You cannot tell from the sockets — they look identical on either supply. Whether a house has three-phase power is decided where the service enters the building, and the reliable evidence is documentary: the wording on your electricity bill or online account, the labels on the meter, and above all your network operator’s record of your supply. An electrician can confirm it at the consumer unit in minutes. Your part is only to look, photograph and ask — never to open anything or touch a conductor.
Key Takeaways
- Nothing at the sockets tells you: single-phase or three-phase is a property of the service, proven by records and labels.
- The evidence ladder is your bill, the meter’s external labels, photographs of the consumer unit — then the network operator’s record as the definitive answer.
- House size, existing chargers, industrial sockets and neighbours’ supplies are all misleading signs.
- Look, photograph and ask — confirmation is read-only, and any hands-on check is an electrician’s.
The Evidence Ladder
Work down this ladder. Each rung is read-only and owner-safe; the higher rungs are strong signs, the lower ones are the verdict:
| Evidence | What to look for | How strong it is |
|---|---|---|
| Your bill or online account | The supply described as three-phase, or a meter arrangement recorded in three phases | A strong sign — the utility’s own paperwork about your service |
| The meter’s external labels | “Three-phase” wording on the meter, or separate readings shown per phase | A strong sign — read the outside only; the meter is the utility’s equipment |
| The consumer unit, from outside | The labels and the main switch arrangement, photographed as they are | A sign an electrician reads properly — photographs are for them, not a verdict for you |
| The network operator’s record | Ask the DNO or utility what supply type they hold for your address | The definitive source — their record is what any upgrade or installation is designed against |
| An electrician’s survey | Confirmation at the board, alongside the load assessment a charger quote needs anyway | The working verdict your installation proceeds on |
Signs That Mislead
Some common clues feel convincing and prove nothing:
- A large house. Size says nothing about the service; big homes are routinely single-phase, and small workshops can be three-phase.
- A charger already on the wall. A unit labelled 22 kW does not prove the supply behind it — it may be running below its rating, or have been fitted ahead of other work.
- An industrial-looking socket. A socket is an outlet someone fitted, not the service itself; it shows what a previous installer did, not what the network delivers.
- The neighbours’ supplies. Every service is its own record. The house next door having three phases tells you the network can provide it — not that yours does.
Why It Matters for Charging
The 11 kW and 22 kW charging classes are three-phase classes: they deliver their rating by spreading the current across three phases, as our single-phase vs three-phase explainer sets out. So the answer to this article’s question decides which chargers are even candidates. The ACS1605PE (11 kW three-phase portable, 16 A per phase, CEE five-pin plug, Type 2, IP66) delivers its rating only on a three-phase supply, and the EV-ACT3204PE (22 kW wallbox, three-phase, tethered Type 2 cable, RFID and app, IP66, CE) is a three-phase unit outright. If your record says single-phase, the choices are single-phase chargers now — the 7 kW class covers most home driving — or the upgrade route: an application to your network operator, who design and price the new service as their own project.
Frequently Asked Questions
Can my electricity supplier just tell me?
Yes — ask them, or your network operator, what supply type is recorded for your address. That record is the definitive answer, and it costs one phone call or message.
My meter shows three sets of readings. Is that proof?
It is a strong sign — meters record per phase on a three-phase supply. Treat it as near-certain, and still let the record or an electrician confirm it before an installation is designed around it.
The previous owner ran a workshop here. Does that mean three-phase?
No. A workshop is history, not evidence — machinery may have been single-phase, or a three-phase supply may have been altered since. The record for your address is the only version that counts.
Related Reading
- Single-Phase vs Three-Phase EV Charging: 7 kW, 11 kW and 22 kW Explained
- Portable EV Charger Types Explained: 10A, 16A, 32A and Three-Phase Models
- CEE Plugs Explained: Choosing 16A or 32A for a Three-Phase Portable EV Charger
- What Size EV Charger Can I Have at Home? Panel Capacity Explained
