LLC Troubleshooting & Diagnostics 2

Question 1

A low-voltage landscape lighting system has several fixtures that flicker intermittently. What is the most likely cause?

Accepted Answer

Loose wire connections at the fixture or splice

Answer

Loose wire connections cause intermittent contact, resulting in flickering rather than a complete outage.

Question 2

When using a clamp meter to measure current on a low-voltage cable, the reading is 0 amps even though the transformer is energized. What should you check first?

Accepted Answer

Confirm the clamp is around only one conductor, not both

Answer

Clamping around both conductors causes the opposing currents to cancel, producing a false zero reading.

Question 3

A transformer's GFI (GFCI) outlet keeps tripping whenever a specific lighting zone is activated. What does this most likely indicate?

Accepted Answer

There is a ground fault or current leakage on that zone's wiring or fixtures

Answer

A GFCI trips when it detects current leaking to ground, indicating a fault in the zone's wiring or a compromised fixture.

Question 4

After a heavy rain, multiple LED path lights in a low-spot zone stop working. The most probable cause is:

Accepted Answer

Water infiltration causing a short circuit in the fixtures or connectors

Answer

Water entry into non-watertight fixtures or connectors creates short circuits that cut power to the zone.

Question 5

A technician measures 11.8 VAC at the transformer terminal but only 9.5 VAC at the end of a long cable run. What adjustment should be made?

Accepted Answer

Replace the cable with a lower-gauge (thicker) wire or shorten runs

Answer

Voltage drop over long runs is reduced by using heavier-gauge wire or splitting the run, bringing end-of-run voltage into the acceptable range.

(LLC) Landscape Lighting Certification Practice Test

(LLC) Landscape Lighting Certification Practice Test

LLC Troubleshooting & Diagnostics 2