LLC Safety Procedures & PPE 2 — Questions and Answers
Question 1: Before excavating to bury low-voltage landscape lighting wire, what is the required first step in most US jurisdictions?
- Call 811 to request underground utility locating (Correct answer)
- Obtain a soil compaction test
- Apply for a landscape permit
- Notify the local fire department
Correct answer: Call 811 to request underground utility locating
811 is the national 'Call Before You Dig' number that triggers free utility marking to prevent striking buried lines.
Question 2: Which class of fire extinguisher is appropriate if a landscape lighting transformer ignites due to an electrical fault?
- Class A
- Class B
- Class C (Correct answer)
- Class D
Correct answer: Class C
Class C extinguishers are rated for energized electrical equipment fires and use non-conductive agents.
Question 3: A technician needs to splice low-voltage wire in a wet garden area. Which connector type best maintains waterproof integrity?
- Standard twist-on wire nut
- Self-sealing gel-filled IDC connector (Correct answer)
- Open crimp sleeve
- Electrical tape wrap only
Correct answer: Self-sealing gel-filled IDC connector
Gel-filled insulation displacement connectors seal out moisture and prevent corrosion at splice points in outdoor, wet locations.
Question 4: When working on a 120V landscape lighting circuit that feeds low-voltage transformers, the technician should treat exposed conductors as:
- Safe once breaker is off
- Energized until personally verified with a meter (Correct answer)
- Low-risk because transformers step down voltage
- Harmless if wearing rubber-soled shoes
Correct answer: Energized until personally verified with a meter
NFPA 70E requires electrically qualified workers to verify de-energization with a properly rated meter before treating conductors as safe.
Question 5: What is the OSHA-mandated minimum arc flash boundary calculation trigger voltage for landscape lighting control panels?
- 50 volts AC (Correct answer)
- 120 volts AC
- 240 volts AC
- 480 volts AC
Correct answer: 50 volts AC
OSHA 29 CFR 1910.333 requires shock-protection boundaries starting at 50 volts AC and above.
Question 6: A lighting crew is setting fixtures around a swimming pool. Which safety zone requires all 120V luminaires to be GFCI-protected within 20 feet of the water's edge?
- Zone 0
- Zone 1
- Zone 2 (Correct answer)
- Zone 3
Correct answer: Zone 2
NEC Article 680 defines Zone 2 (10–20 ft from pool edge) as requiring GFCI protection for all 120V receptacles and luminaires.
Question 7: Which PPE item is specifically required when using a rotary hammer drill to core through masonry near landscape lighting conduit runs?
- Chemical splash goggles only
- Safety glasses with side shields and hearing protection (Correct answer)
- Face shield alone
- Tinted safety glasses
Correct answer: Safety glasses with side shields and hearing protection
Rotary hammers generate flying debris requiring impact-rated eye protection and high noise levels requiring hearing protection rated to OSHA 29 CFR 1910.95.
LLC Safety Procedures & PPE 2
Before excavating to bury low-voltage landscape lighting wire, what is the required first step in most US jurisdictions?