SPECIALIST INSTALLATION

Decorative Fountain & Feature Pool Electrical: BS 7671 Section 702

Everything electricians need to know about electrical installations for decorative fountains, feature pools, and garden water features — BS 7671 Section 702 zone requirements, IP ratings, SELV in Zone 0, underwater luminaires, and supplementary bonding requirements.

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13 min readUpdated 2026-05-18Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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Key Takeaways

  • 1BS 7671:2018+A4:2026 Section 702 — Swimming Pools and Other Basins — applies to decorative fountains, feature pools, garden ponds with electrical equipment, and other water-containing basins in addition to swimming pools.
  • 2Section 702 defines three zones (Zone 0 inside the water, Zone 1 immediately above/around the water, Zone 2 further out) with progressively less restrictive requirements. All electrical equipment must be rated for the zone in which it is installed.
  • 3In Zone 0 (inside the water), only SELV (Separated Extra-Low Voltage) at a maximum of 12 V AC or 30 V DC is permitted. The SELV transformer must be located outside Zone 0 and Zone 1.
  • 4Underwater luminaires in Zone 0 must be specifically designed and approved for underwater use. They must comply with BS EN 60598-2-18 and carry an appropriate IP rating (minimum IP68 for continuously submerged equipment).
  • 5Supplementary equipotential bonding must connect all simultaneously accessible conductive parts — including fountain structure metalwork, water pipes, pump housings, and any other metalwork near the water — to prevent dangerous potential differences.
  • 6RCD protection with a rated residual operating current not exceeding 30 mA is required for all circuits supplying electrical equipment in or near water features, regardless of whether SELV is used for some circuits.
01 · Specialist Installation

BS 7671 Section 702: Swimming Pools and Other Basins

BS 7671:2018+A4:2026 Section 702 — Swimming Pools and Other Basins — is the authoritative technical standard for electrical installations in and around all types of water-containing basins in the UK, including decorative fountains, ornamental pools, garden ponds with electrical equipment, water walls, and similar features in addition to swimming pools.

  • Scope — Section 702 applies to basins of swimming pools, paddling pools, fountain basins, garden ponds with electrical equipment, and similar. It applies to all electrical equipment installed within the defined zones around these water features and to the circuits supplying that equipment. Compliance is required for both new installations and alterations to existing installations.
  • The electric shock hazard — water is a conductor of electricity. The human body in or near water presents a low-resistance path for fault currents. Even small fault currents can cause fatal electric shock when the body is immersed in or in contact with water. Section 702 applies strict requirements precisely because the consequences of an electrical fault in these locations are severe.
  • Part P notification — electrical work at decorative fountains, garden ponds with electrical equipment, and similar water features is notifiable under Part P of the Building Regulations in England. Installers must be registered with a competent person scheme or arrange building control inspection and certification.

Electricians working on water feature installations should hold a current BS 7671 qualification and be thoroughly familiar with Section 702. The IET Guidance Note 7 (Special Locations) provides detailed supplementary guidance.

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02 · Specialist Installation

Zone Requirements Under Section 702

Section 702 defines three zones around water basins — Zone 0, Zone 1, and Zone 2 — with progressively less restrictive requirements as distance from the water increases. The dimensions of each zone depend on the type of basin and are defined in the standard.

  • Zone 0 — inside the water — the interior of the water basin itself (the water volume). This is the highest risk zone. Only SELV equipment operating at a maximum of 12 V AC or 30 V DC is permitted. Equipment must be IP68 rated. No switching devices, socket outlets, or junction boxes are permitted in Zone 0.
  • Zone 1 — immediately around the water — extends 2 m horizontally from the edge of the basin and 2.5 m vertically above the floor level (for fountains and similar, the zone extends above the basin lip). SELV or PELV at a maximum of 12 V AC or 30 V DC is required. Equipment must be IP44 rated as a minimum. No switches, socket outlets, or junction boxes are permitted except special types approved for Zone 1.
  • Zone 2 — the outer zone — extends a further 1.5 m horizontally beyond Zone 1 (so 3.5 m total from the basin edge). Equipment in Zone 2 must be IP44 rated as a minimum and must be protected by a 30 mA RCD. Socket outlets are not permitted in Zone 2 (for swimming pools and paddling pools; the application to fountains depends on the specific installation).

For decorative fountains without a walkable surround — where members of the public cannot enter the water — the zone dimensions may be interpreted differently. The designer must assess the specific installation and apply the intent of Section 702 to the actual risk presented by the feature.

03 · Specialist Installation

IP Ratings for Water Feature Electrical Equipment

Ingress protection (IP) ratings are critical for all electrical equipment installed in or near water features. The rating must be appropriate to the zone and to the actual conditions of installation.

  • IP68 — Zone 0 (continuously submerged) — the highest standard for continuous submersion. Equipment rated IP68 is tested to remain watertight when submerged to a defined depth for a defined period. Underwater luminaires, submersible pumps, and any other equipment permanently submerged must be IP68.
  • IP55 — Zone 1 (splashing and spray) — protection against dust ingress and water jets from any direction. Required for equipment in Zone 1 that is not submerged but is subject to water splash from the fountain mechanism. IP44 is the stated minimum for Zone 1, but IP55 is strongly recommended.
  • IP44 — Zone 2 (splash risk) — protection against solid objects greater than 1 mm and water splashing from any direction. This is the minimum for Zone 2 equipment. In practice, equipment in Zone 2 of an outdoor water feature should exceed this minimum to account for UK weather conditions.
04 · Specialist Installation

SELV Requirements in Zone 0 and Zone 1

Separated Extra-Low Voltage (SELV) is the mandatory supply system for electrical equipment in Zone 0 of water features. SELV eliminates the risk of dangerous electric shock by limiting the available voltage to a level that cannot drive lethal currents through the body, even when immersed in water.

