You Do Need power plug adapter while traveling from American Samoa to Norfolk Island.

Here is Why You Need An Adapter

The outlet and plug type used in Norfolk Island is I and in American Samoa are A, B, F and I. This is how they look like.

American Samoa

In American Samoa, outlets of type A, B, F and I are in use.

Type A

Type B

Type F

Type I

Norfolk Island

In Norfolk Island, outlets of type I are in use.

Type I