# 2017 Master Electrician Ref. — A handbook for electricians

> Electronic pocket reference guide for electricians and electrical professionals. (iPhone/iPad app by PawEng, LLC.)

- Source: https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959 (this page in markdown: same URL + `.md`)
- Developer: [PawEng, LLC](https://appshunter.io/developer/390058606)
- Category: Productivity, Utilities
- Price: $9.99
- Rating: 4.70/5 from 1,255 App Store ratings · 24 written reviews indexed
- Age rating: 12+
- Requires: iOS 12.0 · 46 MB
- Languages: American English
- Released: 2017-09-11
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959/reviews.md

## What is 2017 Master Electrician Ref.?

Master Electrician Reference (or MER for short) 2017 is your electronic pocket electrician reference guide.

MER is for electrical designers, engineers, installers, contractors, facility managers, inspectors, exam candidates, apprentices, electricians, journeymen, architects, and technicians. MER is for people doing residential, industrial, and commercial work. Simply, if you are a Master Sparky or work with electricity in any way, this reference guide is for you!

Have you ever lost pages or had damaged pages in your pocket electricians reference? The solution is here: Use MER to keep the most important information easily accessible on your iPhone, iPod Touch, or iPad. MER will even do calculations for you; something your old pocket reference book can't do.

MER is divided into the following sections:

* Simple Circuits
  - Ohm's law, series and parallel circuits, capacitance, inductance, impedance, and reactance.

* Distributed Systems
  - Distribution wiring diagrams for 120, 208, 277, and 480 volts, color codes, breaker sizes, light switches and bells diagrams.

* Electrical Formulas
  - Formulas for kVA, kW, and HP.

* Color Codes
  - Color codes for capacitors and resistors.

* Motors and Wiring
  - Standard motor and motor starter sizes, tables of full-load currents, locked-rotor information, overload units, OCPD, nameplate information, synchronous motor speeds, three-phase STAR and DELTA diagrams, three-wire start-stop diagram, motor frame dimensions, and motor enclosure types.

* Transformers
  - KVA ratings for single- and three-phase current, transformer formulas.

* Conductor Properties
  - Conductor tables, AWG and metric wire sizes, twist-on pressure connectors, and wire combinations.

* Ampacities
  - Ampacities in raceway, cable, earth, and free air, and derating tables.

* Conduit Fill table

* Grounding Sizes
  - Equipment grounding conductor (EGC) and grounding electrode conductor (GEC).

* Metal Boxes
  - Images and sizes of metal boxes, junction / device boxes, junction / pull boxes.

* Voltage Drop calculations

* Dictionary of electrician terms

* Insulation Charts
  - Table of cable and wire types

* Electrical Symbols

* NEMA
  - Plugs and wiring diagrams, enclosure types, standard underground boxes, standard fuse and breaker sizes, standard pull box / junction sizes, standard gutter and wire-ways, standard switchboards, standard busway, standard busbar ampacity, standard panelboard sizes, and standard disconnect sizes.

* Math and Conversions
  - Formulas for algebra, geometry, fractions, temperature conversion, trig tables, unit conversions, metric prefixes, and conversions between inches and millimeters.

* Conduit Bending
  - Includes the guide "The Master Bender Way" on how to bend conduit. See the Master Bender app or MasterBender.com website for more information.

* Conduit Weights

* Copper Wire Cost

* Hole Saw Sizes

* Material Raceway Support

* Lighting
  - Fluorescent, high-intensity discharge, incandescent, LED, and low-pressure sodium.

* Standard Tool List

* Torque
  - Lugs, bolts, and screws, tightening torque.

* Dry, Damp, and Wet Locations

* Hazardous Locations

* Wiring Methods

* Safety
  - Lock-out / tag-out (LOTO), and a safety manual and first aid.


Most pages contain a general scientific calculator. It is expression based: Just enter an expression and evaluate it. It understands trig and power functions, can convert between radians and degrees, and has built-in basic constants like pi and e.

MER includes key NEC tables from the National Electrical Code (NEC) 2017.

We also have MER apps available for NEC 2011 and NEC 2014 code years.

Visit our website at MasterSparky.com for more information.

