Slovakia – Power plug, socket & mains voltage in Slovakia

What type of plugs and sockets are used in Slovakia?

When you are going on a trip to Slovakia, be sure to pack the appropriate travel plug adapter that fits the local sockets. But what do those electrical outlets look like? In Slovakia, types C and E are the official standards. Unlike almost all other European countries, Slovakia and its neighbouring countries the Czech Republic and Poland have standardized on the French plug and socket system. Fortunately, this does not pose a problem since the French standard is fully compatible with the German type F system, which is used in the rest of Continental Europe.

Background information

Type C Bakelite wall socket (1950s)

Slovakia has standardized on type E sockets and plugs. Type C and type F plugs can also be used thanks to their compatibility with type E sockets. However, it is not permitted to install type C wall outlets anymore. But why is that?

Power plug & outlet Type C

Typically, type C plug sockets are not allowed to be installed in Slovakia: these outlets are not earthed and are therefore considered dangerous. Only type E power points are permitted because they are grounded and therefore significantly safer.

The only (and rare) exception to this rule, is that an old type C outlet should be replaced by a new one. After all, if you hook up a grounded wall outlet (i.e. type E) on a two-wire circuit, the socket will not be grounded, but people will get the impression that it actually is grounded. No need to say, this is a potentially dangerous situation.

Nowadays, however, type C receptacles are not frequently installed anymore, since older properties are almost always completely rewired when they are renovated or significantly altered.

Power plug & outlet Type E

Obsolete type E plug, i.e. without top and bottom earthing clips nor plastic notches on the left and right.

Most European countries don’t have the same plug and socket standard as Slovakia; they use the German type F system instead. This used to be a problem because type E plugs and sockets were initially incompatible with type F. The reason for the incompatibility was that grounding in the type E socket is accomplished with a round male pin, which is permanently mounted in the socket. Type F outlets, on the other hand, are earthed by means of two sprung metal strips on the inside edge of the recessed socket which make a friction connection with similar metal strips on the sides of the plug body.

Old type F plugs did not have a grounding hole to accept the earth pin of the type E socket and old type E plugs did not have top and bottom indentations with earthing clips to mate with the type F socket. Moreover, old type E plugs were perfectly round and lacked a necessary pair of plastic notches on the left and right side to fit the type F socket.

Fortunately, the now standard hybrid E/F plug (officially called CEE 7/7) was developed in order to bridge the differences between E and F sockets, so technically type E and F plugs (not the sockets) have now become 100% identical.