CBD CBD Lighting Design & Electrical Planning

Question 1

What is the primary purpose of task lighting in a bathroom design?

Accepted Answer

To provide focused light for specific activities like grooming

Answer

Task lighting provides directed illumination for specific activities such as applying makeup or shaving at the vanity.

Question 2

Which color temperature (in Kelvin) is most recommended for bathroom vanity lighting to provide true color rendering for grooming tasks?

Accepted Answer

3000K–3500K (neutral white)

Answer

A neutral white range of 3000K–3500K closely mimics natural daylight and provides accurate color rendering for grooming.

Question 3

In bathroom electrical planning, what is the minimum distance a GFCI-protected outlet must be from a bathtub or shower per the NEC?

Accepted Answer

3 feet

Answer

The NEC requires GFCI-protected outlets to be at least 3 feet from the edge of a bathtub or shower basin.

Question 4

Which type of lighting fixture is best positioned at eye level on either side of a bathroom mirror to minimize facial shadows?

Accepted Answer

Vertical side-mount sconces

Answer

Vertical sconces placed at eye level on both sides of the mirror eliminate the harsh shadows created by top-only lighting.

Question 5

What does the IP (Ingress Protection) rating indicate on a bathroom light fixture?

Accepted Answer

The level of protection against moisture and dust intrusion

Answer

The IP rating classifies a fixture's degree of protection against solid objects (dust) and liquids (moisture).

(CBD) Certified Bathroom Designer Practice Test