Bathroom zones: which light fittings are allowed where

A bathroom is divided into zones, each with different protection requirements for light fittings. Zone 0, 1 and 2 boundaries, IP codes and installation tips.

A bathroom brings together water, steam and metal plumbing, and the people in it are often wet and barefoot. Wet skin lowers the body's electrical resistance, so a current that might go unnoticed in dry conditions can be dangerous here. That is why bathrooms get special treatment in electrical safety: the room is divided into zones according to distance from water, and each zone sets different requirements for the equipment installed in it. Internationally, this approach is based on IEC 60364-7-701; many countries' national wiring rules build on it, although the details can differ.

How the zones are defined

The description below shows the general principle. Exact dimensions can vary with the edition of the standard and with local regulations.

• Zone 0: the interior of the bath or shower tray, where water actually collects.
• Zone 1: the space above zone 0, following the edge of the bath or shower tray, up to about 2.25 m above the floor. For a shower without a tray, the zone is defined by a radius around the water outlet.
• Zone 2: a band about 0.6 m wide extending horizontally beyond zone 1, up to the same height.
• Outside the zones: the rest of the room, including the ceiling area above zones 1 and 2.

A fixed partition, glass shower screen or wall projection can change a zone boundary because it limits splashing. Assessing that on site is the electrician's job.

IP codes: what the digits mean

A fitting's protection rating is written as the letters IP followed by two digits. The first digit describes protection against solid objects and dust, the second against water. An "X" in place of a digit means that aspect has not been rated.

For bathrooms, the second digit is what matters most:

• IPX4: protection against water splashed from any direction;
• IPX5: protection against water jets from any direction;
• IPX7: protection against temporary immersion to a specified depth and duration.

For example, an IP44 fitting is protected against solid particles larger than 1 mm and against splashing water, while IP65 means fully dust-tight and protected against water jets. A higher number means more protection, but it does not mean a fitting can go in any zone; the manufacturer's instructions must be followed too.

Typical requirements by zone

Based on the standard and national rules, the usual approach is:

• Zone 0: only equipment specifically intended for this zone, operating at safety extra-low voltage (SELV), with its power source located outside the zones. The typical requirement is IPX7. Ordinary ceiling or wall fittings do not go here.
• Zone 1: at least IPX4, or IPX5 where water jets are used for cleaning. Only fixed fittings that the manufacturer states are suitable for these conditions are installed.
• Zone 2: typically at least IPX4.
• Outside the zones: there may be no specific IP requirement, but in a steamy bathroom an IP44 fitting is a practical choice.

In addition, a key requirement of the standard is that bathroom circuits are protected by a residual current device (RCD) with a rated sensitivity not exceeding 30 mA. Switches and sockets have their own zone-based restrictions as well.

It is the fitting, not the lamp, that is protected

An IP rating applies to the complete fitting: the body, sealing ring, glass and cable entry together keep water out. Believing that an ordinary bulb is "moisture-resistant" does not make a fitting with an open lampholder suitable for a bathroom. Likewise, if the sealing ring or cover glass of an IP44 downlight is not put back after changing the lamp, the protection is lost.

Moisture can also collect behind suspended and stretch ceilings. When planning where drivers, transformers and junction boxes will sit in that space, dampness has to be taken into account.

Checklist before installation

• Does the fitting's box or label state its IP rating and suitability for bathrooms?
• Which zone does the fitting's position fall into? Measure from the actual edge of the bath or shower.
• Is the circuit protected by an RCD?
• In a low-voltage system, is the transformer or driver outside the zones?
• Are cable entries sealed, and does the fitting's cover close fully?
• Is the work being done by a qualified electrician in line with local regulations?

Lamps with GU10 and G5.3 caps are widely used in downlights with the right protection rating. Zaferoğlu Elektrik also makes Zəfər İşığı LED lamps with these caps, but the lamp itself never replaces the moisture protection of the fitting.