Electrical Load Calculator
NEC-compliant load, voltage drop, and conductor sizing in seconds.
Stop juggling spreadsheets and PDFs of NEC Article 220. EngineSuite runs service load, demand factors, voltage drop, and conductor ampacity in one place — with an AI assistant that cites the exact NEC article behind every result.
What you get
Service & feeder sizing
Calculate total connected load, apply demand factors, and size service entrance conductors per NEC 220 and 230.
Voltage drop & ampacity
Run voltage drop checks for copper and aluminum across single and three-phase systems. Ampacity tables follow NEC 310.
Branded PDF in one click
Export a stamped, signed-ready report with your firm's logo, project info, and every NEC citation embedded.
Unlimited calculators and AI. Pay only when you need a stamped PDF.
Every result tells you the exact clause behind the number.
Your firm's logo, project info, and citations — one click.
Frequently asked questions
Which NEC edition does the calculator use?
EngineSuite tracks the latest published NEC edition (NFPA 70) with toggles for prior cycles where firms still design to older code.
Can the AI assistant explain a code clause?
Yes. Ask 'why does NEC 220.61 apply here?' and the AI cites the article and explains the calculation in context.
Is EngineSuite free for students?
Yes. Students and EITs with a valid academic or professional email get free access to every calculator and the AI assistant. You only pay if you need a stamped PDF report.
Can I export branded PDF reports?
Yes. Every calculation can be exported as a one-click branded PDF with your company logo, name, and project metadata. Pro plans include unlimited exports.
Try it on your next project
Sign up free, run a calculation, and see the code citations for yourself.