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How this is calculated#

The tool places a light, switch or socket‑outlet in a zone. It then reads the least IP rating and the RCD rule for that zone. It follows Section 6 of AS/NZS 3000:2018.

1. Situation. You pick the fitting: a bath, a shower, a basin, a spa, a pool or a sauna. Each one has its own table of zones.
2. Reference point. Each situation measures from its own point. A bath measures from the internal rim. A shower measures from the fixed plumbing connection or the rose.
3. Zone limits. The tool lists Zone 1, Zone 2 and Zone 3 (Cl 6.2.2.1). Each has a distance out and a height up.
4. Device position. You enter the horizontal distance and the height of the device. The tool finds the first zone that holds that point.
5. IP rating. The zone sets the least IP rating (Cl 6.2.4). The tool compares your rating with it.
6. RCD and position. The tool adds the RCD rule for a home (Cl 2.6.3.3.1). It also gives the lowest height for a socket‑outlet or switch.

Worked example#

Each link opens the tool with its inputs.

• Luminaire at an open shower. The luminaire sits 0.3 m from the plumbing connection and 1.8 m up. It has an IPX2 rating. The tool puts it in Zone 1 and asks for IPX4 at least. The check fails on the IP rating.

Limits#

• The tool does not model a barrier that shrinks a zone. Walls, doors, floors and ceilings also limit the zones. Check the room.
• A shower over a bath adds a radius from the shower connection. You must type that distance.
• Equipment behind a fixed IPX4 panel that needs a tool to open is not in a zone. The tool does not decide this for you.
• A recessed fitting with all live parts above the ceiling is outside the zones below it.
• Protection by obstacles or by placing out of reach is not allowed in these zones.
• The tool points at the clause. It is not a ruling on a design.

See also: Wire a bathroom: zones, IP and the RCD, Damp situations and the Section 6 zones and RCD selection.