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.

Knots & Rope Capacities
Useful Information
Danger Men, Half Million Volt Workers video

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 Break Strength
MBS and SWL of Nylon Rope

Sling Load Calculation; Sling Angles, Sling Tension and Gin Loading definition and formulas; Block Load Angle Factor

Cedar, fir and pine

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

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

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

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

AC Live-line MAD
Altitude correction factor

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.

What’s New

Version 2.0.1

This app has been updated by Apple to display the Apple Watch app icon.

- iPad support
- bug fixes

Ratings and Reviews

2.9 out of 5
20 Ratings

20 Ratings

LM 92255 ,

Lineman app

Well I like what's there if you can read it. You have to make the screens to be able to zoom in to see better. Remember we are working outside and is is very hard to see some of the tables. I would give it a higher rating for zoom to work. Great idea though.

Camcade77 ,

Not bad

Not a bad app! I read reviews on being able to read it and not being able to zoom. I turned my phone sideways and it makes it bigger. You can also screenshot the image and then zoom that may be a little aggravating but it works.

Freeb1rd3 ,

Useful, hopefully still relevant

First off, you can zoom!! Tap on the image and it pops up in another page and is zoomable. Linework is changing so much some of the minimum approach things and such might be outdated. But I'm sure they are still practical, good app though from the looks of it

App Privacy

The developer, Stephanie Buchanan, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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