# Lineman's Reference - URD — Underground Lineman Trainer > Underground distribution system training for electrical linemen and apprentices. (iPhone/iPad app by Digital Apprentice LLC.) - Source: https://appshunter.io/ios/app/linemans-reference-urd/id6478995455 (this page in markdown: same URL + `.md`) - Developer: [Digital Apprentice LLC](https://appshunter.io/developer/1565687382) - Category: Education, Entertainment - Price: $9.99 - Rating: 4.50/5 from 62 App Store ratings · 17 written reviews indexed - Age rating: 9+ - Requires: iOS 12.1 · 193 MB - Languages: American English - Released: 2024-11-25 - Data updated: 2026-09-05 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/linemans-reference-urd/id6478995455/reviews.md ## What is Lineman's Reference? Lineman's Reference - URD is the latest app from Digital Apprentice that will teach linemen and apprentices the basics of underground distribution systems. Learn how to: - Isolate bad cable sections - Hipot cable sections - Isolate and change bad pad-mounted transformers - Troubleshoot underground outages - Switch Underground Distribution Loops Primary Training Labs: - Fault Indicators - Cable Isolation - Hipotting - Transformer Isolation Troubleshooting Labs (with optional quizzes): - Beginner (Single Phase) - Intermediate (Single Phase) - Advanced (Three Phase & Single Phase) Devices Labs - Break down and inspect the components of URD equipment: - Single Phase Padmount - Three Phase Padmount - Load-Break Elbows ## Key features - Learn cable isolation - Hipot cable sections - Transformer isolation and replacement - Troubleshoot underground outages - Switch underground distribution loops - Interactive training labs - Troubleshooting quizzes ## Chart rankings - #103 in Top Paid · Education (US App Store) ## Recent user reviews (10 of 17) All indexed reviews: https://appshunter.io/ios/app/linemans-reference-urd/id6478995455/reviews.md ### 1/5 — Can not use shotgun stick for anything !! *2026-08-05* Just paid $9.99 and I can not do anything on the app . I can pick up park stands , phasing sticks or dummy caps . ### 4/5 — Think it’s great *2026-07-27* I think this app is great for teaching or learning when new to underground power, I think it has a great opportunity to grow and expand on URD devices or systems like thumping wire, service savers and how to set up, cubicles, metering cubicles, or showing more advanced switching with cubicle switches and loops together, or even other URD terminations like t-body’s, potheads, or maybe even splices. I so think it’s a good idea for the secondary pedestal and meter base setup that’s already coming soon. Also adding troubleshooting on secondary may be an idea. Overall awesome app! ### 5/5 — Think it’s great *2026-02-09* I think this app is great for teaching or learning when new to underground power, I think it has a great opportunity to grow and expand on URD devices or systems like thumping wire, service savers and how to set up, cubicles, metering cubicles, or showing more advanced switching with cubicle switches and loops together, or even other URD terminations like t-body’s, potheads, or maybe even splices. I so think it’s a good idea for the secondary pedestal and meter base setup that’s already coming soon. Also adding troubleshooting on secondary may be an idea. Overall awesome app! ### 5/5 — Probably one of the most beneficial apps on my phone *2026-01-11* I enjoy this app so much, it’s amazing to mess around with this and really challenge yourself. One thing I cannot wait for is the secondary to become available! I’d also like to ask when that’s looking to release?? I’ve been extremely excited to play it. ### 4/5 — Really good…Really enjoyable *2025-12-04* It’s a decent training tool and great way to spend some time. I’m a PLT and would like to see if there’s a way the dev’s could make some modifications to add another qualified worker as well as have it simulated with an individual. The additional worker would be good cause some utilities mandate that Underground is done in pairs ### 5/5 — New Lineman *2025-10-08* My foreman recommended this app to learn the trade a little better. It’s helped my understanding of the field a lot. I wish there was an option to turn of the “Fault Indicators” because that is something that