The Cayman Islands runs on 120 V at 60 Hz, with sockets following Types A and B. The grid in the Cayman Islands delivers 120 V. Dual-voltage gear copes; single-voltage 230 V devices do not. The grid runs at 60 Hz. Chargers do not care; mains-synchronised clocks and simple motors do.
Handy for multi-stop trips: Antigua and Barbuda, Aruba, Honduras and El Salvador use the same plug types. Watch out when moving on: Grenada, Dominica and Greenland use a completely different system. In North and Central America, 24 of 31 recorded destinations use exactly this combination.
Protective earth
Grounded and ungrounded sockets may occur
Mixed supply: Type A without earth, Type B with earth. Which one is in your room only shows on arrival.
Check the rating plate: 120 V suits “100–240 V” supplies, not single-voltage appliances. Frequency is 60 Hz; timers and simple motors run differently. Check your own device →
The records list Types A and B; the grid supplies 120 V at 60 Hz.
Do I need a voltage converter for the Cayman Islands?
At 120 V it depends on the rating plate: “100–240 V” is fine, single-voltage gear is not.
An adapter changes the plug shape only, not voltage or frequency. the Cayman Islands supplies 120 V at 60 Hz – check the rating plate on your device. How to read a rating plate →
If a socket gets hot, crackles or smells burnt, unplug the device straight away.