Poland.

230 V · 50 Hz on Type E, Type C.

Poland uses the French-style Type E socket — recessed, with an earth pin protruding from the wall — at 230 V and 50 Hz. Europlugs and the hybrid earthed plugs on most European appliances fit directly, so in practice continental travellers notice nothing. UK and North American visitors need adapters, the latter dual-voltage gear too.

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 — Poland. Prose is our own.

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

Type A needs an adapter
Poland's Type E / Type C sockets don't take a Type A plug.
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Type B needs an adapter
Poland's Type E / 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.