CBD CBD Lighting Design & Electrical Planning 2

Question 1

Under the NEC, which bathroom circuit requirement applies to the general-purpose receptacle outlets?

Accepted Answer

They must be on a dedicated 20-amp GFCI circuit

Answer

They may share a circuit with lighting

Answer

They require a 30-amp circuit

Answer

No special circuit is required

Question 2

What is the recommended lumen output range for general ambient lighting in an average-sized residential bathroom (approximately 50 sq ft)?

Accepted Answer

750–1,000 lumens

Answer

500–700 lumens

Answer

4,000–5,000 lumens

Answer

2,000–2,500 lumens

Question 3

Which bathroom zone classification (per IEC standards commonly referenced in design) designates the interior of the shower or tub enclosure?

Accepted Answer

Zone 0

Answer

Zone 1

Answer

Zone 2

Answer

Zone 3

Question 4

What type of dimmer switch is required when installing dimmable LED fixtures in a bathroom?

Accepted Answer

A dimmer rated and compatible with the specific LED driver technology

Answer

Standard incandescent-compatible trailing-edge dimmer

Answer

Any 0–10V commercial dimmer

Answer

A simple rheostat dimmer

Question 5

In a bathroom remodel, why is it important to verify the existing electrical panel capacity before adding new circuits?

Accepted Answer

To ensure the panel can handle increased amperage load without tripping or hazards

Answer

To comply with aesthetic design standards

Answer

To satisfy manufacturer warranty requirements only

Answer

Panel capacity is irrelevant for bathroom additions

Question 6

Which wire gauge is required for a 20-amp bathroom circuit per NEC standards?

Accepted Answer

12 AWG

Answer

16 AWG

Answer

14 AWG

Answer

10 AWG