The table below summarizes information on the electrical systems in use in most countries of the world.
| COUNTRY | VOLTAGE | FREQUENCY | PLUG | COMMENTS |
| Afghanistan | 220 V | 50 Hz | C & F * | * A UN correspondent reports C and F common in Kabul, but its likely a variety of plugs may be used around the country. Some sources report Type D also in use. Other reports indicate voltage variances from 160V to 280V. |
| Albania | 220 V* | 50 Hz | C & F | *Voltage variations common |
| Algeria | 230 V | 50 Hz | C* & F | *A variation of Type C with a ground post offset about 1/2-inch from center may also be found. |
| American Samoa | 120 V | 60 Hz | A, B, F & I | |
| Andorra | 230 V | 50 Hz | C & F | |
| Angola | 220 V | 50 Hz | C | |
| Anguilla | 110 V | 60 Hz | A (maybe B) | |
| Antigua | 230 V* | 60 Hz | A & B | *Airport area is reportedly Antigua power is 110 V. |
| Argentina | 220 V | 50 Hz | C & I* | *Neutral and line wires are reversed from that used in Australia and elsewhere. Click here for more. |
| Armenia | 220 V | 50 Hz | Type C Electrical Outlet & F | |
| Aruba | 127 V* | 60 Hz | A, B & F | *Lago Colony 115V |
| Australia | 240 V | 50 Hz | I | *Outlets typically controlled by adjacent switch. Click here for more. |
| Austria | 230 V | 50 Hz | F | Type C may be found, but rare. |
| Azerbaijan | 220 V | 50 Hz | C, F | |
| Azores | 220 V* | 50 Hz | B, C, & F | *Ponta Delgada 110 V; to be converted to 220 V |
| Bahamas | 120 V | 60 Hz | A & B | |
| Bahrain | 230 V* | 50 Hz* | G | *Awali 110 V, 60 Hz |
| Balearic Islands | 220 V | 50 Hz | C & F | |
| Bangladesh | 220 V | 50 Hz | A, C, D, G & K | |
| Barbados | 115V | 50 Hz | A, B | |
| Belarus | 220 V | 50 Hz | C & F | |
| Belgium | 230 V | 50 Hz | E | Notes from correspondents: a `C` style plug can be used with `E` and `F` receptacles. All double-insulated appliances are indeed fitted with a `C` plug, and can be used in any compatible receptacle (C E F and narrow L). Type C receptacles are prohibited in Belgium. |
| Belize | 110/220 V | 60 Hz | B & G | |
| Benin | 220 V | 50 Hz | E | |
| Bermuda | 120 V | 60 Hz | A & B | |
| Bhutan | 230 V | 50 Hz | D, F, & G | Type M plugs also identified by some sources. |
| Bolivia | 220/230 V* | 50 Hz | A & C | *La Paz & Viacha 115V |
| Bosnia | 220 V | 50 Hz | C & F | |
| Botswana | 231V | 50 Hz | M | Type G may be found, but rare. |
| Brazil | 110/220 V* | 60 Hz | A & B, C | *127 V found in states of Bahia, Paraná (including Curitiba), Rio de Janeiro, São Paulo and Minas Gerais (though 220 V may be found in some hotels). Other areas are 220 V only, with the exception of Fortaleza (240 V). Outlets (click for more) are often a combination of type A and C and can accept either type plug. |
| Brunei | 240 V | 50 Hz | G | |
| Bulgaria | 230 V | 50 Hz | C* & F* | *Outlets are reported as type F, though both type C and F plugs may be encountered. |
| Burkina Faso | 220 V | 50 Hz | C & E | |
| Burundi | 220 V | 50 Hz | C & E | |
| Cambodia | 230 V | <span id="ctl00_Con | Croatia | 230 V 50 Hz C&F |
| Cuba | 110/220 V | 60 Hz | A & B, C, F & L | Most older hotels 110 V. Some newer hotels 220 V. Some outlets are a combination of type A and C and can accept either type plug. |
| Cyprus | 240 V | 50 Hz | G | |
| Czech Republic | 230 V | 50 Hz | E | |
| Denmark | 230 V | 50 Hz | C & K | Denmark `s connectors have slight differences from those used elsewhere. While pin diameter and spacing is standard, outlets may have different housing depths which could interfere with standard adaptors -- one report says this is due to "childproofing." Also, Plug C fits into K-type outlets (but not vice versa). |
| Djibouti | 220 V | 50 Hz | C & E | |
| Dominica | 230 V | 50 Hz | D & G | |
| Dominican Republic | 110 V | 60 Hz | A | Type J may exist in some hotels. |
| East Timor | 220 V | 50 Hz | C, E, F, I, | A UN correspondent reports "power is poor in the country with frequent brownouts and blackouts. I suspect that surges are frequent as we go through a lot of surge-protecting power bars." Further he reports than Type I is common as much construction is done by Australians; type C is common in building built during Indonesian occupation; type E is less common; type F is common in offices but not hotels. |
| Ecuador | 120-127 V | 60 Hz | A & B | |
| Egypt | 220 V | 50 Hz | C | |
| El Salvador | 115V | 60 Hz | A & B | |
| England (See United Kingdom) | ||||
| Equatorial Guinea | 220 V* | 50 Hz | C & E | *Voltage varies between 150 & 175V with frequent outages |
| Eritrea | 230 V | 50 Hz | C | |
| Estonia | 230 V | 50 Hz | F | Type C may be found in older buildings. Type E plugs may work in either C or F type outlets. |
| Ethiopia | 220 V | 50 Hz | D, J, & L | |
| Faeroe Islands | 220 V | 50 Hz | C & K | |
| Falkland Islands | 240 V | 50 Hz | G | |
| Fiji | 240 V | 50 Hz | I | |
| Finland | 230 V | 50 Hz | C & F | |
| France | 230 V | 50 Hz | E | Type C plugs may be found on some appliances, and will fit the Type E outlet. Type C outlets may be found in older buildings. Type A may be found in older buildings but is illegal. |
| French Guiana | 220 V | 50 Hz | C, & E | |
| Gaza | 230 V | 50 Hz | H | |
| Gabon | 220 V | 50 Hz | C | |
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