Guide · Updated October 2026
Bathroom electrical zones explained
Water and electricity are a dangerous mix, so the Wiring Regulations divide bathrooms into zones with strict rules for each.
The zones
| Zone | Where | What is allowed |
|---|---|---|
| 0 | Inside the bath or shower tray | Only SELV equipment rated at least IPX7 |
| 1 | Above the bath or shower up to 2.25 m | Fixed equipment suitable for the zone, at least IPX4, such as an electric shower |
| 2 | 0.6 m beyond zone 1 | Equipment rated at least IPX4, shaver sockets to BS EN 61558-2-5 |
Socket outlets
Standard sockets must be at least 3 m horizontally from the edge of zone 1. A socket inside a zone is one of the most common bathroom findings on an EICR, often coded C2, or C1 if parts are exposed.
RCD protection
All circuits in a room containing a bath or shower need 30 mA RCD protection. See RCD protection explained.
FAQ
Questions
Can I have a normal light fitting in the bathroom?
Outside the zones, yes. Inside zone 1 or 2 the fitting must have a suitable IP rating, usually IPX4 or higher.
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