Low-voltage systems explained
Most landscape lighting runs on low voltage supplied by a transformer that plugs into or is hardwired to a 120-volt outdoor circuit. The transformer steps voltage down, and low-voltage cable runs to each fixture. Low voltage is much safer to work around in beds and lawns.
Problems usually come from undersized transformers, long cable runs that cause dim fixtures at the end, or outlets without proper GFCI and weather protection. An electrician can add a dedicated outdoor outlet where the transformer needs to go.
What the work typically involves
Design the layout
Choose what to light and how, and estimate total wattage.
Provide power
Install or verify a GFCI-protected outdoor outlet with an in-use cover.
Install transformer and cable
Mount the transformer and run cable sized for the load and distance.
Place and adjust fixtures
Set fixtures, adjust aim and program controls.
Common reasons homeowners call
- Lighting walkways for safety
- Highlighting trees and gardens
- Lighting the front of the house
- Fixing dim or dead fixtures on an existing system
- Adding power where the transformer needs to mount
Common landscape lighting problems
- Fixtures at the end of a run are dim
- Transformer trips its breaker or runs hot
- Corroded connectors
- Outlet powering the transformer isn't GFCI protected
- Cable nicked by mowers or edgers
Safety considerations
Keep line voltage protected. Only the low-voltage side should be in garden beds. The 120-volt connection belongs in a weatherproof, GFCI-protected outlet with an in-use cover.
What an electrician will check
- Outdoor outlet and GFCI protection
- Transformer size and mounting
- Cable gauge versus run length
- Connections and splices
- Timer and photocell operation
Related electrical problems
Related residential services
Outdoor Lighting
Exterior lighting for porches, patios, decks, driveways and walkways — wired and rated for outdoor use.
Security Lighting
Motion-activated floodlights and dusk-to-dawn lighting to light entries, driveways and the sides of your home.
GFCI Outlet Installation
Adding GFCI shock protection to kitchens, bathrooms, laundry rooms, garages, basements and outdoor outlets.
Smart Lighting
Smart switches, dimmers, scenes and app or voice control for indoor and outdoor lighting.
Frequently asked questions
Low-voltage systems carry much less shock risk than standard wiring. The 120-volt supply should still be GFCI protected.
Long runs lose voltage. Changing the cable layout, cable size or transformer taps usually evens it out.
Often, if the transformer has spare capacity. An electrician can check the load.