Bathroom Electrical Safety: What’s Allowed and What Isn’t

The bathroom is the most tightly regulated space in the home when it comes to electrical work — and for very good reason. Water and electricity together are potentially fatal, and Australian Standards set out detailed requirements for what can be installed where. Here’s what every North Shore homeowner needs to know.

The Zone System

Australian Standard AS 3000 divides the bathroom into zones based on proximity to water sources (bath, shower, basin). Each zone has different requirements:

• Zone 0: Inside the bath or shower basin. No electrical fittings permitted at all.
• Zone 1: Directly above the bath or shower, up to 2.25m high. Only SELV (Safety Extra Low Voltage) equipment rated IPX4 or higher is permitted — such as specifically rated shower lighting.
• Zone 2: Within 600mm horizontally of Zone 1. Fittings must be at least IP44-rated (splash-proof).
• Outside zones: Standard wiring rules apply, but RCD protection is required for all power circuits.

Power Points in the Bathroom

Standard power points (GPOs) must be located at least 1.25 metres from the edge of the bath or shower. All bathroom power circuits must have RCD (safety switch) protection. Shaver outlets — the special double-insulated, transformer-isolated outlets you see in hotel bathrooms — are an exception and can be placed within the 1.25m zone if they comply with AS 3820.

Exhaust Fans

Exhaust fans must be appropriate for the zone in which they’re installed. Most standard ceiling exhaust fans are rated for Zone 2 or outside zone installation only. Combined heat lamp and exhaust fan units are popular in Australian bathrooms but must be installed by a licensed electrician and must not be placed in Zone 1.

Heated Towel Rails

Electric heated towel rails are permitted but must be hardwired (not plug-in) when installed in the bathroom. The connection point and supply must be outside Zone 1, and the installation must be done by a licensed electrician.

Common Illegal Installations to Watch For

Extension cords in bathrooms are illegal and extremely dangerous. Standard power points placed less than 1.25m from the shower or bath are non-compliant. If you’re buying an older North Shore property, it’s worth having the bathroom electrical checked as part of your pre-purchase inspection.

Leenderts Electrical handles bathroom electrical installations and inspections across Sydney’s North Shore. Call 0407 743 963.