Lighting and Electrical Systems Flashcards
7 cards from real Certified Energy Auditor Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Lighting and Electrical Systems flashcards as text
What is the Color Rendering Index (CRI) minimum value recommended for office environments to maintain visual comfort?
Answer: CRI 80
A CRI of 80 or above is the standard recommendation for office environments to ensure accurate color perception and visual comfort.
Which ballast type provides the highest energy efficiency for fluorescent lamps?
Answer: Electronic ballast
Electronic ballasts operate at high frequency (20,000+ Hz), eliminating flicker and reducing energy losses compared to magnetic ballasts.
A building's power factor is 0.72. Which corrective measure would most directly improve this at the source?
Answer: Adding capacitor banks
Capacitor banks supply reactive power locally, reducing the reactive current drawn from the utility and improving the power factor.
What does the term 'lamp lumen depreciation' (LLD) refer to in lighting audits?
Answer: The reduction in light output as a lamp ages
LLD describes the predictable decline in lumens produced by a lamp over its rated life, which affects maintained illuminance calculations.
An energy auditor finds demand charges constitute 40% of the facility's electric bill. Which strategy directly reduces demand charges?
Answer: Implementing peak load shifting with lighting controls
Demand charges are based on peak 15- or 30-minute intervals; shifting or curtailing lighting loads during peak periods directly lowers the billed demand.
Which wiring configuration is required by NEC Article 410 for fixtures installed in a clothes closet?
Answer: Surface-mounted incandescent fixtures are prohibited
The NEC prohibits incandescent or fluorescent fixtures with open or partially enclosed lamps in clothes closets due to fire risk from proximity to stored items.
In a lighting power density (LPD) audit, which metric is used to compare a building's lighting system to ASHRAE 90.1 baselines?
Answer: Watts per square foot
ASHRAE 90.1 LPD limits are expressed in watts per square foot (W/ft²), making this the direct comparison metric in a lighting audit.