CSLB C-27 Landscaping ContractorHardscape and FeaturesHard
A landscape contractor is planning to install a series of low-voltage path lights along a curving walkway. To ensure consistent brightness across all fixtures and avoid noticeable dimming at the end of the run, what is the most effective wiring method?
- ADaisy-chaining all fixtures from a single starting point.
- BEmploying a single, heavier gauge wire for the entire run.
- CConnecting fixtures in a series circuit.
- DUsing a hub-and-spoke (or 'star') wiring method.
Show answer & explanationAnswer & explanation
Correct answer: D. Using a hub-and-spoke (or 'star') wiring method.
The hub-and-spoke (or 'star') wiring method provides the most consistent voltage and brightness. Each fixture or a small group of fixtures is wired directly back to a central transformer or junction point using its own dedicated wire run. This minimizes voltage drop and ensures even illumination, unlike daisy-chaining or series circuits which exacerbate voltage drop over distance.
Why the other options are wrong
- A. Daisy-chaining (connecting fixtures sequentially) leads to significant voltage drop and dimming at the end of the run.
- B. While a heavier gauge wire helps reduce voltage drop, it may not be sufficient for very long runs or high wattage, and the hub-and-spoke method is generally more effective for consistent brightness across multiple fixtures.
- C. Connecting fixtures in a series circuit is highly problematic for low-voltage landscape lighting, as if one bulb fails, all subsequent bulbs in the series will go out, and it also leads to voltage drop issues.
Low-Voltage Lighting Wiring Methods
Different ways to connect low-voltage landscape lighting fixtures to a power source, impacting voltage consistency and brightness.
- Daisy-chaining causes voltage drop.
- Hub-and-spoke minimizes voltage drop.
- Series circuits are generally avoided.
Memory trick: To keep all lights BRIGHT, each needs its own SHORT path to the power hub, not a long chain.