Domakihub How to Install an Earthing Rod (and When to Call an Electrician)
Understand the process, materials, and safety rules before any earthing work begins.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
A proper earthing rod is one of the quietest but most critical safety components in any building's electrical system — it gives fault current a direct path to ground before it can harm anyone. The video above walks through the full installation procedure on site; this article adds the reasoning behind each step and covers what Greek homes, holiday rentals, and hotels need to get right. Because earthing work connects directly to your main electrical installation, it must always be carried out — and signed off — by a licensed electrician (in Greece, a certified electrical contractor holding a valid licence under YPAN regulations).
What an Earthing Rod Does and Why It Matters
An earthing rod (also called a ground rod or earth electrode) is a copper-clad steel spike driven into the soil outside a building. It creates a low-resistance path between your electrical installation and the earth, so that if a live conductor touches a metal casing — a washing machine frame, a boiler cabinet, a pool pump — the resulting fault current flows safely to ground rather than through a person.
In Greece most rural properties, island homes, and older buildings operate on a TT earthing system, meaning the protective earth comes entirely from a local electrode rather than the supply network. This makes the earthing rod the sole safety backstop for the whole property — getting it right is not optional.
Materials and Tools Used by the Electrician
A standard installation uses a copper-clad steel rod (14 mm diameter, typically 1.5 m or 2 m long with threaded couplings so sections can be joined to reach greater depth), an earth rod clamp rated for the conductor size, a 16 mm² or 25 mm² green-yellow insulated copper conductor, a driving cap to protect the rod head during installation, and a post-driver or SDS rotary-hammer with a ground-rod driving bit.
The electrician will also bring a loop-impedance or earth-resistance tester (e.g. a 3-pole Megger instrument) to measure the achieved earth resistance after installation. Greek standards align broadly with IEC 60364; the target resistance for a TT system is generally ≤ 200 Ω, though in practice the lower the better — under 10 Ω is the professional benchmark for safety.
Soil Conditions in Greece: What Changes the Work
Rocky terrain, sandy coastal soil, and the dry clay common across much of Greece all drive higher resistivity than damp northern-European soils. This often means the rod must be driven deeper, or two rods must be installed in parallel (spaced at least twice the rod length apart) to achieve an acceptable resistance value. On island properties and Peloponnese hillsides it is not unusual to need 3 m of combined depth or a ring electrode buried horizontally around the building perimeter.
This is why a pre-job soil assessment and a post-job resistance test are non-negotiable — the resistance measurement tells you whether the installation actually works, not just whether it looks correct.
How the Installation Proceeds (Step by Step)
- 1
Select the location and prepare the ground
The electrician chooses a spot within 1–2 m of the main distribution board — closer is better because it keeps the earth conductor short and reduces its resistance. The soil should be undisturbed, away from buried pipes, cables, or foundations. In dry climates the rod is sometimes placed near a downpipe or rainwater drainage point where soil stays naturally moist, improving conductivity year-round.
- 2
Drive the rod into the earth
A driving cap is fitted to the top of the rod to prevent the threads from mushrooming. Using an SDS hammer drill with a ground-rod adaptor (or a manual post-driver for shorter rods), the electrician drives the rod vertically until the top is just below finished ground level. If the rod hits rock before reaching depth, a coupler and extension section are fitted and driving continues. The rod should never be bent or laid at an angle to avoid an obstruction — resistance increases sharply.
- 3
Fit the earth rod clamp and run the conductor
A purpose-made brass or stainless earth rod clamp is tightened onto the rod at or just below ground level. The green-yellow earth conductor is stripped, inserted into the clamp, and the clamp bolts are torqued firmly — a poor connection here is one of the most common causes of high resistance readings. The conductor is then routed in conduit or along the wall to the main earthing terminal (MET) inside the distribution board.
- 4
Protect and label the installation
The rod head and clamp are either enclosed in a small inspection pit (a plastic or concrete earth-pit cover at ground level) or backfilled with moistened bentonite clay compound, which holds moisture around the rod and keeps resistivity low even in dry summers. The conductor where it exits the ground is protected against mechanical damage with a length of rigid conduit. A durable label reading 'Safety Electrical Earth — Do Not Remove' is fixed at the point of entry to the building.
- 5
Test and record the earth resistance
Before reconnecting the supply, the electrician performs a 3-pole earth resistance test using dedicated test spikes driven into the ground at set distances from the electrode. The measured resistance is logged. If it exceeds the target, an additional rod is added in parallel or a chemical earth enhancement compound is applied around the existing rod and the test is repeated. The test result, rod depth, location, and conductor size must appear in the electrical installation certificate issued after the work.
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FAQ
- Can I install an earthing rod myself to save money?
- Driving a rod into your garden is not electrically dangerous in itself, but connecting it to your distribution board is. In Greece, any modification to a fixed electrical installation requires a licensed electrical contractor. More importantly, without a calibrated earth-resistance tester you cannot know whether the rod is actually working — a poorly bonded or shallow rod can give a false sense of security while providing no real protection.
- How deep does the earthing rod need to go in Greek soil?
- The standard recommendation is at least 1.5 m, but in the dry, rocky, or sandy soils common across Greece that is often not enough. Your electrician will test resistance on-site and drive additional sections or install a second rod in parallel until the measured value is safely below the target. On very rocky plots a horizontal trench electrode buried at 0.5 m depth around the building perimeter is sometimes the only practical option.
- How often should an earthing rod be inspected or replaced?
- A visual inspection is recommended every 5 years, and a resistance measurement every 10 years or whenever major electrical work is done. Copper-clad steel rods can corrode at the clamp connection in saline coastal environments — properties near the sea should check more frequently. If resistance has crept above acceptable limits, the clamp can often be re-made or a supplementary rod added without replacing the whole installation.