Electrical Engineering Apps,
Books & Tools
Professional iOS apps, Kindle reference books, and a free browser-based 3D viewer covering the full scope of NEC-compliant electrical design — from residential branch circuits to commercial power distribution.
What's in the Electrical Studio
Residential 3D Viewer
Interactive Three.js viewer of a full single-family house — service, panel, AFCI/GFCI breakers, branch circuits, lighting, EV charger, smoke/CO detectors, and color-coded wiring per circuit.
NEC Load Calculator
Article 220 residential and commercial load calculations — general lighting, small appliance circuits, laundry, dryer, range, HVAC, and EV charger loads.
Panel Scheduler
Build and export panelboard schedules with circuit descriptions, breaker sizes, wire gauges, and load summaries.
Voltage Drop Calculator
NEC-compliant voltage drop for single-phase and three-phase circuits — conductor sizing, distance, load, and power factor inputs.
NEC Reference Books
10+ Kindle books covering NEC Articles 220, 250, 310, 408, 430, conduit fill (Chapter 9), grounding, motor circuits, and generator sizing.
PE / FE Exam Prep
Power PE and FE Electrical exam apps with practice questions on load flow, protection, transformer theory, and NEC compliance.
NEC Articles Covered
EngineersUniverse apps and books address the most commonly used NEC articles in residential, commercial, and industrial electrical design:
Frequently Asked Questions
What does EngineersUniverse offer for electrical engineers?
EngineersUniverse provides 30+ NEC-based iOS apps covering load calculations (NEC Article 220), panel scheduling, voltage drop, AFCI/GFCI requirements, conduit fill (NEC Chapter 9), service sizing, and more. We also publish Kindle reference books and offer a free browser-based 3D residential electrical viewer.
Which NEC articles are covered in the electrical engineering apps?
Our apps cover NEC Articles 100, 200, 210, 220, 225, 230, 240, 250, 310, 334, 352, 358, 404, 406, 408, 410, 422, 424, 430, 445, 480, 690, and 700 among others — from branch circuits and feeders to grounding, motors, generators, and solar PV.
Is there a free electrical engineering design tool?
Yes. The Residential Electrical 3D Viewer (free in the Electrical Engineering Studio) is an interactive browser-based tool built with Three.js. It visualizes service entrance, main panel, AFCI/GFCI breakers, branch circuits, lighting, smoke/CO detectors, EV charger, and low-voltage systems with color-coded wiring per circuit and NEC code references for every device.
Do the apps help with PE exam prep?
Yes. Several apps are designed for the Power PE exam and FE Electrical exam, covering transformer theory, motor circuit design, protection coordination, load flow concepts, short-circuit calculations, and NEC compliance checks.