Which plug adaptor do I need when travelling from Japan to Cook Islands?

Summary

The table below summarises the plug types, voltage and frequency of electrical current in both Japan and Cook Islands.

	Japan	Cook Islands
Plug Types	A, B	I
Voltage	100V	240V
Frequency of electrical current	50Hz, 60Hz	50Hz

Plug Adaptors

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

What type of plug does your appliance have?

Type A
Type B

Your Appliance has Plug Type A

You will need this adaptor:

Socket Type
(Japan) to Plug Type I
(Cook Islands)

Your Appliance has Plug Type B

You will need this adaptor:

Socket Type
(Japan) to Plug Type I
(Cook Islands)

Warnings

Voltage

The voltages found in Japan and Cook Islands are significantly different.

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.

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 Cook Islands (240V)?

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

Considerations

Frequency of Electrical Current

As you are coming from Japan where more than one frequency exists, check that your appliances are compatible with the single frequency present in Cook Islands (50Hz).

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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