# Master Electrician Ref. Lite — 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/master-electrician-ref-lite/id889449126 (this page in markdown: same URL + `.md`)
- Developer: [PawEng, LLC](https://appshunter.io/developer/390058606)
- Category: Productivity, Utilities
- Price: Free
- Rating: 4.70/5 from 2,509 App Store ratings · 6 written reviews indexed
- Age rating: 12+
- Requires: iOS 11.4 · 46 MB
- Languages: American English
- Released: 2014-06-22
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/master-electrician-ref-lite/id889449126/reviews.md

## What is Master Electrician Ref. Lite?

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

MER Lite 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 Lite to keep the most important information easily accessible on your iPhone, iPod Touch, or iPad. MER Lite will even do calculations for you; something your old pocket reference book can't do. 

MER Lite is divided into the following sections: 

* 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. 

* 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). 

* Voltage Drop calculations 

* 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. 

* Standard Tool List 

* Safety 
- 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) 2011. 

Visit our website at MasterSparky.com for more information.

If you like MER Lite, you will love the full MER. It contains much more information. The full MER are available in versions covering the NEC 2011, 2014, and 2017 code years.

## Key features

- Motor and wiring information
- Ampacity tables
- Conduit fill and grounding sizes
- Voltage drop calculations
- Conduit bending guide
- Integrated scientific calculator
- NEC code tables

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/master-electrician-ref-lite/id889449126/reviews.md

### 5/5 — Mr. electrician

*2023-08-18*

This app has helped me a lot in this job that I have, I recommend it

### 3/5 — USA only

*2019-12-01*

Most of it is not much good if you live outside of the USA which is a pity as it looks a great app

### 2/5 — Not to swell

*2019-06-12*

Just enough to tease ya .  
Not all info

**Developer response:** This is the Lite version. If you want more features, please see our full version of MER.

### 5/5 — The best ever

*2019-05-29*

It is the best App for an electrician

### 5/5 — The best there is

*2019-04-19*

Easy to find electrician information

### 2/5 — Lacking

*2017-10-12*

I had to find a new app when IOS11 came. I tried this one but the info seems to be lacking in many areas.

**Developer response:** This is the Lite version. If you want more features, please see our full version of MER.

## Frequently asked questions about Master Electrician Ref. Lite

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

Master Electrician Ref. Lite is an electronic pocket reference guide designed for electrical professionals. It provides quick access to essential information, including motor and wiring data, ampacities, grounding sizes, conduit fill tables, and voltage drop calculations. It also features a built-in scientific calculator and key tables from the National Electrical Code (NEC).

### What are the key features of this app?

Key features include detailed sections on motors and wiring, ampacities, conduit fill, grounding sizes, voltage drop calculations, and conduit bending. It also includes a general scientific calculator and relevant NEC tables. The app aims to replace traditional physical reference books with a convenient digital format.

### How much does Master Electrician Ref. Lite cost?

Based on the provided information, this application is a paid app. There is no mention of free access, subscriptions, or in-app purchases for core functionality, indicating a one-time purchase model.

### What are the common use cases for this app?

This app is useful for electricians, electrical engineers, inspectors, and contractors who need quick access to electrical code information, calculations, and reference tables while on the job. It's ideal for residential, industrial, and commercial electrical work, as well as for exam preparation.

### What versions of the NEC code does this app support?

The Master Electrician Ref. Lite app includes key NEC tables from the National Electrical Code (NEC) 2011. For users needing more recent code years, a full version of the MER app is available with support for NEC 2011, 2014, and 2017.

## Version history (last 5 releases)

### 2.0.8 — 2020-09-14

Bug fixes

### 2.0.7 — 2020-04-18

Bug fixes

### 2.0.6 — 2020-04-06

* Updated the NEC adoption map.
* Updated the Master Bender Manual.
* New "USA" color scheme.
* Miscellaneous minor tweaks.

### 2.0.5 — 2019-05-08

Try our new search feature. It is now easier than ever to find what you are looking for.

### 2.0.4 — 2019-04-24

► The Master Bender manual has been updated for Master Bender Gold.
► You can now share the app via an iMessage.
► New Spring theme.
► Various minor updates and fixes.

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## More apps by PawEng, LLC

- [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)
- [2017 Master Electrician Ref.](https://appshunter.io/ios/app/2017-master-electrician-ref/id1275949959)
- [Study Cards App](https://appshunter.io/ios/app/study-cards-app/id1583483972)
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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.*