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Pond and water feature lighting.
Light on moving water is one of the best effects in a garden. Water and electricity also need more care than anything else outside.
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Why ponds are different
Ponds and fountains are a special location in the Wiring Regulations (BS 7671, Section 702), with zones in and around the water and strict rules on what can go in each. In practice that means:
- Lights in the water are usually extra-low voltage (12 volts) from a safety transformer kept out of the zones, and rated for permanent immersion (IPX8).
- Pumps and filters are on circuits with 30 mA RCD protection, and supplied the way the manufacturer specifies.
- Switches and sockets stay well away from the water, in weatherproof enclosures.
- Cables are armoured or ducted and buried, not run across the lawn.
- A new outdoor circuit is notifiable under Part P in England. We certify and notify it.
Effects that work
- A narrow beam into a waterfall or rill so the moving water sparkles.
- A soft light under the surface for depth, rather than a bright spot looking up at you.
- Light the planting around the pond and let the water reflect it.
Photographs: a private residence in Totteridge (a project led by our director Michael Simm and now maintained by SEGplc).
Questions we’re asked
Can I plug a pond pump into an outdoor socket?
Many pond pumps are made for it, as long as the socket is weatherproof, RCD protected and placed away from the water. We check the pump’s instructions.
Are 12 volt pond lights safe?
Extra-low voltage from a proper safety transformer is the safest option for lights in the water, and the usual choice.
My pond pump keeps tripping the RCD. Why?
Usually water in the pump, cable or a joint. Leave it off and have it checked. See RCD keeps tripping.
Written by SEGplc. Last updated 19 October 2026.
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