Do I have three-phase power at home? How to tell

Written by Engin Demirel · Electrical technician, master instructor · 12 years of experience

Short answer: the easiest place to check is the meter: a three-phase meter is labelled "3x230/400 V" or "3~", while a single-phase meter shows "230 V". The second sign is the main switch: with three-phase it is 3 or 4 poles wide (three or four modules switched by one lever). Your supply contract and grid operator can also confirm the connection type. These checks are done without opening covers; any measurement inside the consumer unit or meter must be done by a qualified electrician.

Why it matters

EV charging: single phase allows at most 7.4 kW; 11 or 22 kW charging needs three-phase.
Large appliances: some induction hobs, heat pumps, saunas and workshop machines are connected to three phases.
Load spreading: with three phases the household load is shared over three lines.

See single-phase vs three-phase for details.

1. The meter label

The front of the meter shows the voltage and connection:

"3x230/400 V", "3x220/380 V" or "3~": three-phase.
Only "230 V" or "220 V": single-phase.

If an electronic meter shows L1, L2, L3 indicators or three separate phase readings, it is three-phase.

2. Main switch and main fuse

Look at the main switch at the start of your consumer unit:

3 or 4 modules wide, switched by a single lever: three-phase.
1 or 2 modules wide: single-phase.

Labels such as "3P", "3P+N" or "4P" also indicate three-phase. Some circuit breakers (for example the hob circuit) may also be 3-pole.

3. Your supply contract

Your electricity supply contract or your grid operator states the connection type (single/three-phase) and capacity. You can ask with your customer or meter number.

4. Cable colours (look only)

In a three-phase supply there are three phase conductors, brown, black and grey under the European colour code, plus a blue neutral and a green-yellow earth. Single-phase has one phase (usually brown), neutral and earth. Older installations may use other colours, so colour alone is not proof. Opening covers and touching conductors is dangerous: leave this to an electrician.

5. Measurement (electrician only)

The definitive answer is a measurement: about 400 V between two phases and about 230 V phase to neutral. This is done on a live board and must be done by a qualified electrician with proper equipment.

I have single-phase, what now?

For EV charging, a 7.4 kW single-phase solution is enough for most people; overnight it adds about 300 km.
Upgrading to three-phase is applied for at the grid operator; local rules and costs differ.
Check your car's AC charging power: a car that accepts 7.4 kW on AC does not need three-phase.

Our EV charger finder suggests a charger based on your phase type, with an "I don't know" option.

Frequently asked questions

How do I know if I have three-phase power?

If the meter is labelled "3x230/400 V" or "3~" and the main switch is 3–4 poles wide (three or four modules on one lever), you have three-phase. Your supply contract or grid operator can confirm it.

What does a three-phase meter look like?

It is labelled 3x230/400 V or 3~, may show L1, L2, L3 indicators, and has three phase conductors at its input. A single-phase meter shows only 230 V.

Do I need three-phase for an EV charger?

No. Single phase allows charging at up to 7.4 kW, adding well over 300 km overnight for most cars. 11 and 22 kW charging needs three-phase.

How do I upgrade from single-phase to three-phase?

Apply to your grid operator; the building's supply capacity is assessed and wiring changes may be needed. Rules and costs vary by country.

Can I tell three-phase from the cable colours?

Three-phase has brown, black and grey phase conductors under the European code, but older installations differ and looking inside the board is dangerous. A measurement by an electrician gives the definitive answer.