You Do Need power plug adapter while traveling from San Marino to New Caledonia.

Here is Why You Need An Adapter

The outlet and plug type used in New Caledonia are C and F and in San Marino are C, F and L. This is how they look like.

San Marino

In San Marino, outlets of type C, F and L are in use.

Type C

Type F

Type L

New Caledonia

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

Type C

Type F