This clause of Part 1 applies with the following additions. Addition: This standard gives specific requirements for public electricity network distribution assemblies (PENDAs)@ which are stationary assemblies verified by verification tests@ as defined in this standard. These ASSEMBLIES are used for the distribution of electrical energy in three-phase systems (see Figure 101 for a typical distribution network). Open type ASSEMBLIES are not covered by this standard. The object of this standard is to state the definitions and to specify the service conditions@ construction requirements@ technical characteristics and tests for PENDAs. Network parameters may require tests at higher performance levels. NOTE 1 If a PENDA is equipped with additional equipment (for example meters)@ in such a way that the main function is changed considerably@ then other standards may also apply as agreed between user and manufacturer (see 8.5). NOTE 2 Where local regulations and practices permit@ a PENDA according to this standard may be used in other than public networks. PENDAs are suitable for installation in places where only skilled persons have access for their use@ however@ outdoor types may be installed in situations that are accessible to ordinary persons.