Lineman's Reference
Developed by Digital Apprentice LLC | Last updated: April 26, 2025

Lineman's Reference - URD is an education app, developed by Digital Apprentice LLC, available on iOS and Android since its release in November 2024. The updated version 1.0.1 is now available to download, compatible with iOS 12.1+ and Android 10+. Before downloading this app, let's quickly review what Lineman#039;s Reference URD has to offer.
About 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
What's new in version 1.0.1
Fixed a minor bug on the Advanced Lab.
Download the Lineman's Reference App
Lineman's Reference has an IPA/APK download size of 193 MB on its latest version. Lineman's Reference costs $9.99 to download. Ready to install? Ensure you have at least 232 MB of storage space available, then tap the button or scan the QR code below to start the download process!
Ranking History in App Store (U.S)
Changelog
Compatibility
- iPhone 15, 15 Plus, 15 Pro, 15 Pro Max
- iPhone 14, 14 Plus, 14 Pro, 14 Pro Max
- iPhone 13 Pro Max
- iPhone 12 Pro
- Old devices: iPhone X/SE/8/7/6
- iPad Pro
- iPad Mini
Lineman's Reference has 0 reviews across all iTunes Stores.