## Key features

- Electrical formulas and calculations
- Wiring diagrams for various systems
- Motor and transformer specifications
- Conductor and ampacity tables
- Dictionary of electrician terms
- NEMA standards and diagrams
- Math and conversion tools

## Chart rankings

- #119 in Top Paid · Productivity (US App Store)

## What do users think of 2017 Master Electrician Ref.?

Overall sentiment: neutral

**Pros**

- 👍 Quick reference
- 🚀 Best app for electrical information
- 🚀 Concise and well-laid out information
- 🚀 Comprehensive electrical references

**Cons**

- 🐛 App needs to be updated
- 🐛 Inaccurate information in some areas
- 🐛 Limited functionality compared to expectations
- 🐛 Overlapping table of contents

**Commonly reported bugs**

- Conduit fill information missing for certain types
- Login screen freezes
- Compatibility issues with older devices

**Most requested features**

- Update to latest NEC code
- Add calculation tools for conduit fill and voltage drop
- Improve user interface and navigation

## Recent user reviews (10 of 24)

All indexed reviews: https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959/reviews.md

### 5/5 — Updates

*2026-03-31*

When are you going to update to the 2020 or 2023 codes?

### 5/5 — Excellent Electrical Reference App

*2026-02-15, version 2.0.8*

This app is extremely helpful for electrical code references and field calculations. It’s organized, easy to use, and reliable when you need quick answers on site. A great tool for apprentices, journeymen, and those preparing for their Master exam. Definitely a valuable addition to your toolbox.

### 5/5 — Master Electrician

*2025-02-25*

Best app for quick reference, thumbs up.

### 2/5 — Conduit fill

*2024-01-04*

How do you change the conduit type in the conduit fill menu? It’s set for emt.

### 2/5 — What’s the point

*2023-10-31*

I guess I misunderstood what this app does. It’s just a bunch of PDFs of what my codebook or uglies will show, but there are no calculations.  Ie. Does not even calculate conduit fill.  Am I missing something?

### 1/5 — Raiden electrical

*2023-08-09*

The app needs to be updated

### 5/5 — Best Electrical Reference App!!

*2023-05-07*

This is probably the best overall app for electrical references for any on the job Electrician, Engineer, Mechanic, etc that there is out there. If you need any information as it pertains to the electrical world this is the ONLY app to have on your smartphone. It gives you concise information in an East to read and we'll laid out format that's easy to find and reference. I highly recommond it to any person working in the electrical field.

**Developer response:** Thank you Sparkyboy71. We are happy you like the app!

### 5/5 — Updates

*2022-12-18*

When are you going to update to the 2020 or 2023 codes?

### 5/5 — Great app

*2022-08-16*

This is a great app to have at your fingertips 
It up to date with all of the information you need.

### 5/5 — Electrician

*2022-07-26*

This App saves lives!

## Frequently asked questions about 2017 Master Electrician Ref.

### What does the 2017 Master Electrician Ref. app do?

This app serves as an electronic pocket reference guide for electricians and related professionals. It provides access to essential electrical formulas, diagrams, tables, and definitions, making it easier to perform calculations and find critical information on the go.

### What kind of information is included in the app?

The app covers a wide range of topics including simple circuits, distributed systems, electrical formulas, color codes, motors and wiring, transformers, conductor properties, ampacities, grounding sizes, metal boxes, voltage drop calculations, insulation charts, electrical symbols, NEMA standards, math and conversions, conduit bending, and lighting.

### Is this app free to use?

Based on the provided information, this application is a paid product. There are no mentions of free usage, subscriptions, or in-app purchases, indicating a one-time purchase model.

### What devices is the 2017 Master Electrician Ref. app compatible with?

The app is designed to be used on Apple mobile devices, specifically mentioning iPhone, iPod Touch, and iPad. This suggests it is an iOS application.

### Who would benefit most from using this app?

This app is ideal for a broad range of electrical professionals, including electricians, journeymen, apprentices, master sparkies, electrical designers, engineers, installers, contractors, facility managers, inspectors, and architects who need quick access to electrical reference material and calculation tools.

## Version history (last 5 releases)

### 2.0.8 — 2024-01-14

Updated the NEC adoption map. Changed the minimum supported iOS version from 11 to 12.

### 2.0.7 — 2022-05-01

Bug fixes

### 2.0.6 — 2021-07-18

On smaller screens (on most iPhones or in split-screen mode on iPads), the app will now start up showing the menu.

### 2.0.5 — 2021-07-17

We've fixed a few bugs and updated the NEC adoption map.

### 2.0.4 — 2020-04-18

Bug fixes

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## More apps by PawEng, LLC

- [Master Electrician Ref. Lite](https://appshunter.io/ios/app/master-electrician-ref-lite/id889449126)
- [Electrical Code-A-Day](https://appshunter.io/ios/app/electrical-code-a-day/id934222651)
- [Master Bender Gold](https://appshunter.io/ios/app/master-bender-gold/id1019334792)
- [Study Cards App](https://appshunter.io/ios/app/study-cards-app/id1583483972)
- [Math Reference Book](https://appshunter.io/ios/app/math-reference-book/id6760047777)

All apps by PawEng, LLC: https://appshunter.io/developer/390058606

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*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 2026-08-26.*