![]() ![]() You are better off seeking a quality unit that focuses on US to UK only, and better off buying it at a local shop, where safety regulations are able to have an effect on the quality of their selection. Beware buying such junk, as it can create safety issues of its own, especially if you plug in something with a high power draw. ![]() This particular one is a highly compromised "universal" adapter meant to plug anything (even UK) to UK. ![]() It is unfit to be marketed as a US to UK adapter, since it lacks the correct keying for polarized plugs, which are very common. Whoever sold that to you sells cheap Cheese junk. It is not to be confused with the safety ground, that third pin on US and UK plugs. Neutral is a worldwide concept (except Philippines), it is a wire (typically 1 of 2) in the supply loop which is manipulated to be near natural earth, so does not present a shock hazard if your body got between neutral and earth. That means "the present" is not double-insulated and it is much safer when the wide blade is connected to neutral. That plug is a NEMA 1-15 plug that is polarized. Such adapters either have some electronics onboard (which can serve only limited load capacity, in watts), or are a bulky and very dense transformer (the larger, the higher the capacity in watts, clear up to the 1800W max a US device might draw if you don't mind a 15kg transformer). They make larger and more complex adapters which convert voltage. If not, you should not use an adapter like this, which will straight-shot 240V into your device. Does "the present" say in its labeling or instructions that it is able to run on 240V? Many things can, many more cannot. (North America has other plug keyings intended for 240V). The shape of the plug is keyed for 120V only. ![]()
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