Lighting in Bathrooms

For electrical fittings the bathroom is divided into zones into by the NZ Electrical Code of Practice as below:

This video from Eurotech Lighting gives an excellent view of NZ Lighting Regulations in a bathroom

zone-bathZones about a bath

zone-closed-showerZones  Enclosed Shower

zone-open-showerZones open shower

IP Ratings for Light Fittings
Zone 0 Zone 1 Zone 2  Zone 3
IP X7 AND Safety ELV supply IP X4  Sealed Light fitting IP X4  Sealed Light fitting No IP Rating required
The X in the IP rating refers to the ability to resist dust and solid particles entering the light fitting.   This number is not specified but it should be at least 4.