Landscape Lighting Safety & Code Compliance Flashcards

A landscape lighting circuit repeatedly trips its GFCI at startup but clears when fixtures cool down. What is the most likely cause?

Answer: Current leakage from moisture in fixture sockets

Thermal cycling causes condensation inside fixtures, and moisture leakage to ground can trip GFCIs particularly at cold startup before moisture evaporates.

Under the NEC, which type of raceway is NOT permitted for direct burial in landscape lighting installations without additional protection?

Answer: Electrical metallic tubing (EMT)

EMT is not listed for direct burial in soil; it requires protection and is not suitable for underground landscape use unlike RMC or PVC.

A client wants landscape up-lights installed directly in a fountain. What NEC provision applies?

Answer: Article 680 submersible luminaire requirements

Luminaires installed in fountains must comply with NEC Article 680 requirements for submersible underwater fixtures regardless of voltage.

What is the significance of a transformer having a Class 2 output rating in a landscape lighting system?

Answer: It limits output power to reduce shock and fire hazard, simplifying wiring requirements

Class 2 power sources are inherently limited in current and voltage, which reduces shock and fire hazard and allows simplified wiring methods under NEC Article 725.

An OSHA inspection of a landscape lighting installation job site finds workers using a 120V power tool without GFCI protection. The applicable OSHA standard requires GFCI on all 120V, 15–20A construction-site receptacles. What is the employer's first corrective action?

Answer: Immediately provide GFCI protection before work resumes

OSHA 29 CFR 1926.404 requires immediate abatement of GFCI violations before employees continue using unprotected circuits.

A landscape lighting installer encounters aluminum wiring in an existing residential panel. When connecting a new outdoor circuit breaker, what is the critical safety step?

Answer: Use an AL-CU rated breaker and apply anti-oxidant compound

Aluminum wiring requires AL-CU rated devices and anti-oxidant compound at terminations to prevent oxidation and overheating at connection points.

Which of the following actions is required before energizing a newly completed landscape lighting system for final inspection?

Answer: Confirming all fixtures are Listed for their installed location type

Verifying that all fixtures carry the correct Listing (wet, damp, or dry) for their actual installed environment is a fundamental compliance check before energizing.