LLC Installation Techniques 3

Question 1

When calculating the load for a 150-watt low-voltage transformer, what is the maximum total wattage of fixtures that should be connected to stay within the 80% rule?

Accepted Answer

120 watts

Answer

The 80% rule limits connected load to 80% of transformer capacity; 80% of 150W = 120W to prevent overheating and extend transformer life.

Question 2

Which type of landscape light fixture is most appropriate for wash-lighting a masonry retaining wall from a distance of 1–2 feet?

Accepted Answer

Flood fixture with a 60° beam angle

Answer

A flood fixture with a wide 60° beam covers the broad surface of a retaining wall evenly when placed 1–2 feet away.

Question 3

When installing fixtures in a zone with significant elevation changes, voltage drop will be MOST severe at:

Accepted Answer

The fixture at the highest elevation on the longest cable run

Answer

Voltage drop increases with cable length; the fixture farthest from the transformer on the longest run—often at the highest elevation—will experience the greatest drop.

Question 4

Which wire gauge carries the most current and is preferred for long landscape lighting runs exceeding 100 feet?

Accepted Answer

12 AWG

Answer

12 AWG has the lowest resistance of the common landscape wire sizes, making it best suited for long runs to minimize voltage drop.

Question 5

When installing an in-ground well light in a lawn area, what feature should the fixture have to withstand regular lawn mower traffic?

Accepted Answer

A tempered glass or polycarbonate flush-mount lens rated for drive-over loads

Answer

Well lights in trafficked areas must have a flush-mount tempered or polycarbonate lens rated to handle the compressive load of lawn equipment.

(LLC) Landscape Lighting Certification Practice Test

(LLC) Landscape Lighting Certification Practice Test

LLC Installation Techniques 3