I don’t have in my actual field of work. Overall great app, would recommend! ### 5/5 — Gameplay *2025-08-22* I wish there were harder simulations. Including things like changing out three phase pads, single phase loops inside three phase loops, blown out elbows, bad bushings, and cubicles. I have found that I’ve done every quiz simulation there is. Cut cables in complicated loops that cross over each other would be a great example of a hard problem. Also if you could put the materials on the side of the transformers. It can be very hard to reach those at the bottom of the screen when using a phone with a case. Other than that this app is perfect for learning. I look forward to the update for secondaries and meter bases. I hope you include parallel services in meter bases! **Developer response:** Thanks for the review! Most of what you mentioned is on the to-do list! Stay tuned! ### 5/5 — Great app!! Honest mistake on my end! *2025-06-20* Bought the app, went straight into cable isolation where “the shotgun stick wasn’t working”. Not knowing that if I were to have just went through the tutorial I would have saved a lot of time! I emailed the owner and he helped me out in seconds!!! 1 - PICK UP SHOTGUN STICK WITH ONE FINGER 2 - DRAG THE SHOTGUN STICK TO WHAT EVER YOU HAVE TO PICK UP AND KEEP YOUR FINGER ON THE SCREEN 3 - USE ANOTHER FINGER TO PICK UP THE ITEM **Developer response:** I really appreciate the review man! Thank you! ### 1/5 — Don’t waste your money!!! *2025-06-15* Anybody get ahold of these guys? Did they get the problem fixed? ### 5/5 — Shotgun/Feed Thru Issue *2025-04-03* Even with the bug in this game, the info/tutorial is a must for apprentices/lineman. Just as the X-Former lab, these apps are very well put for their lessons. **Developer response:** Thanks for the review! ## Frequently asked questions about Lineman's Reference ### What does the Lineman's Reference - URD app teach? This app teaches linemen and apprentices the fundamentals of underground distribution systems. It covers essential skills such as isolating bad cable sections, hipotting cables, replacing pad-mounted transformers, troubleshooting outages, and switching distribution loops. ### What are the key training features of this app? The app includes primary training labs focused on fault indicators, cable isolation, hipotting, and transformer isolation. It also offers troubleshooting labs for beginner, intermediate, and advanced levels, with optional quizzes to test knowledge. Device labs allow for inspection of URD equipment components. ### Is this app free to use? Yes, the application is available for free. There are no in-app purchases or advertisements mentioned, indicating a completely free user experience. ### Who is the target audience for this app? The app is specifically designed for individuals working as or training to become electrical linemen and apprentices. It aims to provide them with the necessary knowledge and skills for underground distribution systems. ### What kind of troubleshooting scenarios are covered? The app offers troubleshooting labs that cover single-phase and three-phase scenarios. These labs are categorized by difficulty, ranging from beginner to advanced, allowing users to progressively build their problem-solving abilities in underground distribution. ## Version history (last 3 releases) ### 1.0.03 — 2025-03-15 Fixed a couple bugs. Fixed issue where shotgun would not go down far enough on some devices. ### 1.0.1 — 2024-12-04 Fixed a minor bug on the Advanced Lab. ### 1.0.0 — 2024-11-25 No release notes. ## More apps by Digital Apprentice LLC - [Lineman's Reference - XFMR LAB](https://appshunter.io/ios/app/linemans-reference-xfmr-lab/id1583878194) All apps by Digital Apprentice LLC: https://appshunter.io/developer/1565687382 ## Related topics [transformer lab](https://appshunter.io/ios/topics/transformer-lab) · [lineman power](https://appshunter.io/ios/topics/lineman-power) · [lineman's reference](https://appshunter.io/ios/topics/lineman-s-reference) · [cabling trainer](https://appshunter.io/ios/topics/cabling-trainer) · [transformer lineman](https://appshunter.io/ios/topics/transformer-lineman) · [lineman-app](https://appshunter.io/ios/topics/lineman-app) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-05.*