How to Check Whether Your Home Has Single-Phase or Three-Phase Power

The safest way to check whether your home has single-phase or three-phase power is to review your electricity bill, supply contract, meter label or existing electrical documents. If the information is unclear, contact your electricity supplier or a qualified electrical professional. Do not guess from the outlet colour or open the meter or distribution board.

1. Check your electricity bill or supply contract

Look for wording such as:

• Single-phase or 1-phase
• Three-phase or 3-phase

The wording and location vary between electricity suppliers. If the document does not state the number of phases clearly, do not try to determine it from other figures on the bill.

2. Check the outside of the electricity meter

Look only at information that is visible on the meter label or display. It may explicitly state “single-phase” or “three-phase”.

If you cannot understand the label, record the meter model and account or meter number. A clear photo of the front of the meter may also help your electricity supplier identify the supply.

Warning: Do not remove the meter cover, open sealed electrical equipment or touch any wiring.

3. Review the property’s electrical documents

Check any documents supplied with the property, including:

• Electrical installation records
• Distribution-board documentation
• Inspection or installation certificates
• Information provided by the landlord or property manager

Use only information that clearly states the number of phases. The number of switches or circuit breakers is not enough to confirm whether the property has single-phase or three-phase power.

4. Ask your electricity supplier or an electrical professional

If the phase information is still unclear, contact your electricity supplier or a qualified electrical professional. You can ask:

Is this property supplied with single-phase or three-phase power?

Prepare the following information before contacting them:

• Property address
• Electricity account or meter number
• A photo of the meter’s front label
• Any available electrical installation documents

Compare the confirmed supply with the charger manual

After confirming the number of phases, check the voltage, current and phase requirements in the manual for the exact charger version.

dé Wallbox example	Input specification in its manual
7 kW Wallbox with Cable	230 V, single-phase, maximum 7.4 kW at 32 A
11 kW Wallbox with Cable	400 V, three-phase, maximum 11 kW at 16 A
22 kW Wallbox with Cable	400 V, three-phase, maximum 22 kW at 32 A

These are charger input specifications. They do not confirm that a particular home can supply the required voltage or current. Check the exact model in the 7/11/22 kW Wallbox user manuals before making a product or installation decision.

Do not identify the supply by appearance alone

• Do not use the colour of an outlet as the only evidence.
• Do not count circuit breakers or switches to determine the number of phases.
• Do not open the distribution board to inspect the wiring.
• Do not assume that having three-phase power means the supply can provide the current required by every three-phase charger.

Once the supply phase has been confirmed, continue by checking the charger’s voltage, current and input-connection requirements. If any of these details remain unclear, ask the electricity supplier or a qualified electrical professional before choosing or connecting the charger.