Swimming pool electrical installations are governed by BS 7671 Section 702. This guide covers zones 0, 1 and 2, SELV lighting, supplementary bonding, RCD protection types, filtration and heat pump circuits, and typical installation costs.
Free for 7 days · No charge until day 8 · Cancel anytime · Used by 1,000+ UK electricians
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.
1,000+
UK electricians
“Replaced three separate apps with Elec-Mate. Certs, quotes, and scheduling all in one place.”
Daniel Palmer — DP Electrical
Swimming pool electrical installations are one of the highest-risk environments in domestic and commercial electrical work. Water, wet surfaces, and the body's reduced electrical resistance when wet create the potential for fatal shock at voltages that would be survivable in dry conditions. BS 7671 Section 702 provides specific requirements that go well beyond the standard domestic installation requirements.
Section 702 applies to: swimming pools, paddling pools, ornamental garden pools, garden water features, spa pools and whirlpools, and indoor pools. The requirements are consistent whether the pool is domestic or commercial, though the application of specific rules (particularly Zone 2 socket requirements) varies.
Electricians working on swimming pool installations must be familiar with Section 702 and the zone definitions before undertaking any design or installation work. This guide covers the key requirements including zones, SELV, supplementary bonding, RCD protection, and the filtration and heating circuits that make up the bulk of the electrical package.
Every key change in the 2026 amendment on one page. AFDDs, TN-C-S protection, new schedule columns, model forms. Pinned on your van dash.
Section 702 defines three zones around a swimming pool, each with specific requirements for electrical equipment:
Inside the pool itself — the water volume. Only SELV equipment at maximum 12V AC or 30V DC. IPX8 protection mandatory. No standard mains voltage equipment permitted. Underwater luminaires and submersible pumps must be specifically rated for Zone 0.
Within 2m horizontally from the pool edge, or 2.5m vertically above the pool floor. Permitted: SELV equipment, Class II 230V equipment with IPX4 (or IPX5 where jets are used). No standard 230V socket outlets. Filtration pumps in Zone 1 must be Class II or SELV.
Between 2m and 3.5m from the pool edge (1.5m beyond Zone 1), or within 2.5m vertically above Zone 1. Standard 230V equipment with IPX4 protection is permitted. Socket outlets may be installed (with 30mA RCD) but should be avoided. AFDD recommended for circuits in this zone.
For an outdoor pool with a plant room beyond 3.5m from the pool edge, the plant room is outside all zones and can house standard mains voltage equipment without the Section 702 IP requirements. This is the preferred location for filtration pumps, heat pumps, and electrical distribution equipment.
Safety Extra Low Voltage (SELV) is mandatory for all luminaires in Zone 0 and Zone 1. SELV operates at maximum 12V AC (RMS) or 30V DC, which is below the threshold at which a shock current through wet skin becomes dangerous in most circumstances.
Supplementary equipotential bonding is one of the most critical elements of a pool electrical installation. Its purpose is to reduce the potential difference between all conductive parts in and around the pool to a safe level, even in the event of a fault.
Supplementary bonding must be installed during construction, before the pool shell is rendered or tiled. Access to the rebar bonding connection point must be maintained. Coordinate with the pool builder before the shell is complete.
All circuits supplying equipment associated with the pool (in any zone) must have 30mA RCD protection. The type of RCD matters:
16 certificate types, 70+ calculators, RAMS, quoting, invoicing, AI agents, and 46+ training courses — from £6.99/mo.
Start free trial
The filtration pump and heat pump are the highest-current loads in a pool electrical installation. Circuit sizing depends on the pool volume and equipment specification.
Where the plant room is more than 10m from the house consumer unit, consider installing a dedicated pool sub-board in the plant room. This simplifies discrimination, reduces voltage drop on individual circuit cables, and makes the pool system independently isolatable for maintenance and winterisation.
Indicative costs for a domestic outdoor swimming pool electrical installation:
Use Elec-Mate's quoting app to itemise pool electrical packages: SELV lighting, filtration circuits, bonding, heat pump supply…
Try it free for 7 daysSwimming pool electrical installations are specialist work commanding higher rates than standard domestic work. The key differentiators are knowledge of Section 702 and the ability to design and install a compliant, fully documented installation. Points to note:
Supplementary bonding connections to pool rebar and conduit sleeves for SELV cabling must be installed before the pool shell is rendered. Coordinate with the pool builder at the design stage — not after the concrete is poured.
The Electrical Installation Certificate must reference Section 702 compliance. Note the zone boundaries, SELV transformer details, bonding connections made, and the RCD type on the relevant circuits. A thorough EIC demonstrates competence and is essential for a specialist installation.
Elec-Mate's EIC Certificate app handles specialist installations including Section 702 pools.
Try it free for 7 daysVerified reviews from the UK App Store.
Elec-Mate is my go to app for business and electrical work. It's feature rich without feeling cluttered. A true all in one app for quotes, certs, calculations, RAMS, EICRs, and more. I use it every day without fail, and it makes my workflow much smoother since I'm not jumping between apps anymore. The price-to-feature ratio is excellent. Any issues I've had, the developer responds within the hour and usually fixes them the same day. 100% recommend.
I've used the app and the web based version for a while now and it's well worth the investment. If you're an apprentice or experienced Spark give it a go, you won't be disappointed.
I've been using Elec-Mate for a while now, and honestly, it's one of the best apps I've ever downloaded. Every aspect of it feels thoughtfully designed, from the clean and intuitive interface to the powerful features that make everything so easy to manage. It's clear that a lot of care and attention went into building this app, and it shows in every detail.
Real feedback from real sparks
“Replaced three separate apps with Elec-Mate. Certs, quotes, and scheduling all in one place.”
Daniel Palmer
Sole Trader · DP Electrical
“I've won two contracts this month because I could turn quotes around same-day with the AI cost engineer.”
Nathan Perry
Electrician · NP Electrical Services
“The study centre got me through my AM2. Mock exams and flashcards are brilliant.”
Jake Pizey
3rd Year Apprentice · Apprentice
Elec-Mate gives UK electricians the tools to price, install, and certify specialist pool electrical work including Section 702 compliance documentation. 7-day free trial.
“Replaced three separate apps with Elec-Mate. Certs, quotes, and scheduling all in one place.”
Daniel Palmer, DP Electrical
From £6.99/mo after trial — less than a coffee a week
We use cookies to improve the app and measure what works. Cookie Policy