LLC Installation Techniques 4

Question 1

When installing a transformer on an exterior wall, what is the minimum height above grade required to protect it from lawn irrigation overspray and flooding?

Accepted Answer

12 inches

Answer

Mounting the transformer at least 12 inches above grade protects it from routine irrigation splash, pooling water, and most flood events.

Question 2

What is the recommended maximum wire run length using 12 AWG cable from a single 12V tap on a transformer before significant voltage drop degrades fixture performance?

Accepted Answer

150 feet

Answer

With 12 AWG cable, runs up to about 150 feet from a 12V tap typically keep voltage drop within acceptable limits for most LED landscape fixtures.

Question 3

When installing uplights for a group of palm trees arranged in a triangular cluster, which placement approach produces the most dramatic effect?

Accepted Answer

Individual fixtures at the base of each tree angled inward toward the trunk

Answer

Placing an individual uplight at the base of each palm angled toward its own trunk highlights each tree's unique form and creates layered depth.

Question 4

What does 'grazing' mean as a landscape lighting technique?

Accepted Answer

Placing a fixture very close to a textured surface so light rakes across it, emphasizing texture

Answer

Grazing positions a fixture just inches from a textured surface—brick, stone, bark—so light skims across it at a sharp angle, dramatically revealing surface texture.

Question 5

After installation, a technician notices one zone of path lights is noticeably dimmer than others. The FIRST diagnostic step should be:

Accepted Answer

Measure voltage at the first and last fixture in the zone with a multimeter

Answer

Measuring voltage at the beginning and end of the zone identifies whether the problem is excessive voltage drop, a loose connection, or an undersized cable.

(LLC) Landscape Lighting Certification Practice Test

(LLC) Landscape Lighting Certification Practice Test

LLC Installation Techniques 4