You Do Need power plug adapter while traveling from Liberia to South Africa.

Here is Why You Need An Adapter

The outlet and plug type used in South Africa are C, M and N and in Liberia are A, B, C and F. This is how they look like.

Liberia

In Liberia, outlets of type A, B, C and F are in use.

Type A

Type B

Type C

Type F

South Africa

In South Africa, outlets of type C, M and N are in use.

Type C

Type M

Type N