An electrician needs to fit two 14/3 cables in a standard 4-inch octagon box for smoke detector interconnections but is being told it may violate code due to box fill limits.

No accessible tool or app to quickly calculate NEC box fill limits and check code compliance for a given box and cable configuration on the job site.

Severity

3Medium

Willingness to Pay

implied

Added

Jun 3, 2026

App Concept

BoxFill Pro

A mobile-first app that lets electricians enter box dimensions and wire counts to instantly determine code compliance per NEC 314.16. Includes visual diagrams, code references, and material recommendations. Eliminates guesswork and reduces callbacks from inspectors.

Key Features

Input box type, size, and wire gauge/conductor count to compute total fill and remaining capacity
Show color-coded compliance status (pass/warning/fail) with NEC section citations
Recommend larger boxes or alternative configurations when current selection fails
Save job-specific box layouts and share reports with foremen or inspectors

Target Users: Electricians and electrical contractors in residential and commercial construction, especially those doing rough-in work for smoke detectors, switches, and outlets.

Revenue Model: $4.99/mo per user subscription or $29.99 annual; free tier limited to basic box checks with ads.

Want to go deeper?

Sign up to save ideas, run AI analysis, and track opportunities in your personal workspace. Founding members get full access.

Join Beta

Solutions (0)

Discussion (0)

No comments yet