A well-equipped garage workshop is one of the most satisfying home improvements you can make. Whether you are a serious woodworker, a weekend mechanic, or someone who just wants a functional space to tackle home repairs and projects, the electrical system is the backbone that makes it all work. Skimping on the electrical planning for your workshop means dealing with tripped breakers, underpowered tools, poor lighting, and safety hazards for years to come.
Here is a comprehensive guide to planning the electrical system for a garage workshop in Aiken, SC, covering everything from circuit planning and 240-volt outlets to lighting, sub-panels, and specific considerations for common workshop equipment.
Why Workshop Electrical Needs Are Different
A standard residential garage in Aiken typically has one or two 15-amp circuits serving a few outlets and a ceiling light fixture. That is adequate for parking cars, storing boxes, and occasionally using a drill or shop vacuum. It is nowhere near adequate for a working workshop.
Power tools draw significantly more current than household appliances. A contractor-grade table saw draws 13 to 15 amps at startup. An air compressor can draw 15 to 20 amps. A dust collector draws 12 to 15 amps. If any two of these tools are on the same 15-amp or 20-amp circuit, the breaker trips. Beyond the inconvenience, repeatedly tripping breakers or running circuits at near maximum capacity generates heat in the wiring, which is a fire hazard over time.
Proper workshop electrical planning means having enough circuits, the right circuit sizes, outlets where you need them, appropriate lighting, and the capacity to run your tools without compromise.
Starting with a Sub-Panel
For any serious workshop setup, the first decision is whether to add a sub-panel in the garage. A sub-panel is a secondary electrical panel fed from your main panel, providing dedicated circuit capacity for the workshop without overloading your home's existing circuits.
A sub-panel makes sense when your workshop will need more than two or three additional circuits, when your main panel is already near capacity, when the garage is detached or distant from the main panel, or when you want the convenience of having breakers right in the workshop rather than walking to the main panel every time you need to reset something.
A typical workshop sub-panel is a 60-amp or 100-amp panel fed from the main panel with appropriately sized wire. A 60-amp sub-panel provides enough capacity for most home workshops, while a 100-amp sub-panel provides headroom for heavy equipment, EV charger circuits, or future expansion. The sub-panel is fed by a double-pole breaker in the main panel, with the wire size determined by the amperage and the distance of the run.
For attached garages in Aiken homes, the wire run from the main panel to the sub-panel is typically short and straightforward. For detached garages, the wire must be run underground in conduit, which adds to the cost but is a common installation that we perform regularly.
Circuit Planning: What You Need and Why
Thoughtful circuit planning is the key to a workshop that works well. Here is a practical breakdown of the circuits a well-equipped workshop needs.
General-purpose 20-amp circuits. Plan for at least two to four 20-amp, 120-volt circuits for general outlet use. These serve bench-top tools like drills, routers, sanders, and grinders, as well as battery chargers, radios, and other light-duty items. Place outlets every four to six feet along the workbench wall and at least one outlet on each remaining wall. Having multiple circuits means you can run two tools simultaneously without tripping a breaker.
Dedicated 20-amp circuits for stationary tools. Any tool that draws close to the full capacity of a 20-amp circuit should have its own dedicated circuit. This includes table saws rated at 15 amps, miter saws, planers, and jointers. A dedicated circuit ensures the tool has the full power it needs without sharing with other devices, and it means a tripped breaker only affects that one tool.
240-volt circuits. Many serious workshop tools require 240-volt power, including larger table saws (3 HP and above), air compressors (5 HP and above), welders, plasma cutters, and some dust collectors. A 240-volt circuit delivers twice the voltage of a standard outlet, allowing tools to draw the same wattage at half the amperage, which improves efficiency and motor performance. Common 240-volt circuit sizes for workshops are 30-amp and 50-amp, depending on the specific tools.
Air compressor circuit. If you plan to run a stationary air compressor, it deserves special electrical attention. Compressor motors draw very high startup current, often three to five times their running current, for a brief moment when the motor starts. This startup surge can trip breakers that are sized only for the running current. A dedicated circuit with the proper breaker size, and in some cases a time-delay fuse or breaker, prevents nuisance tripping while still providing overcurrent protection.
