Gibraltar.

240 V · 50 Hz on Type G, Type C.

British territory, British sockets: 240 V 50 Hz through fused Type G outlets, with the odd continental Type C socket reflecting the Spanish surroundings. UK plugs work directly; visitors from Spain should still carry a Type G adapter rather than count on finding a two-pin outlet.

The voltage window

A nominal 240 V supply may legitimately sit anywhere between 216 and 264 V (±10%). Dual-voltage gear (marked 100–240 V) shrugs at all of it.

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

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Pack an adapter — Gibraltar runs 240 V 50 Hz on Type G, Type C — and your 120 V appliances need to be dual-voltage or transformed, adapter or not.

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