Purpose

Classify bathroom zones from actual bath or shower geometry and select equipment by zone, voltage, IP rating, and manufacturer suitability.

Learning objectives

• Locate zones 0, 1, and 2
• Measure from zone boundaries
• Match equipment to external influences
• Avoid using a memorised sketch as site evidence

Bathroom zones describe heightened shock exposure around baths and showers. The actual room geometry, fixed partitions, accessibility, and current rules determine each boundary.

Core theory

Zone 0 is the bath or shower basin interior; zone 1 and zone 2 extend from defined boundaries and heights in the current Section 701 diagrams. Spaces and unusual shower arrangements require the exact definitions.

Equipment selection combines permitted equipment type, supply/protective measure, IP rating, RCD protection, isolation, and manufacturer environmental limits.

Current Amendment 4 material records ordinary LV socket-outlets only when at least 2.5 m horizontally from the boundary of zone 1; older 3 m statements must not be reused without checking the current edition.

Assumptions: No product data supplied.

1. Classify: Establish the precise zone from current diagrams and site geometry.
2. Select: Check allowed equipment, IP rating, supply/protection, and manufacturer instructions.
3. Verify: Confirm RCD, bonding decision, isolation, and installation environment.

No; voltage alone cannot establish zone suitability.

Reasonableness check: Water exposure and touch conditions require multiple coordinated protective measures.

Knowledge check

Answer: No. Equipment type, voltage/protective measure, RCD, location, and manufacturer suitability also matter.

Practical exercise

Use the current standard's diagrams to mark zones on three fictional room plans, noting every missing dimension.

Summary

• Zones follow actual geometry
• Selection uses more than IP
• Current Section 701 evidence is essential