Dust collection circuit. A central dust collection system, whether a single-stage collector or a two-stage cyclone, needs its own dedicated circuit. Most residential dust collectors draw 12 to 15 amps on a 120-volt circuit. If you run a larger system or a 240-volt dust collector, size the circuit accordingly. The dust collector typically runs simultaneously with whatever tool is producing the dust, so it cannot share a circuit with that tool.
Lighting: Do Not Underestimate This
Workshop lighting is one of the most overlooked aspects of garage electrical planning, and one of the most impactful. Poor lighting in a workshop is not just an inconvenience. It is a safety hazard. You cannot make accurate measurements, see cut lines, or notice potential dangers if you are working in dim or uneven light.
General overhead lighting. Plan for significantly more lighting than a standard garage. The Illuminating Engineering Society recommends 50 to 100 foot-candles for workshop tasks, compared to 10 to 20 foot-candles for general garage use. LED shop lights are the best choice for workshop overhead lighting. They are energy-efficient, produce minimal heat, turn on instantly, and are available in high color rendering index (CRI) versions that show true colors, which is important for finishing work. Plan for enough fixtures to eliminate shadows across your primary work areas.
Task lighting. In addition to overhead lighting, add task lighting directly over the workbench, the table saw, the drill press, and any other stationary work areas. Adjustable LED work lights or under-cabinet LED strips provide focused illumination right where you need it.
Lighting circuits. Put the workshop lighting on its own dedicated circuit, separate from the outlet circuits. This ensures your lights stay on even if a tool trips a breaker on an outlet circuit, and it keeps the lighting circuit from being affected by the voltage fluctuations that power tools can cause.
Workbench Power
The workbench is the hub of most workshops, and having convenient, accessible power at the bench makes a noticeable difference in daily use. Rather than a single duplex outlet on the wall behind the bench, consider installing a multi-outlet power strip or a series of outlets along the back edge of the bench at counter height. This puts power right where your hands are, eliminating the need to reach behind or under the bench to plug in tools.
A workbench power strip with built-in circuit protection and USB charging ports is a practical addition. Mount it at the back edge of the bench, about four to six inches above the work surface. If your bench has a pegboard or tool wall behind it, install outlets above the pegboard line so they remain accessible.
Consider adding one or two floor outlets or outlet posts near freestanding equipment in the center of the shop. These eliminate trip hazards from cords running across the floor to wall outlets and provide convenient power for tools that are not positioned against a wall.
Outlet Types and Placement
The types of outlets you install in your workshop matter. Standard 15-amp duplex outlets are fine for light-duty use, but 20-amp outlets are the better choice for workshop circuits. A 20-amp outlet has a T-shaped slot on the neutral side that accepts both 15-amp and 20-amp plugs, giving you maximum flexibility.
For 240-volt circuits, the outlet type depends on the amperage and the tools you plan to use. Common workshop 240-volt outlets include NEMA 6-20 (20 amps), NEMA 6-30 (30 amps), and NEMA 6-50 (50 amps). Install the specific outlet type that matches your equipment, and label each outlet with its voltage and amperage for safety.
GFCI protection is required by the NEC for all 125-volt, 15-amp and 20-amp outlets in garages. This applies to workshops as well. GFCI protection can be provided by GFCI outlets at each location or by GFCI breakers in the panel that protect entire circuits.
Planning for Future Expansion
One of the most common regrets workshop owners express is not planning for enough electrical capacity from the start. Your workshop needs today may not match your needs in five years. Installing a sub-panel with extra capacity and running conduit to make future circuit additions easy costs relatively little during the initial installation but saves significant money if you need to add circuits later.
If you are considering adding an EV charger circuit in the garage, a welder, or a mini-split HVAC system for workshop climate control, plan for these circuits now even if you are not installing them immediately. Running the wiring and installing the breakers during the initial workshop electrical project is far less expensive than coming back later to add them.
Next Steps
Unity Power & Light designs and installs workshop electrical systems for homeowners throughout Aiken, SC and the surrounding CSRA area. We work with you to understand your tools, your workflow, and your future plans, then design an electrical system that supports all of it. From sub-panel installation to 240-volt circuits, LED lighting, and dedicated tool circuits, we handle every aspect of the project with proper permitting and inspection.
Contact us for a workshop electrical consultation. We will visit your garage, discuss your plans, and provide a detailed estimate for the complete project.