Dominica.

230 V · 50 Hz on Type D, Type G.

A 230 V 50 Hz island on the British pattern: UK-style Type G sockets alongside older round-pin Type D in some buildings. UK and Irish plugs fit the G outlets directly; everyone else wants a Type G adapter, and North American appliances must be dual-voltage to survive 230 V.

The voltage window

A nominal 230 V supply may legitimately sit anywhere between 207 and 253 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

Grid facts verified against IEC World Plugs — Dominica. Prose is our own.

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Pack an adapter — Dominica runs 230 V 50 Hz on Type D, Type G — and your 120 V appliances need to be dual-voltage or transformed, adapter or not.

Type A needs an adapter
Dominica's Type D / Type G sockets don't take a Type A plug.
the full story
Type B needs an adapter
Dominica's Type D / Type G sockets don't take a Type B plug.
the full story

Faces drawn to scale from pin dimensions · verdicts are physical fit + voltage math, not safety advice — when in doubt, ask the hardware store, not the internet.