perfect" I’m using this app to practice my connections for my transformer class and it’s really really great well worth the 10$ but when I wire up a bank correctly it will tell me it’s wrong it only does this with the delta delta or the wye wye I will match them up perfectly with the image but still say it’s wrong I’ve even asked my teacher if they are wired correctly and he said yes. Once that gets fixed this app will be 5/5 -- Maxellis234, 2024-02-14 ### ***-- "Okay app" What I did not like is you can’t get a zero read on like phases it gives a 240 read when it is really a zero read this was wye delta bank straight 240 -- fckatomicwallet, 2023-12-31 ### ***-- "Timmy" Some of the answers in the advance quiz need to be fixed for the transformer selection question parts of the test. Selecting the correct transformer subtracts two points while selecting the improper voltage per nameplate is shown as correct. Please fix this as it could be confusing to anyone trying to learn. -- TimmyJA, 2023-10-31 ### ***-- "Fuse blows when nothings wrong" When making a delta secondary hookup, when you attach the case grounds, the fuse blows and says it’s wrong. Not sure if it’s a bug or I’m im doing something wrong -- Case grounds, 2023-07-02 ### ***** "Great for linemen" Great app. Highly recommend for any apprentices or journeymen looking to brush up on their banking skills. Would love to see paralleling 3 phase banks in the future. I’ve had the app for a while and have noticed new features come up, like single phase paralleling and troubleshooting. -- Silverx87, 2023-04-02 ### **--- "Wrong wiring in diagram" The diagram for a 277/480 Wye/Wye bank is wrong. Also the H.V. on the transformer name plate on dual bushing transformer is wrong. -- mdurden33, 2023-01-29 [View all Lineman's Reference reviews and detailed analytics on AppTail](https://apptail.io/account/signup?utm_campaign=ai-crawl&utm_content=reviews) ## Lineman's Reference Store Rankings | Chart | Country | Category | Rank | |-------|---------|----------|------| | Top Paid | United States | Education | #13 | | Top Paid | United States | Overall | #131 | ## Lineman's Reference Discovered Keywords - lineman guide - xfmr lab - line man ## Apps Similar to Lineman's Reference - [Registration & Learning System](https://apptail.io/app/registration-learning-system-fbi/united-states) - [CDL Exam Prep 2026 with AI](https://apptail.io/app/cdl-exam-prep-2026-with-ai-Sgs/united-states) - [Pre Trip Inspection](https://apptail.io/app/pre-trip-inspection-Ffu/united-states) - [J. J. Keller Learning Center](https://apptail.io/app/j-j-keller-learning-center-LtR/united-states) - [myCCO portal](https://apptail.io/app/mycco-portal-qWob/united-states) - [Lineman Guide](https://apptail.io/app/lineman-guide-vlec/united-states) - [PowerkVA](https://apptail.io/app/powerkva-sDec/united-states) - [North Carolina 811](https://apptail.io/app/north-carolina-811-BDec/united-states) - [ilearntohunt](https://apptail.io/app/ilearntohunt-xiAk/united-states) - [NEC Electrical Exam by Dakota](https://apptail.io/app/nec-electrical-exam-by-dakota-KmEl/united-states) ## Lineman's Reference Available In - [United States](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/united-states) - [Canada](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/canada) - [Austria](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/austria) - [Australia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/australia) - [Azerbaijan](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/azerbaijan) - [Belgium](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/belgium) - [Brazil](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/brazil) - [Belarus](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/belarus) - [Switzerland](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/switzerland) - [Chile](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/chile) - [China](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/china) - [Colombia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/colombia) - [Czechia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/czechia) - [Germany](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/germany) - [Denmark](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/denmark) - [Dominican Republic](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/dominican-republic) - [Algeria](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/algeria) - [Ecuador](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/ecuador) - [Estonia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/estonia) - [Egypt](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/egypt) - [Spain](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/spain) - [Finland](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/finland) - [France](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/france) - [United Kingdom](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/united-kingdom) - [Greece](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/greece) - [Hong Kong SAR China](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/hong-kong) - [Croatia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/croatia) - [Hungary](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/hungary) - [Indonesia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/indonesia) - [Ireland](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/ireland) - [Israel](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/israel) - [India](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/india) - [Italy](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/italy) - [Japan](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/japan) - [South Korea](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/south-korea) - [Kuwait](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/kuwait) - [Kazakhstan](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/kazakhstan) - [Lebanon](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/lebanon) - [Mexico](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/mexico) - [Malaysia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/malaysia) - [Nigeria](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/nigeria) - [Netherlands](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/netherlands) - [Norway](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/norway) - [New Zealand](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/new-zealand) - [Peru](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/peru) - [Philippines](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/philippines) - [Pakistan](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/pakistan) - [Poland](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/poland) - [Portugal](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/portugal) - [Romania](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/romania) - [Russia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/russia) - [Saudi Arabia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/saudi-arabia) - [Sweden](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/sweden) - [Singapore](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/singapore) - [Slovakia](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/slovakia) - [Thailand](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/thailand) - [Türkiye](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/turkey) - [Taiwan](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/taiwan) - [Ukraine](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/ukraine) - [Vietnam](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/vietnam) - [United Arab Emirates](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/united-arab-emirates) - [South Africa](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/south-africa) - [Argentina](https://apptail.io/app/linemans-reference-xfmr-lab-ulec/argentina) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://apptail.io/account/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*