Water and electricity don't mix, and the bathroom is the one room where that rule plays out every day — steam from the shower, splashes around the sink, damp air after laundry. That's why bathroom wiring is held to a stricter standard than the rest of the apartment, and some of those requirements aren't about looks — they're about making sure nobody gets shocked.
Here's what to look out for whether you're wiring a bathroom from scratch or just want to know if your current setup is safe.
Moisture Zones: Why You Can't Put a Socket Anywhere in a Bathroom
A bathroom is loosely divided into zones with different levels of risk — closer to the water source (bath, shower, sink), the risk is higher; further away, it drops. That's why sockets, switches, and fixtures get chosen and positioned differently depending on where they sit: something fine above a sink might be wrong inside a shower enclosure, and vice versa.
In practice, that means a hairdryer socket near the mirror should sit clear of the sink and any splash zone, and there should be no electrical points at all inside the shower or bath itself. It's worth working out the exact zoning with an electrician at the planning stage of a renovation — there's no reliable "eyeball it" layout here.
An RCD in the Bathroom Isn't Optional
A residual current device (RCD) detects even a small current leak — say, if someone with wet hands touches a damaged wire or an appliance's casing — and cuts the power in a fraction of a second, before enough current can pass through the body to be dangerous. Skipping one is risky in any dry room, but in a bathroom, where damp skin lowers body resistance and current passes through more easily, an RCD isn't a nice-to-have — it's required.
A washing machine in a bathroom or a combined bathroom-laundry space, along with every socket in that room, should be RCD-protected as a baseline.
Moisture Protection Class for Fixtures and Sockets
Light fixtures and sockets rated for wet rooms carry a protection class against water and dust, marked on the packaging or the fixture itself, that indicates how well it holds up against splashes, jets of water, or direct water ingress. The closer a fixture sits to the water source, the higher that protection rating needs to be.
We're deliberately not quoting exact rating codes here — they vary by manufacturer and model — so the safer approach when choosing a fixture or socket for a bathroom is to look for a clear "suitable for wet rooms" label and confirm the exact protection level for your specific zone with the seller or an electrician, rather than judging by the fixture's general appearance.
| Zone | Risk level | What's typically required |
|---|---|---|
| Inside the bath/shower | Highest — direct water contact | No electrical points at all; fixtures only if rated for the highest moisture protection |
| Near the sink, by the mirror | Medium — splashes, steam | Moisture-rated sockets and fixtures, RCD required |
| Far side of the room, near the door | Lower — minimal moisture | Simpler-rated sockets are acceptable, but RCD is still required |
Earthing and Equipotential Bonding
Bathroom safety isn't only about the RCD — metal fixtures like pipes, a heated towel rail, or a metal bath tub also need to be bonded together and to the earth. This is called equipotential bonding: if voltage somehow appears on one metal object, there's no potential difference between the surfaces, so touching two of them at once isn't dangerous.
This part of the work is barely visible once finished — the bonding conductors are usually hidden — which is exactly why it gets skipped so often in a "cosmetic" renovation that swaps out tile and fixtures but leaves the electrics untouched.
Why Bathroom Electrics Aren't a DIY Project
High moisture combined with the fact that people are often barefoot and wet-handed in a bathroom makes it the worst room in the house to wire by guesswork. What matters here often isn't visible once the renovation is done: whether the zones were laid out correctly, whether that circuit has an RCD, whether a fixture is actually rated for the moisture level at that specific spot, whether bonding is in place.
An ELECTRIC ASTANA electrician can design bathroom electrics from scratch, or inspect existing wiring and point out weak spots if you just want peace of mind.