In bathroom electrical zoning, Zone 0 refers to which area?

• A. In a bath, shower base or sink
• B. Top of shower, above a bath or around a sink
• C. 0.6m away from the shower, bath or sink
• D. Outside the bathroom

Answer: (A)

Zone design in bathrooms classifies areas by how much water exposure they have. The area inside the bath, shower base, or sink is Zone 0, where water can be present directly and the risk of electric shock is highest. Because of that, any electrical equipment located there must be safety-focused, typically using safety extra-low voltage (SELV) and appropriate protection.

The other descriptions refer to different zones: the area at the top of the shower or around the bath or sink is Zone 1, which has splash exposure but is a step away from the water-filled interior; a zone extending about 0.6 m beyond those boundaries is Zone 2; and outside the bathroom is not part of the bathroom zones at all. So the interior of the bath, shower base, or sink is the Zone 0 definition.