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I have 230 voltage appliances, those are gifts from Germany. I live in Vietnam where the voltage is 220 V.

So can I use those appliances safely in my country?

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closed as off-topic by Leon Heller, Nick Alexeev Nov 28 '16 at 1:06

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – Leon Heller, Nick Alexeev
If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ Yes. 230V devices are rated for 230V±10%, so they operate as designed with anything from 207V to 253V. Out of that band, the appliance may not work. \$\endgroup\$ – Janka Nov 27 '16 at 12:10
  • \$\begingroup\$ Also, the mains frequency in both Germany and Vietnam is 50 Hz, so that will not present a problem. \$\endgroup\$ – Andrew Morton Nov 27 '16 at 18:27
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In EU, it was not always the 230VAC, but also 220VAC. Then some decades ago they changed to 230VAC, but still the old machines are 220VAC and they are all working. http://www.schneider-electric.co.uk/en/faqs/FA144717/

Currently, ALL Western European supplies are classified 230VAC. In reality there is no 230VAC supply unless you create one locally. 230VAC was a “standard” created during European "harmonisation" to give a single voltage standard across Western Europe, including UK and Irish Republic.

Although the ideal would have been to have a single voltage there were too many political, financial and technical obstacles to reduce UK voltage to European levels or to increase European voltage to UK levels, so a new standard was created to cover both. This was achieved by changing the tolerances of previously existing supply standards. UK voltage to 240VAC + 6% and - 10% and European to 220VAC +10% and -6% (thereby creating a manageable overlap) and we would call these two combined 230VAC, despite the fact that nobody was intentionally generating at 230VAC!

You see, it's just politics. Some they have still 220VAC and UK has still 240VAC, but we can say it's 230VAC with high tolerance window.

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