scope:

This part of IEC 61439 defines the specific requirements for public electricity network distribution assemblies (PENDAs). PENDAs have the following criteria: - used for the distribution of electrical energy in three phase systems for which the rated voltage does not exceed 1 000 V AC (see Figure 101 for a typical distribution network) and DC systems not exceeding 1500 V DC; - stationary; - open type assemblies are not covered by this document; - 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; - intended for use in energy distribution in public power grids - indoor use: assemblies for installation inside of electric power substations - outdoor use: assemblies containing an enclosure suitable for open air installation The object of this document 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. PENDAs may also include control and or signalling devices associated with the distribution of electrical energy.