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Electrical Engineering Studio

NEC 220 Load Calc Arc Flash Motor Sizing Conduit Fill IEEE 1584 PE/FE Exam

🛠️ Design Tools 3

🌐 3D Web Apps 4

🧮 Calculators 12

📚 Articles 21

📥 Downloads

Residential Electrical DesignerLIVE

NEC 220 load calculation, panel schedule with AFCI/GFCI, single-line diagram, voltage drop (K-factor), grounding worksheet (NEC 250), and permit-ready package.

NEC 220AFCI/GFCIVoltage Drop

Commercial Electrical System DesignerLIVE

NEC 220 Part III/IV — 3-phase service, step-down transformer, panelboards, emergency/standby (700/701/702), fire pump (695), and a permit-ready package.

NEC 220 III/IV3-PhaseSwitchboard

Power Substation DesignerLIVE

IEEE 551 short circuit study, protection coordination, ground grid (IEEE 80), arc flash (IEEE 1584), single line diagram, and permit package.

IEEE 551IEEE 80Arc Flash

Residential Electrical 3D ViewerLIVE

Interactive 3D house — service entrance, main panel, AFCI/GFCI breakers, branch circuits, EV charger, smoke/CO detectors. Click any device for NEC code references.

3D InteractiveNECEV Charger

Residential 3D Interactive DesignerLIVE

Split-screen — 3D two-story dwelling + live one-line/panel schematic. Click any device or node to cross-highlight across both views with NEC 2020 references.

3D + One-LineCross-HighlightNEC 2020

Commercial 3D Interactive DesignerLIVE

3-story commercial building — utility service, main switchboard, transformers, floor panelboards, branch circuits, and emergency/standby system with generator and ATS.

3D + One-LineCommercialNEC 700/695

Power Substation 3D InteractiveLIVE

138 kV / 13.8 kV transmission substation — 3D switchyard alongside IEEE single-line. Click any component to inspect 54 devices across 8 systems: protection, relay, grounding, feeders.

3D + SLD138 kVRelay Protection

NEC Load CalculatorLIVE

NEC 220 demand load with service entrance sizing.

NEC 220Demand Load

Voltage Drop CalculatorLIVE

NEC 210.19 — branch circuit and feeder drop within 3%.

NEC 210.19Feeders

Conduit Fill CalculatorLIVE

NEC Chapter 9 — EMT, RMC, PVC, LFNC fill compliance.

NEC Ch. 9Fill %

Wire Ampacity & DeratingLIVE

NEC 310.15 with temperature and bundling correction factors.

NEC 310.15Derating

Arc Flash Incident EnergyLIVE

IEEE 1584 — cal/cm², PPE category, arc flash boundary.

IEEE 1584PPE Category

Motor Branch Circuit SizingLIVE

NEC 430 — conductor, OCPD, overload relay, disconnect.

NEC 430FLA

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NEC Electrical Code: A Practical Guide for Contractors and Engineers

8 min

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Electrical Load Calculations: How to Size Panels and Conductors

7 min

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How to Size a Residential Electrical Panel: Step-by-Step Load Calculation

10 min

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GFCI vs AFCI: What Is the Difference and Where Are They Required?

7 min

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Arc Flash Hazard Analysis: What Every Electrical Engineer Needs to Know

9 min

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NEC 2023 Key Changes: What Electrical Engineers and Contractors Need to Know

9 min

📖 NEC Electrical Design Reference

14 sections · Interactive Reader

Interactive 14-section NEC 2023 guide: load calculations, ampacity tables, motor circuits, grounding, conduit fill, voltage drop, and one-line diagram reading.

📐 Commercial Electrical System Design Drawings Set

PDF · 1.93 MB

Full commercial electrical design drawing set including single-line diagrams, panel schedules, lighting plans, and power distribution layouts.

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