NCIDQ IDPX Practice Exam 2025 – Complete Interior Design Test Prep

Question: 1 / 400

What is the operating voltage for low voltage lamps?

120V

24V

12V

The operating voltage for low voltage lamps is typically 12V. Low voltage lighting systems are commonly used in various applications, including landscape lighting, under-cabinet lighting, and track lighting. The advantage of using low voltage lamps includes increased energy efficiency, reduced heat output, and enhanced safety, as they operate at a lower voltage that minimizes the risk of electrical shock and related hazards.

Low voltage lamps often require a transformer to convert standard line voltage (commonly 120V in households) to the lower voltage needed, allowing the fixtures to function correctly. While 24V systems also exist and are used in some specific applications, 12V is the more widely recognized and standard operating voltage for most low voltage lamp installations. The higher voltages of 120V and 240V are typically used for standard household or commercial lighting, which is not classified as low voltage.

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240V

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