Zone 1 in bathroom electrical zoning is best described as 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: (B)

The main concept here is how bathroom electrical zonesdefine where water exposure is most likely and therefore what equipment and protection are allowed. Zone 1 is the area above the bath or shower, up to a certain height, and it also includes the space around a washbasin. This is the region where splashes are more likely, so it requires higher protection for installed equipment and wiring.

That’s why the description “top of shower, above a bath or around a sink” matches Zone 1 best. The other options describe different areas: inside the basin or bath is Zone 0, 0.6 m outside Zone 1 is Zone 2, and outside the bathroom isn’t Zone 1.