You Do Need power plug adapter while traveling from Channel Islands (Guernsey & Jersey) to South Sudan.

Here is Why You Need An Adapter

The outlet and plug type used in South Sudan are C and D and in Channel Islands (Guernsey & Jersey) are C and G. This is how they look like.

In Channel Islands (Guernsey & Jersey), outlets of type C and G are in use.

Type C

Type G

In South Sudan, outlets of type C and D are in use.

Type C

Type D

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