An electrician needs to bring old 3-wire subpanels up to modern code (separate grounds and neutrals) without running a new feeder, and the customer refuses panel replacement.

No purpose-built solution exists to retrofit old subpanels for ground/neutral separation without pulling new cable; electricians resort to GFCI breakers and piecemeal workarounds.

Severity

3Medium

Willingness to Pay

implied

Added

Jun 5, 2026

Workarounds Described

adding gfci breakers to receptacles

App Concept

SubPanel RetroKit

SubPanel RetroKit is a modular retrofit kit that allows electricians to upgrade old 3-wire subpanels to modern 4-wire standard without running new feeder. It includes a pre-wired isolation bus bar assembly, bonding jumper removal tool, and GFCI adapter modules that fit existing breaker slots, reducing labor and material costs.

Key Features

Plug-in isolation bus bar that fits common old panel enclosures
Bonding jumper removal and replacement kit
Adapter modules to convert existing breakers to GFCI without full replacement
Step-by-step video instructions for code-compliant installation

Target Users: Licensed electricians and electrical contractors performing residential and commercial panel upgrades

Revenue Model: $150 per kit with bulk discounts, plus $29/mo subscription for code updates and installation documentation

Existing Solutions Mentioned

GFCI breakers

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