  • Voltage limits — SELV is limited to 12 V AC or 30 V DC under BS 7671. For aquatic environments (Section 702, Zone 0), the maximum voltage is 12 V AC. The safety isolating transformer supplying the SELV circuit must comply with BS EN 61558-2-6 and must be located outside Zone 0 and Zone 1 — typically at least 3.5 m from the water basin edge.
  • No earth connection — SELV circuits must not be earthed. The live conductors of a SELV circuit must be separated from earth and from all other circuits. If the SELV circuit were earthed, it would no longer be separated extra-low voltage and would lose its shock-protection characteristics.
  • SELV cable routing — cables of SELV circuits must be physically separated from, or have additional insulation from, cables of other circuits. SELV conductors must be identifiable and must not be confused with conductors of other circuits. In practice, SELV cables are routed in separate conduit or trunking.
05 · Specialist Installation

Underwater Luminaires for Fountains and Pools

Underwater luminaires are a distinctive and technically demanding component of decorative fountain and feature pool installations. They must be specifically designed and tested for continuous submersion and must comply with both the luminaire standard and BS 7671 Section 702.

  • BS EN 60598-2-18 — underwater luminaires must comply with BS EN 60598-2-18 (luminaires — particular requirements — luminaires for swimming pools and similar applications). This standard covers the design, construction, and testing of luminaires intended for submersion. Only luminaires bearing this certification should be used in Zone 0 of fountains and pools.
  • LED technology — modern underwater luminaires are predominantly LED-based, which offers advantages of lower heat generation (reducing thermal stress on seals), lower power consumption, and longer service life. LED luminaires are available in colour-changing variants for dramatic fountain effects. All LED drivers for Zone 0 luminaires must be located outside Zones 0 and 1.
  • Maintenance access — underwater luminaires must be accessible for inspection and relamping (where applicable) without draining the entire basin. Many designs incorporate a pull-out mechanism so the luminaire body can be withdrawn from its housing in the basin wall for maintenance. The housing itself remains watertight when the luminaire is removed.

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06 · Specialist Installation

Bonding Requirements for Water Features

Supplementary equipotential bonding is a mandatory requirement for all water feature installations. Its purpose is to ensure that no dangerous potential difference can exist between simultaneously accessible conductive parts in or around the water feature.

  • What must be bonded — Regulation 702.415.2 requires supplementary equipotential bonding of all simultaneously accessible extraneous conductive parts in Zones 0, 1, and 2. This includes: metallic fountain basin structure, water supply and drainage pipes (including flexible hoses with metallic fittings), pump motor casings, luminaire housings, metallic handrails or decorative features, and any other metallic components accessible from the water or its immediate surroundings.
  • Bonding conductor sizing — supplementary bonding conductors must be sized in accordance with BS 7671 Table 54.2. The minimum cross-sectional area of copper bonding conductors is 4 mm² where mechanically protected or 6 mm² where not mechanically protected. All bonding conductors must be identifiable (green and yellow sleeving) and must be connected to the main earthing terminal.
  • Testing bonding continuity — the continuity of all supplementary bonding conductors must be tested and recorded at installation and at each periodic inspection. Bonding connections are subject to corrosion in the wet environment and must be inspected for deterioration at each annual inspection.
07 · Specialist Installation

Garden Water Features and Pond Electrical Installations

Domestic garden water features — ornamental ponds, water walls, millstone fountains, and similar — are increasingly popular and present the same fundamental electrical hazards as commercial fountains. Section 702 applies equally to domestic garden water features with electrical equipment.

  • Submersible pumps — the pump is typically the most hazardous component in a garden water feature. Only pumps specifically designed and approved for submersible use (rated IP68) may be placed in the water. All pump circuits must be protected by a 30 mA RCD. The RCD must be at the consumer unit or in a weatherproof outdoor enclosure — not inside the house where it is remote from the pump location.
  • Pond lighting — submersible pond lights must be specifically designed for underwater use. Low-voltage (12 V AC or 30 V DC) pond lighting systems are the safest option and the only option permitted in Zone 0. The transformer supplying the low-voltage lighting must be located outside Zones 0 and 1, typically in a waterproof housing away from the pond edge.
  • Outdoor socket outlets — socket outlets used to supply garden water features must be weatherproof, RCD-protected, and installed in accordance with the outdoor electrical installation requirements. Plugs and cables must be rated for outdoor use. Extension leads used outdoors must be fully unwound to prevent overheating.

All garden pond and water feature electrical work in England is notifiable under Part P of the Building Regulations. Homeowners commissioning this work should verify that their electrician is registered with a competent person scheme such as NICEIC or NAPIT, and will provide an Electrical Installation Certificate upon completion.

08 · Specialist Installation

For Electricians: Water Feature and Fountain Electrical Work

Water feature and fountain electrical work is a specialist area with significant design and installation skill requirements. Electricians who master Section 702 can work on high-value commercial fountain installations in public spaces, hotels, and office developments, as well as domestic garden pond and water feature projects.

Certify Water Feature Installations

All new water feature electrical installations require an Electrical Installation Certificate (EIC). Use the Elec-Mate certificate app to complete the EIC on your phone — including the schedule of test results covering insulation resistance, continuity, RCD test results, and earth electrode resistance. Generate the PDF certificate on site.

Annual Inspection Contracts

Commercial fountain installations require annual periodic inspection. Use the quoting app to offer annual maintenance contracts to commercial property managers and facilities teams. Water feature maintenance contracts often include the electrical inspection as part of a broader maintenance package.

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Frequently Asked Questions About Fountain and Water Feature Electrical Installations

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