Which plug adaptor do I need when travelling from Vietnam to United States of America?

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Summary

The table below summarises the plug types, voltage and frequency of electrical current in both Vietnam and United States of America.

VietnamUnited States of America
Plug TypesA, C, GA, B
Voltage127V, 220V120V
Frequency of electrical current50Hz60Hz

Plug Adaptors

In Vietnam there's more than one plug type in use.

What type of plug does your appliance have?

Your Appliance has Plug Type A

In United States of America there's more than one socket type in use.

You will need this adaptor:

Socket Type
(Vietnam) to Plug Type B
(United States of America)

United States of America also uses Socket Type A, which is used in Vietnam. If using an appliance that has a Type A Plug in the Type A Sockets of United States of America, you will not need an adaptor.

Your Appliance has Plug Type C

In United States of America there's more than one socket type in use. You may require more than one adaptor.

Socket Type C
(Vietnam) to Plug Type A
(United States of America)

Socket Type C
(Vietnam) to Plug Type B
(United States of America)

Your Appliance has Plug Type G

In United States of America there's more than one socket type in use. You may require more than one adaptor.

Socket Type G
(Vietnam) to Plug Type A
(United States of America)

Socket Type G
(Vietnam) to Plug Type B
(United States of America)

Warnings

Voltage

The voltage, 220V, which is present in Vietnam, is significantly different to what's used in United States of America.

Some appliances are compatible with multiple voltages. To find out if your appliance is one of them, check the appliance label and/or instruction booklet. An example appliance label is below.

Appliance label showing a tolerable voltage range of 100 to 240 volts
This appliance is compatible with a range of voltages as it shows two voltage figures with a dash in between them. In this example, the appliance may be plugged into any outlet ranging from 100 to 240V without a voltage transformer, though a socket adaptor would still be needed if the sockets don't match.

See examples of appliance labels

Appliance label showing a voltage of 120 volts
This appliance is only compatible with a single voltage as only one voltage (120V) is printed on the label.
Appliance label showing a tolerable voltage range of 100 to 240 volts
This appliance is compatible with a range of voltages as it shows two voltage figures with a dash in between them. In this example, the appliance may be plugged into any outlet ranging from 100 to 240V without a voltage transformer, though a socket adaptor would still be needed if the sockets don't match.
Appliance label showing two tolerable voltages: 115 volts and 230 volts
This appliance is compatible two voltages as it shows two voltage figures with a slash between them. Appliances displaying labels like this will have a physical switch located on them somewhere, allowing you to switch between the two voltages shown here. In this example, the appliance may be plugged into an outlet of 115V or 240V (provided the switch is in the correct position) without a voltage transformer, though a socket adaptor would still be needed if the sockets don't match.

Is your appliance compatible with the voltage used in United States of America (120V)?

If your appliance is not compatible with multiple voltages, you will need a transformer to adjust the voltage input when using your appliance in United States of America.

Considerations

Voltage

The voltage, 127V, which is also present in Vietnam, is not exactly the same to what's used in United States of America, but the difference is tolerable, so you should not need a transformer when using sockets with this voltage. Be sure to carefully check the voltage before using your appliance in sockets in United States of America. You may need to ask a local resident, an electrician, or the local government to find out in situations when the power sockets are not labelled with their voltages.

Frequency of Electrical Current

The frequency of electrical current found in Vietnam (50Hz) differs to that found in United States of America (60Hz).

Most equipment is not affected by differences in frequencies. Some exceptions are:

  • Electric clocks: Some electric clocks use the frequency of electrical current to measure time. If the clock is designed for one frequency, but used with another, time shifts could be experienced.
  • Appliances using motors: If there is a motor load associated with an appliance, the frequency governs the speed in revolutions of the motor. This could mean that the motor will spin faster, or slower than intended and could have a detrimental effect in the appliance's operation. This is of particular concern in power tools and other machinery that uses motors, so if you must use these, you should seek access to a frequency converter.

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