The European Standard EN 50110 series consists of two parts:
- the first part, EN 50110 1, contains minimum requirements valid for all CENELEC countries and some additional informative annexes dealing with safe working;
- the second part, prEN 50110 2, is a set of national annexes (one per each member country) which specify either additional safety requirements actually in force or national supplements to the minimum requirements set by EN 50110-1.
The national annexes are the responsibility of an have to be maintained by the respective member country.
National Committees shall notify CENELEC of any changes needed to their national annex.