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- Lineman Guide Vs. Lineman's Reference - XFMR LAB
Lineman Guide vs Lineman's Reference - XFMR LAB Usage & Stats
DETAILS
A must-have for all lineworkers. Detailed information, charts, pictures and how-to’s for transformers, rigging, knots, rope capacities and many more.
Created by a Journeyman lineman, this app is useful for lineman and apprentices.
Calculators: Load angle factor, gin loading and guy formulas.
HOME SCREEN
Knots & Rope Capacities
Rigging
Transformers
Useful Information
Linemantrainer.com
Danger Men, Half Million Volt Workers video
KNOTS
Blood knot, bowline on a bight, bowline, clove, double sheet bend, Farrimond friction hitch, figure 8, grapevine, lanyard, Lineman’s loop, monkey fist, Prusik, running bowline, sheet bend, snubbing knot, square knot, taut-line hitch.
KNOT TABLES
Knot Break Strength
MBS and SWL of Nylon Rope
RIGGING
Sling Load Calculation; Sling Angles, Sling Tension and Gin Loading definition and formulas; Block Load Angle Factor
UTILITY POLE WEIGHTS
Cedar, fir and pine
WIRE ROPE AND CABLE
Line Angle Change Multiplication Factor
Efficiencies of Tucked or Hand-Spliced Eyes
Rope Reduction Replacement
WLL of Wire Slings
Wire Sling Capacities in Tons
MBS and SWL of Bright wire
Sling Load Angle Factors Chart
5,000lbsNylon Web Sling Ratings
6,000lbs Nylon Web Sling Ratings
8,000lbs Nylon Web Sling Ratings
TRANSFORMERS
Paralleling Coils
Line to Neutral, Line to Line Voltage Chart
Electrical Distribution Systems Chart
Insulation Class and Temperature Rise
Single Phase Transformers FLC
Three Phase Transformers FLC
TRANSFORMER CONNECTIONS
Delta-Delta 0 Degree Displacement
Delta-Delta 180 Degree Displacement
Delta-Wye 210 Degree Displacement
Delta-Wye 30 Degree Displacement
Open-Delta, Open-Delta Lighter
Open-Wye, Open-Delta Lighter Option1
Open-Wye, Open-Delta Lighter Option2
Paralleling Transformers
Wye-Delta 210 Degree Displacement
Wye-Delta 30 Degree Displacement
Wye-Wye 0 Degree Displacement
Wye-Wye 180 Degree Displacement
USEFUL INFORMATION
Voltage Regulation Standards
Wire Size and Amp Rating
Ampacities of Insulated Conductors
Ampacity Correction for Temperatures
Three Wire Residential Allowable Ampacities
Conductor Formulas
General Formulas
Guy formulas
MINIMUM APPROACH DISTANCES
AC Live-line MAD
Altitude correction factor
ELECTRICAL FORMULAS
Ohm’s Law
AC/DC Formulas
AC Efficiency and Power Factor
Electrical Measurement
Electrical Quantities & Symbols
Voltage Drop Chart
NOTES: This app is for reference purposes only. No responsibility is accepted for incidents arising from the use of this material.
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Learn it. Wire it. Energize it. Check your work.
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
- Apple App Store
- Paid
- Education
Store Rank
- -
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September 7, 2026