Owen Marsh

Owen writes practical guides to cable sizing and voltage drop, always with the reminder that final selections belong with a licensed electrician.

How articles get written

Every guide on Cable Size Calculator starts with a real question readers ask about electrical cable sizing, wire ampacity, and voltage drop for NEC-compliant wiring. Drafts are researched against reputable sources, edited for clarity, and updated when best practices change. Nothing is published to fill space: if a topic doesn't deserve a full answer, it doesn't get an article.

Corrections & contact

Spotted something out of date or plain wrong? Email runbookify@gmail.com and it will be fixed. See the About page for how the site is funded.