LLC Material Selection & Properties 3

Question 1

Which type of finish on brass fixtures provides the longest lifespan when exposed to acidic soil conditions?

Accepted Answer

Powder coat

Answer

Powder coating creates a thick, durable barrier that protects brass from acidic soil, outlasting lacquer and natural patina finishes.

Question 2

When comparing cast aluminum to die-cast zinc for fixture housings, which property favors cast aluminum in outdoor applications?

Accepted Answer

Superior corrosion resistance

Answer

Cast aluminum forms a natural oxide layer that resists corrosion without additional coatings, while zinc is more susceptible to corrosive environments.

Question 3

Which wire insulation type is listed for direct burial without conduit in landscape lighting per NEC requirements?

Accepted Answer

UF-B

Answer

UF-B (Underground Feeder) cable is specifically designed and listed for direct burial applications without requiring conduit protection.

Question 4

What property of copper makes it the preferred conductor material over aluminum for low-voltage landscape lighting connections?

Accepted Answer

Lower resistance per unit length

Answer

Copper has lower electrical resistance per unit length than aluminum, reducing voltage drop over long runs common in landscape lighting systems.

Question 5

For fixtures mounted on wood structures, which mounting material should be avoided due to accelerated corrosion from tannins?

Accepted Answer

Carbon steel fasteners

Answer

Carbon steel fasteners corrode rapidly when exposed to tannins found in cedar and redwood, causing staining and structural failure.

(LLC) Landscape Lighting Certification Practice Test

(LLC) Landscape Lighting Certification Practice Test

LLC Material Selection & Properties 3