Single-phase and three-phase elevators can both meet household travel needs when the equipment and power supply are chosen appropriately. Homeowners should establish the rated load, car dimensions and level of use first, then check the input supply requirements of the proposed model. Viet Chao explains the differences between these options and what to prepare before installation.

How do single-phase and three-phase elevators differ?

The main difference is the input power supply required when the elevator is installed.

Single-phase elevators use the normal 220V household supply, the same type used for televisions, refrigerators and washing machines. They suit homes and townhouses and do not require an additional utility supply line.

Three-phase elevators require a 380V three-phase supply, commonly available in office buildings, apartment buildings and factories. If the home does not have three-phase electricity, the owner must arrange an additional utility connection, adding time and cost.

One point can be confusing: a “three-phase” label on an internal machine does not necessarily mean that the elevator requires a three-phase input. Some elevators accept a single-phase input and use internal conversion equipment. Do not decide from the machine label alone. Ask the supplier directly: “My home only has single-phase electricity. Can this model be installed?” Have the input supply requirements recorded in the technical documents before signing the contract.

Comparing single-phase and three-phase elevators

Compare the two options against the conditions in your home and the models that meet your needs. A single-phase model can use the existing household supply if its capacity is adequate; a three-phase supply makes it possible to choose equipment requiring that input.

A single-phase elevator is not always more economical, and a three-phase elevator does not always perform better. Efficiency depends on factors including elevator technology. The user experience also depends on equipment design, supply quality, installation and maintenance.

When should a household consider a single-phase elevator?

A single-phase elevator is worth considering when the property has no three-phase supply and a suitable model meets household needs. It can reduce the need for a supply upgrade if the existing electrical system can serve both the elevator and household appliances.

Discuss the following with your adviser:

• Users: How many people normally travel together, and is space needed for an accompanying helper?
• Frequency: Is the elevator for normal household use, or more frequent travel associated with a business, office or rental property?
• Floors and travel: Can the proposed model serve the required stops and travel height?
• Existing supply: Is capacity sufficient when air conditioners, electric cooking equipment and other appliances operate together?
• Future needs: Could the number of users or the use of the building change?

An existing single-phase connection does not mean that an elevator can simply be connected and used. Wiring, protection devices and available supply capacity must still be checked before the proposal is finalized.

Do not treat a particular rated load or travel height as a universal limit for all single-phase elevators. Confirm these limits for each model.

When is a three-phase supply needed?

Prepare a three-phase supply when the selected model requires it. Confirm this before signing the contract, especially if the building currently has only a single-phase household connection.

For a large household, a home combined with a business or frequent transport needs, first identify equipment that meets the expected usage. If the suitable option requires three-phase electricity, coordinate with the utility to check supply availability.

Arrange the following early:

• Confirm the proposed model’s electrical requirements in the technical documents.
• Check whether the building already has a three-phase supply.
• Consult the utility about supply feasibility and the applicable upgrade procedures.
• Agree who prepares the circuit from the meter to the elevator supply point.
• Coordinate electrical work with installation, testing and handover.

Even if the home already has three-phase electricity, check supply capacity and wiring. An existing connection does not replace checking the equipment requirements.

Which supply helps an elevator use less electricity?

The number of phases does not determine the electricity bill. Consumption depends on other factors.

What affects an elevator’s electricity bill?

Monthly electricity use depends on:

• How much it is used: trips per day and the number of floors travelled.
• The load carried: a fully occupied car uses more electricity than a lightly loaded car.
• Elevator technology: newer equipment is generally more energy efficient than older equipment.
• Standby consumption: car lighting, fans and controls can still consume electricity while the elevator is idle.

Distinguish these two commonly confused measurements:

• kW: the elevator’s maximum power, comparable to an engine’s power rating. This figure alone does not calculate the electricity bill.
• kWh: the energy actually consumed during the month, as recorded on the electricity bill.

Multiplying the kW rating by 24 hours and then by 30 days gives an incorrect estimate because the elevator does not run continuously at maximum power day and night.

What should you ask when comparing two models?

Rather than asking whether single-phase or three-phase equipment costs more to run, ask suppliers for actual kWh consumption under comparable conditions, such as the same daily trips and floors served. After installation, a dedicated electricity meter can help compare actual consumption with the supplier’s estimate.

Three-phase electricity does not automatically qualify for a lower industrial tariff. The applicable tariff depends on the building’s purpose of use and electricity contract. Check the bill and contract with the utility to confirm the charging structure.

Read more: Elevator running costs | Expenses to budget for after handover.

What should a home with single-phase electricity prepare?

Provide information about the existing supply when requesting advice. The elevator supplier confirms equipment requirements; the building’s electrical specialist checks the actual system and identifies the work required.

Cable sizes and protection ratings should not be selected from the elevator’s rated load alone. Qualified specialists must determine them from the equipment requirements and installation conditions.

Homeowners should not connect the equipment themselves or alter the controls to use a supply different from the design. The supplier must assess any proposed changes first.

Related reading: Elevators for a 1.5 × 1.5 m space — points to check where installation space is limited. See elevator consulting and design for planning support.

What supply details should you confirm with the supplier?

Before deciding on installation, ask the supplier to clarify:

• Model and configuration: the exact elevator and included equipment.
• Supply requirements: single-phase or three-phase input, voltage and frequency.
• Required capacity: the power capacity that must be available.
• Homeowner’s electrical work: items to complete before elevator installation.
• Supplier responsibilities: who checks the supply, connects the equipment and conducts test runs.
• Power outage arrangements: what supporting equipment is provided and exactly how it operates.

With experience in elevator consultation and installation, Viet Chao helps homeowners select equipment suited to their needs and actual site conditions. Supply requirements are clarified during consultation so that preparation can be planned and installation problems avoided.

Send the number of floors, intended use and existing supply details to Viet Chao via hotline 0898 55 28 88. The team can advise on a suitable model and explain the electrical work to prepare before installation.

Frequently asked questions

Can a home with single-phase electricity install an elevator?

Yes, if the selected model supports a single-phase input and the electrical system meets its requirements. Check actual supply capacity, wiring and protection devices before installation.

Must a 350 kg elevator use single-phase electricity?

No. Models with the same 350 kg rated load can have different designs and input requirements. Check the exact model specifications rather than deciding from capacity alone.

Does a three-phase supply automatically receive industrial electricity rates?

No. The number of phases does not determine the purpose of use or tariff. Check the electricity contract and confirm the applicable charging method with the utility.

Can I add a converter myself to change the elevator’s supply?

Do not make this change yourself. Changing the supply can affect controls, protection and operation. Have the supplier assess and confirm an appropriate solution first.