Compare the plug shapes, voltage and frequency in São Tomé and Príncipe and Sierra Leone, and find out which adapter you need before you travel.
Adapter required
Yes — coming from São Tomé and Príncipe, you will need a travel adapter for Sierra Leone. São Tomé and Príncipe uses Type C/Type F plugs, and Sierra Leone uses Type G, so the pin shapes will not fit any wall socket.
São Tomé and Príncipe (home)
Sierra Leone (destination)
Electrical specifications in Sierra Leone
Voltage
Frequency
More about plugs in Sierra Leone
In Sierra Leone, the standard power plug is Type G. The country runs on 230 volts at 50 Hz. That means every wall socket in Sierra Leone is the same shape — Type G, and your plug needs to physically match the socket to fit.
Full Sierra Leone plug guide