How to Easily Run Electrical Wires Underground for Garden Lighting


Installing low-voltage lighting in your garden can transform the look and feel of your outdoor space. Rather than running unsightly wires above ground, running the wiring underground is an easy way to keep things neat and tidy. This article will walk you through the complete process of running electrical wires underground for garden lighting.

Things You Will Need

Before getting started, make sure you have the necessary materials and tools:

The specific materials you need will depend on the number and type of lighting fixtures in your setup. When purchasing wire, conduits, and other electrical components, consult an electrician or hardware store expert to ensure everything is properly rated and sized for your system.

Planning the Layout

Carefully plan out where you want to place each lighting fixture in the garden. Consider what areas you want to highlight or illuminate. Decide where the wiring will run underground to connect each light.

Here are some layout tips:

Proper planning is crucial to ensure you purchase the correct amounts of lighting, wire, and conduit. It also makes installation much simpler.

Digging the Trenches

Once your lighting plan is set, it's time to dig the trenches for the wires.

Tools Needed

How to Dig

Digging deeper provides better protection for the wires. The trenches should follow the paths between each light fixture based on your lighting plan.

Safety Tips

Running the Conduit Pipes

After digging the trenches, you can install the electrical conduits that will house the wires underground:

Steps for Installing Conduits

  1. Measure and cut the PVC conduit pipes to the needed lengths using a hacksaw
  2. Place conduits end-to-end in the bottom of the trenches
  3. Join conduit sections using slip couplings and solvent glue
  4. Place pull boxes in runs longer than 100 feet for easier wire pulling
  5. Attach cover caps on any stubbed-out conduit ends

Conduit provides protection for the wiring and makes it easy to pull the conductors through. Use sweeps and elbows as needed to route around corners and obstacles.

Feeding the Wires Through the Conduits

With the conduits laid in the trenches, you can start running the electrical wires:

Running the Wires

Take care not to kink or damage the wire insulation while pulling through the conduits. Wear gloves to protect your hands.

Splicing Wires

Moisture is a top concern for underground connections. Take steps to ensure all splices stay dry and corrosion-free.

Connecting the Light Fixtures

After running wiring to each fixture location:

Double check that all fixtures are wired properly before restoring power. Consult wiring diagrams as needed.

Restoring the Area

Once the light fixtures are wired and connected, finish up:

Take care to avoid settling trenches which could leave unsafe depressions. Inspect the area thoroughly once restored and make any needed adjustments.


When installed properly, running your garden lighting wires underground provides a clean look and sturdy protection. Plan things out, take your time, and use quality materials to ensure success. Wired lighting enables stunning nighttime displays in your garden and yard.