Summary

The table below summarises the plug types, voltage and frequency of electrical current in both Montserrat (Leeward Islands) and Madeira.

	Montserrat (Leeward Islands)	Madeira
Plug Types	A, B	C, F
Voltage	230V	220V
Frequency of electrical current	60Hz	50Hz

Plug Adaptors

In Montserrat (Leeward Islands) there's more than one plug type in use.

What type of plug does your appliance have?

• Type A
• Type B

Considerations

Voltage

The voltages found in Montserrat (Leeward Islands) (230V) and Madeira (220V) are not exactly the same, but the difference is tolerable, so you should not need a transformer.

Frequency of Electrical Current

The frequency of electrical current found in Montserrat (Leeward Islands) (60Hz) differs to that found in Madeira (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.