The Short Answer
It depends on how your house is earthed — not on the charger. Homes earthed through a local earth rod (a TT supply) generally don't need a new one. Homes earthed through the ESB network (TN-C-S, also called PME — most newer Irish homes) do usually need an earth rod, or another certified protection arrangement, before an outdoor EV charge point can be installed. That isn't installer upselling; it's a requirement of I.S. 10101, Ireland's National Rules for Electrical Installations.
First: What an Earth Rod Is
An earth rod is a copper-bonded rod driven into the ground near your meter, connecting your electrical installation directly to the earth itself. If you have one, it's usually under a small green or black inspection box in the ground close to the meter. Older Irish homes were typically earthed this way — a TT system in the jargon.
Many newer homes (and supplies upgraded in recent years) instead take their earth from the ESB supply cable — a TN-C-S / PME system, where one conductor in the network does double duty as neutral and earth. On those homes there is no earth rod box to find, and that's normal, not a fault. It's one of the most common worries we hear during photo assessment, and it's almost never a problem with the house.
Why EV Chargers Change the Picture
For everything inside the house, TN-C-S earthing is fine. The issue is specific to charging a car outdoors.
On a TN-C-S supply, if the combined neutral-earth conductor out in the network is ever damaged or disconnected — a fault called a broken PEN or open-PEN — the metal parts of everything earthed off that supply can rise to a dangerous voltage. Inside the house the risk is managed. But a person standing on the ground outside, touching a car that's connected to the charger, completes a path the safety rules treat very seriously.
That's why I.S. 10101 (Section 722, which covers EV charging installations) requires an outdoor charge point on a TN-C-S/PME supply to have a compliant answer to open-PEN risk. In practice there are two routes:
- Install an earth rod for the charger circuit — the charger gets its own independent connection to earth (a TT arrangement for that circuit), so a network PEN fault can't make the car live. This is the long-established, conservative solution.
- Use a charger or device with certified open-PEN protection — some chargers have built-in electronics certified to detect a PEN fault and disconnect everything, including earth. This only counts if the manufacturer documents that capability to the standard; the electrician certifying the job needs that evidence in writing, not a marketing bullet point.
Our default is the earth rod on PME jobs. We only rely on built-in protection where the manufacturer's documentation explicitly supports it — having reviewed our own charger's datasheet, we don't claim it, and we install accordingly.
So Which Is Your House?
A rough guide — the installer confirms the supply type before any work:
- Older home with a green/black box in the ground near the meter: likely TT. You probably already have a rod; the electrician tests it rather than installing a new one.
- Newer build (or you can't find any rod): likely TN-C-S/PME. Expect the earth rod conversation — it's standard, quick to resolve, and confirmed before installation day.
- Genuinely unsure: that's fine. This is exactly what the assessment is for.
In our photo assessment we ask for a photo of the earthing arrangement — and "can't find one" plus a note is a perfectly valid answer. A Safe Electric registered electrician confirms the supply type and the compliant earthing route as part of pre-approval, so nothing about earthing should ever be a surprise during EV charger installation. For the full walkthrough of the day itself, see what happens on installation day.
What It Means for the Job
Driving an earth rod is routine work: a rod near the charger or meter position, a connection into the charger circuit, then testing to verify the earth resistance is within limits. It adds a little time to the installation and it's captured in the certification — for grant jobs, the Safe Electric Certificate No. 3 and Test Record Sheet that SEAI requires for the €300 claim include the earthing test results.
Two things to be wary of from any installer:
- "No rod needed, the charger has protection built in" — ask for the manufacturer's documentation naming open-PEN/PEN-fault protection to I.S. 10101 or BS 7671 Section 722. If they can't produce it, the rod is the safe answer.
- "We always fit a rod, even on TT supplies" — if you already have a tested, compliant rod, a second one isn't automatically required. The right answer comes from testing, not a blanket policy.
Bottom Line
No earth rod at your house is normal, especially on newer builds — and needing one for an EV charger on a PME supply is equally normal. It's a safety requirement of the national wiring rules, it's confirmed during assessment rather than sprung on you later, and it's one of the clearest signs you're dealing with an installer doing the job properly. Start your photo assessment and we'll tell you exactly where your home stands before you commit to anything.