LLC Blueprint Reading & Interpretation 3 — Questions and Answers
Question 1: On a low-voltage landscape lighting plan, what does the number '12/2' next to a wire run line indicate?
- 12-volt circuit with 2 fixtures
- 12 AWG wire with 2 conductors (Correct answer)
- 12-foot burial depth with 2-inch conduit
- 12-amp breaker on circuit 2
Correct answer: 12 AWG wire with 2 conductors
The notation '12/2' is standard wire labeling meaning 12-gauge American Wire Gauge (AWG) cable with 2 conductors.
Question 2: A blueprint legend shows a square symbol with diagonal hatching. In landscape lighting plans, this most likely represents:
- A step light or hardscape-mounted fixture (Correct answer)
- A transformer pad location
- A zone valve for irrigation
- An area of no-dig restriction
Correct answer: A step light or hardscape-mounted fixture
Hatched square symbols in lighting plans typically indicate recessed or surface-mounted hardscape fixtures such as step lights or deck lights.
Question 3: What does 'as-built' mean when stamped on a landscape lighting blueprint?
- The drawing was created before construction began
- The drawing reflects actual installed conditions after construction (Correct answer)
- The plan is a design proposal awaiting approval
- The blueprint uses as-built measurements from a survey
Correct answer: The drawing reflects actual installed conditions after construction
An as-built drawing is updated after installation to show the actual locations and configurations of installed equipment, including any field changes.
Question 4: On a landscape lighting site plan, contour lines that are close together indicate:
- A flat area ideal for path lighting
- Steep grade changes that may affect fixture aiming and cable routing (Correct answer)
- Underground utility conflicts
- Dense planting beds requiring uplights
Correct answer: Steep grade changes that may affect fixture aiming and cable routing
Closely spaced contour lines represent rapid elevation change (steep slopes), which affects fixture aiming angles and trench depth planning.
Question 5: A landscape lighting plan references 'Detail 3/E2.' How should this notation be interpreted?
- Detail number 3, found on sheet E2 (Correct answer)
- 3-inch conduit on electrical zone 2
- Third revision of the electrical plan, page 2
- Circuit 3 connecting to panel E, breaker 2
Correct answer: Detail number 3, found on sheet E2
The notation 'Detail 3/E2' is standard drawing cross-reference format meaning Detail #3 is located on sheet E2 of the drawing set.
Question 6: Which line type on a landscape lighting blueprint typically indicates an existing underground utility that must be avoided during trenching?
- Solid heavy line
- Long-dash short-dash line (phantom line) (Correct answer)
- Dotted line
- Wavy line
Correct answer: Long-dash short-dash line (phantom line)
Existing underground utilities are conventionally shown with a long-dash short-dash (phantom) line pattern to distinguish them from new work.
Question 7: On a landscape lighting plan, what does the acronym 'FOC' commonly stand for when noted along a wire run?
- Full Output Circuit
- Fiber Optic Conduit
- Face of Curb (Correct answer)
- Free of Charge installation zone
Correct answer: Face of Curb
FOC stands for 'Face of Curb' and is used as a measurement datum to locate fixtures or wire runs relative to the curb edge.
LLC Blueprint Reading & Interpretation 3
On a low-voltage landscape lighting plan, what does the number '12/2' next to a wire run line indicate?