CLD Electrical Systems & Lighting Control 2

Question 1

A 0–10V dimming system receives a control signal of 5V. What approximate output level should the driver produce?

Accepted Answer

50% output

Answer

In a 0–10V system, 5V corresponds to approximately 50% light output on a linear scale.

Question 2

Which wiring method is required by NEC for circuits serving luminaires in a swimming pool wet niche?

Accepted Answer

Type MC cable or rigid conduit

Answer

NEC Article 680 requires luminaires in wet niches to be wired with approved conduit or Type MC cable rated for wet locations.

Question 3

What is the primary advantage of using a centralized lighting control system over distributed zone dimmers?

Accepted Answer

Single-point programming and system-wide scene coordination

Answer

Centralized systems allow all zones to be programmed, scheduled, and coordinated from one processor, enabling complex scenes impossible with standalone dimmers.

Question 4

A designer specifies a 277V LED driver. On which distribution system is this voltage commonly found?

Accepted Answer

277/480V three-phase wye

Answer

277V is the phase-to-neutral voltage of a 277/480V three-phase wye system, common in commercial buildings.

Question 5

DALI (Digital Addressable Lighting Interface) supports up to how many individually addressable devices on a single bus segment?

Accepted Answer

64

Answer

The DALI standard (IEC 62386) allows up to 64 individual device addresses per bus segment.

(CLD) Certified Lighting Designer Practice Test

(CLD) Certified Lighting Designer Practice Test

CLD Electrical Systems & Lighting Control 2