Fort Mill 100A Subpanel Installation, Trenching & Feeder Run

Project overview

Touchstone Electric completed a 100A subpanel feeder installation in Fort Mill, delivering a safe, code‑compliant upgrade for reliable capacity and room to expand. The scope included a new feeder run with trenching and careful terminations using a junction box and mechanical lugs to ensure long‑term performance.

Scope of work in Fort Mill

• Installed a 100 amp subpanel feeder from the main service to the new subpanel location.
• Pulled approximately 100 ft of 4‑wire feeder (SER) to provide dedicated, balanced power with an equipment grounding conductor.
• Completed 75 ft of trenching and backfill for the underground portion of the feeder route, keeping clearances and burial practices aligned with local requirements.
• Added a rated junction box and Polaris mechanical lugs for secure, accessible splicing and transitions.
• Utilized an electrical apprentice to support pulling conductors, trench safety, and cleanup, helping the lead electrician work efficiently.
• Performed final checks for tight terminations, proper labeling, and clean routing to maintain serviceability and safety.

Materials and methods

For this 100A subpanel installation, our Charlotte branch crew sourced listed materials suited to residential feeder work and followed best practices for durability and compliance.

• 4‑wire feeder cable (SER): Provides two hots, a neutral, and an equipment grounding conductor to the subpanel, supporting a balanced 120/240V load and clear fault paths.
• Mobile home feeder cable (as specified): A listed feeder option used where suitable for the routing and installation conditions on this project.
• Junction box with Polaris lugs: Mechanical set‑screw connectors inside a properly sized, accessible enclosure for reliable splicing and future service access.
• Neutral/ground separation at the subpanel: Ensures the grounding system remains isolated from the neutral in the downstream panel, aligning with common residential code practice.
• Verified conductor routing and support: Proper securing, protection through transitions, and neat organization for labeling and maintenance.

Trenching done right

Our team completed about 75 feet of trenching and backfill to route the feeder safely underground. We plan routes to respect property features, maintain drainage, and protect the cable with appropriate cover. Backfill was compacted to reduce settling and preserve the finished grade, and the path was cleaned up so the area is ready for normal use.

Why homeowners choose a 100A subpanel

• Added capacity: Supports new circuits for EV charging, workshops, outdoor living spaces, or future renovations.
• Convenience and organization: Shorter branch runs and a dedicated panel for specific areas or projects.
• Safety and compliance: Modern equipment, proper grounding, and clear labeling improve reliability and peace of mind.
• Future‑ready: Provides room to grow without overloading the main panel.

Local expertise from our Charlotte branch

Based out of our Matthews location, Touchstone Electric serves Fort Mill and the greater area with licensed electricians who specialize in panel upgrades and subpanel installations. Lead technician Chris Rogers managed this project to deliver a clean, code‑aligned installation that fits the homeowner’s plans for expansion.

Customer feedback

Jason Thompson praised our team with a Google review. Read the customer’s feedback: View the Google review

Need a subpanel installed in Fort Mill?

If you’re planning a panel or service upgrade, our team can assess your load needs, map the best feeder route, and deliver a tidy installation that’s ready for years of dependable use. Contact Touchstone Electric’s Charlotte branch to schedule your subpanel installation in Fort Mill.