# SLD Sizer for Engineering — Single Line - One Line Diagram > Electrical engineering reference for wire and conduit sizing based on NEC. (iPhone/iPad app by KP Phillips.) - Source: https://appshunter.io/ios/app/sld-sizer-for-engineering/id385456839 (this page in markdown: same URL + `.md`) - Developer: [KP Phillips](https://appshunter.io/developer/385456842) - Category: Reference, Utilities - Price: Free - Rating: 4.30/5 from 7 App Store ratings · 14 written reviews indexed - Age rating: 4+ - Requires: iOS 10.0 · 16 MB - Languages: American English - Released: 2010-08-08 - Data updated: 2026-06-21 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/sld-sizer-for-engineering/id385456839/reviews.md ## What is SLD Sizer for Engineering? Single Line Diagram Sizer is a reference tool for electrical engineers, designers, and contractors to verify wire and conduit sizes based on selected load. All data is based on the NEC and results provide minimum requirements. This app is used as a quick reference for designing or verifying design drawings or installations. ## Key features - Wire and conduit sizing - Load-based calculations - NEC data compliance - Design verification - Quick reference tool ## Recent user reviews (10 of 14) All indexed reviews: https://appshunter.io/ios/app/sld-sizer-for-engineering/id385456839/reviews.md ### 4/5 — Derating *2012-11-22, version 2.0* Great app, wish the derating scale had option for F* or C* ambient. Also would be nice to have length of wire run scale. ### 3/5 — Important Ground Conductor Distinction *2012-07-26, version 2.0* The ground conductor indicated is actually sized to be a Grounding Electrode Conductor for a Service Entrance. I believe that most folks would prefer, and may be assuming, that it was sized as an Equipment Grounding Conductor. Beware of this distinction when using this App! ### 5/5 — Great *2012-07-05, version 2.0* Exactly what I needed! ### 5/5 — Just what I've been looking for *2012-05-01, version 2.0* Sizes my wires, does motor calcs. What else do you need? ### 2/5 — Doesn't reference breaker sizes *2011-02-17, version 1.1* Should reference circuit breaker sizes instead of wire ampacities when making selections ### 1/5 — Clearly not made by an electrician *2011-01-29, version 1.1* Terrible, this app can lead to the death of you and your family if you don't already know what you are doing....full of mistakes. ### 3/5 — Close to good *2011-01-07, version 1.1* It would be nice if there were options for insulation ratings, conduit types, etc. I would pay actual money for one that was more comprehensive and as easy to use as this one. For now, this one is easily worth what it cost. ### 1/5 — Lame *2011-01-01, version 1.1* One equation on the wheel is even wrong. The sizing doesn't take any de-rating factors into account. Here in Canada anyways, it's not that simple. ### 2/5 — Ok program, electrical *2010-11-23, version 0* Needs more info, it's ok ### 5/5 — Great app *2010-11-21, version 0* Fantastic! ## Frequently asked questions about SLD Sizer for Engineering ### What is SLD Sizer used for? SLD Sizer is a reference tool for electrical engineers to verify wire and conduit sizes based on selected load. It provides minimum requirements according to the NEC, aiding in design verification. ### Is SLD Sizer free to use? Yes, SLD Sizer is available for free. There are no in-app purchases or advertisements associated with this application. ### What electrical standards does SLD Sizer follow? All data and results provided by SLD Sizer are based on the National Electrical Code (NEC), ensuring compliance with industry standards for minimum requirements. ### What devices is SLD Sizer compatible with? SLD Sizer is compatible with iPhone and iPod devices. It is designed for iOS operating systems. ### How often is SLD Sizer updated? The latest version of SLD Sizer, 2.1, was released on October 15, 2017. The app was initially released on August 8, 2010. ### What is the age rating for SLD Sizer? SLD Sizer has an age rating of 4+, making it suitable for a wide range of users including younger individuals learning about electrical engineering concepts. ### Can SLD Sizer be used for new designs or just verification? SLD Sizer can be used for both designing new electrical systems and verifying existing design drawings or installations. It serves as a quick reference for these tasks. ## Version history (last 5 releases) ### 2.1 — 2017-10-15 This app has been updated by Apple to display the Apple Watch app icon. - App Rewritten from the ground up. - Automatic calculation updates. - Refreshed interface. ### 2.0 — 2012-02-08 Reprinted with permission from NFPA 70® -2011, National Electric Code®, Copyright C 2010, National Fire Protection Association, Quincy, MA. This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety. - Enter the load in amps with the keyboard. - Added 3D graphic of conduit and conductors to help visualize conductor quantity. - Now calculates conduit fill and displays result. - You can now select insulation and conduit type. - Derating for ambient temperature now included. NFPA 70®, National Electric Code® and NEC® are registered trademarks of the National Fire Protection Association, Quincy, MA. ### 1.2 — 2011-03-28 - Added areas for conductors and conduit. - Clarified default values included in calculation in the “About:” section. - Revised typo on ohm’s wheel. - Also, more changes and features to come based on user comments. ### 1.1 — 2010-08-28 - Revised to work on older versions of iOS - Added reference equations for Ohms Law to find watts, amps, voltage, and ohms. - New look and interface. ### 1.0 — 2010-08-08 No release notes. ## Apps similar to SLD Sizer for Engineering | App | Rating | Price | Category | | --- | --- | --- | --- | | [Wire (AWG) Calculator](https://appshunter.io/ios/app/wire-awg-calculator/id1526471471) | 4.2 (6) | Free | Reference | | [Pump Cable Calculator](https://appshunter.io/ios/app/pump-cable-calculator/id794963707) | 4.3 (6) | Free | Reference | ## More apps by KP Phillips - [Viewer 360](https://appshunter.io/ios/app/viewer-360/id1332241273) All apps by KP Phillips: https://appshunter.io/developer/385456842 ## Related topics [sld sizer for engineering](https://appshunter.io/ios/topics/sld-sizer-for-engineering) · [tasker for engineers](https://appshunter.io/ios/topics/tasker-for-engineers) --- *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 2026-06-21.*