Which zone includes the area inside a bath, shower base, or sink?

• A. Zone 1
• B. Zone 0
• C. Zone 2
• D. Zone 3

Answer: (B)

The thing being tested is how zones around a bath, shower, or sink are defined to reflect water exposure and electrical safety. The area inside the bath, the shower base, or the sink basin is Zone 0 because water is directly present there, creating the highest risk of electric shock. In this innermost zone, electrical equipment must be designed for direct water exposure (typically low-voltage SELV or double-insulated gear and appropriate protection). As you move outward, Zone 1 covers the space above the bath or shower up to a certain height, Zone 2 extends further out with less risk, and Zone 3 is outside these zones with the least stringent protections. So the area inside the bath, shower base, or sink is Zone 0.