Underground Circuits
Underground Electrical Installation in Washington County, IN
Twisted Electric LLC installs underground electrical circuits for residential and commercial properties across Washington County and Southern Indiana. We trench, lay conduit, pull wire, make connections at both ends, and backfill, all with our own crew and equipment. Most electricians have to call in a separate excavation contractor for the trench. We run N&M Excavating in-house, so the digging and the wiring happen on the same day.
Underground Circuits
What Underground Electrical Work Involves
Underground electrical is any wiring that runs below grade, buried in conduit from one structure to another, or from a utility transformer to your meter base. It’s how power gets to detached garages, workshops, barns, pool equipment, outdoor kitchens, and outbuildings that aren’t connected to the main structure.
The work involves trenching to the required burial depth, laying PVC or rigid conduit, pulling the appropriate gauge wire through the conduit, making weatherproof connections at each end, and backfilling and compacting the trench. NEC Article 300 and local code set the minimum burial depth, typically 18 inches for PVC conduit in residential applications and 24 inches for direct burial cable without conduit.
Getting this wrong creates problems. Conduit buried too shallow gets cut by a landscaper or a fence installer. Wire pulled through undersized conduit overheats. Connections made without proper weatherproof fittings corrode and fail. We install underground circuits to code because fixing a failed underground run means digging it all up and starting over.
Common Projects
Where We Install Underground Circuits
Detached Garages & Workshops
Running a sub-panel feed from the house to a detached garage or workshop. We trench from the main panel location, lay schedule 40 PVC conduit at proper burial depth, pull the feeder conductors (typically #6 or #4 copper for a 60A or 100A sub-panel), and set the sub-panel in the garage. The result is a dedicated electrical system for your garage, separate breakers, separate circuits, enough capacity for power tools, a welder, air compressor, or vehicle lift.
Barns & Agricultural Outbuildings
Underground service feeds from the main meter or panel to pole barns, hay barns, livestock facilities, and farm shops. Agricultural runs are often longer, 100 to 500+ feet, which means voltage drop calculations matter. We size the conductor based on the load and the run distance so you're not losing voltage by the time the power reaches the building. All underground agricultural installations meet NEC Article 547 requirements.
Pool & Hot Tub Equipment
Underground conduit runs from the main panel to pool equipment pads, pump motors, heaters, filter systems, and lighting transformers. Pool electrical has specific bonding and grounding requirements under NEC Article 680, and the underground portion has to maintain proper separation from the pool shell and deck. We handle the trench, the conduit, the wiring, and the equipment connections as one scope.
Outdoor Kitchens & Living Spaces
Underground circuit runs to outdoor kitchens, pergolas, pavilions, fire pit areas, and detached entertaining spaces. Typically 20-amp GFCI-protected circuits for outlets and dedicated circuits for built-in appliances like grills, refrigerators, or pizza ovens. We also run underground feeds for landscape lighting transformers and post light circuits.
New Construction Service Entrance
On new builds, the service entrance cable from the utility transformer to the meter base runs underground. We coordinate with the utility company (Duke Energy, Indiana Michigan Power, etc.) on transformer placement, trench the service lateral, install the meter base and main panel, and make the connection ready for the utility to energize. Includes temporary power pole setup during construction.
RV Hookups & Accessory Structures
30-amp and 50-amp RV hookup pedestals, she-sheds, tiny homes, storage buildings, and any accessory structure that needs its own electrical service. We trench from the main panel, run the underground feed, and install a properly rated disconnect or sub-panel at the structure. The circuit is dedicated, it doesn't share load with the house.
Our Advantage
We Dig It and We Wire It
On a typical underground electrical project, you’d hire an electrician and a separate excavation contractor. The electrician marks where the trench needs to go. The excavator digs it whenever they’re available. The electrician comes back to lay conduit and pull wire. The excavator comes back again to backfill. Four visits, two schedules, two invoices, and plenty of opportunities for miscommunication about depth, route, or timing.
We handle the whole job. N&M Excavating, our in-house excavation division, digs the trench. Our electricians lay the conduit, pull the wire, and make connections at both ends. Our excavation crew backfills and compacts. One day. One crew. One bill.
How It Works
How We Handle Underground Installation
Site Assessment
We walk the property, identify the trench route, check for existing underground utilities (we call 811 / Indiana Underground Plant Protection Service before any dig), and determine burial depth based on the type of conduit and local code requirements.
Trenching
Our excavation crew trenches to the required depth along the planned route. For runs near foundations, driveways, or existing utilities, we hand-dig or use a compact trencher to avoid damage. Longer runs across open ground are trenched with a skid steer or dedicated trenching machine.
Conduit, Wire & Connections
We lay schedule 40 PVC conduit (or rigid metal conduit where code requires it), pull the correctly sized conductors through the run, and make weatherproof connections at each end. Sub-panels get mounted, breakers get installed, and circuits get tested before we call for inspection.
Backfill & Restoration
Trench gets backfilled in lifts with proper compaction. If the trench crosses a driveway, sidewalk, or landscaped area, we restore the surface to pre-construction condition. Sod, gravel, or aggregate — whatever was there before goes back.
Service Areas
Serving Washington County & Southern Indiana