The table below summarises the plug types, voltage and frequency of electrical current in both Tonga and St. Vincent (Winward Islands).
| Tonga | St. Vincent (Winward Islands) | |
|---|---|---|
| Plug Types | I | A, C, E, G, I, K |
| Voltage | 240V | 230V |
| Frequency of electrical current | 50Hz | 50Hz |
Tonga uses Plug Type I.
In St. Vincent (Winward Islands) there's more than one socket type in use. You may require more than one adaptor.
Socket Type I
(Tonga) to Plug Type A
(St. Vincent (Winward Islands))
Socket Type I
(Tonga) to Plug Type C
(St. Vincent (Winward Islands))
Socket Type I
(Tonga) to Plug Type E
(St. Vincent (Winward Islands))
Socket Type I
(Tonga) to Plug Type G
(St. Vincent (Winward Islands))
Socket Type I
(Tonga) to Plug Type K
(St. Vincent (Winward Islands))
St. Vincent (Winward Islands) also uses Socket Type I, which is used in Tonga. If using an appliance that has a Type I Plug in the Type I Sockets of St. Vincent (Winward Islands), you will not need an adaptor.
The voltages found in Tonga (240V) and St. Vincent (Winward Islands) (230V) are not exactly the same, but the difference is tolerable, so you should not need a transformer.
The frequency found in Tonga and St. Vincent (Winward Islands) is exactly the same (50Hz). Timing devices and appliances that use motors will function as expected under this frequency.