Voltage Levels
All of Europe, Africa, Asia, Australia, New Zealand and most of South America use a supply that is within 6% of 230 V, whereas Japan, Taiwan, North America and some parts of northern South America use a voltage between 100 and 127 V. The 230 V standard has become the most widespread so that standard 230 V equipment can be used in most parts of the world with the aid of an adapter or a change to the equipment's connection plug for the specific country. In the UK electricity is supplied at 230 V +10% - 6% (BS 7671 Appendix 2 section 14. )
Read more about this topic: Mains Electricity
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