Domakihub Pool Bonding Wire: Keep Swimmers Safe from Electric Shock
Equipotential bonding is a non-negotiable safety requirement that most pool owners never hear about until something goes wrong.
Reviewed by Domakihub pool pros · 2026-06-23 · 5 min read
Every pool in Greece — whether at a private villa, a holiday rental, or a hotel — must meet equipotential bonding requirements under electrical safety codes, yet the bonding wire is one of the most frequently skipped or incorrectly installed elements of a pool build. The video above walks through the fundamentals of pool bonding and the electrical principles behind it; this article follows those fundamentals with the concrete steps you need to install the wire correctly. Getting this right is not a cosmetic detail: improper or missing bonding is a leading cause of electric shock drowning, a silent hazard that gives no visible warning.
What Is Equipotential Bonding and Why Does It Matter?
Equipotential bonding means connecting every metallic component in and around a pool — ladders, handrails, light niches, pump housings, heat exchangers, reinforcing steel in the shell — with a continuous copper conductor so they all sit at exactly the same electrical potential. When all metals share the same potential, there is no voltage difference between them, and therefore no driving force to push current through a person in the water.
This is fundamentally different from grounding, which carries fault current safely to earth. Bonding does not carry operating current at all; its sole job is to equalize potential. A pool can be perfectly grounded and still electrocute a swimmer if the bonding is absent, because the water itself can carry a voltage gradient between an unbonded metal fitting and the pool wall.
The Greek Regulatory Context
In Greece, electrical installations including pools fall under the ELOT HD 384 standard (harmonised with IEC 60364), which mandates supplementary equipotential bonding in wet locations. Hotel and short-term-rental properties inspected by the Greek Technical Chamber (TEE) or tourism authority are expected to demonstrate compliance, and insurance policies for commercial pool operators increasingly require documented bonding inspections.
For private homeowners the practical enforcement trigger is often a sale or refinancing, but the liability exposure in the event of an incident makes voluntary compliance the only sensible choice. Use a licensed electrician (elektrológos) to sign off the final installation; the steps below guide you through what the work involves so you can supervise it intelligently and ask the right questions.
How to Install Pool Bonding Wire: 5 Key Steps
- 1
Map every metallic component within 1.5 metres of the pool
Before buying a single metre of wire, walk the perimeter and list every metal element: pool shell reinforcement (rebar), skimmer bodies, return fittings, light niches, ladder anchor sockets, handrails, pump and filter housings, heat pump or heat exchanger casing, gas line stubs, and any metal deck furniture anchors. The bonding grid must reach all of them. In Greece, saltwater pools add sacrificial anodes and titanium cell housings to the list.
- 2
Select the correct conductor
Use solid bare copper wire with a minimum cross-section of 6 mm² (AWG 8 in American references you may encounter online). Bare wire is preferred over insulated because a future inspector can visually confirm the connection without disturbing the installation. Avoid aluminium and coated or tinned copper for this application; bare annealed copper provides the lowest contact resistance and resists the chlorine-laden atmosphere better than most alternatives.
- 3
Install a dedicated bonding lug on each component
Each metallic item needs a listed bonding lug or clamp that makes direct metal-to-metal contact — not through paint, grease, or plastic housings. For pump and filter equipment, consult the manufacturer's documentation to locate the bonding terminal (many modern pool pumps have a marked lug on the motor housing). For rebar in a concrete shell, wrap a bonding wire around one continuous bar and secure with an approved stainless clamp before the concrete pour, because you will not get a second chance.
- 4
Run a continuous loop and make all connections
Route the 6 mm² copper wire from component to component in a loop rather than a star, so that cutting or corroding one segment does not isolate downstream elements. Keep bends gentle; sharp kinks reduce effective cross-section. Bury any exposed runs in conduit where they cross pedestrian areas. At each lug, strip enough wire to make a clean bite under the clamp screw, tighten to the torque specified on the lug, and tug-test every connection before backfilling or tiling.
- 5
Test and document before the pool is filled
With a low-resistance ohmmeter (a standard multimeter works for a go/no-go check), measure resistance between any two bonded components. A correctly installed grid should show well under 1 ohm end-to-end; readings above 0.5 ohm on a short run warrant investigation. Photograph every lug location and the wire routing before concrete or tile covers them — this documentation is invaluable for future inspections, insurance claims, or when extending the pool equipment. Have your licensed electrician issue a written conformity declaration referencing ELOT HD 384.
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FAQ
- Is pool bonding the same as pool grounding?
- No — they serve different purposes. Grounding (earthing) provides a low-resistance path for fault current to flow safely to earth and trip a breaker. Bonding equalises the electrical potential between all metallic components so no voltage difference exists to drive current through a swimmer. A pool needs both: grounding protects equipment and triggers overcurrent protection; bonding protects people in and around the water.
- Does a fibreglass or vinyl-liner pool still need bonding wire?
- Yes. Even though the pool shell itself is non-conductive, the water is conductive and the metal fittings — lights, ladders, return jets, skimmers, pump and heater housings — are still present and must be bonded. The bonding wire runs between all those metal components regardless of shell material. In practice this is slightly easier than with a concrete shell because you are not racing the concrete pour, but the requirement is identical.
- How often should the bonding system be inspected?
- A visual and resistance check every two years is a reasonable interval for private pools. Commercial pools — hotels, holiday rentals — should be inspected annually by a licensed electrician as part of routine maintenance, and always after any electrical work, equipment replacement, or significant landscaping that could have disturbed buried conductors. Keep a dated inspection log on site.