You Do Need power plug adapter while traveling from New Caledonia to Ireland (Eire).

Here is Why You Need An Adapter

The outlet and plug type used in Ireland (Eire) is G and in New Caledonia are C and F. This is how they look like.

In New Caledonia, outlets of type C and F are in use.

Type C

Type F

In Ireland (Eire), outlets of type G are in use.

Type G

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