DIN EN 61439-3:2013-02

This part of IEC 61439 defines the specific requirements for distribution boards intended to be operated by ordinary persons (DBOs). It has been transferred into the newly structured series IEC 61439 for low-voltage switchgear and controlgear assemblies and adapted to Part IEC 61439-1 containing the general rules. DBOs have the following criteria: - intended to be operated by ordinary persons (for example, switching operations and replacing fuse-links), for instance, in domestic (household) applications; - outgoing circuits contain protective devices, intended to be operated by ordinary persons, complying, for example, with IEC 60898-1, IEC 61008, IEC 61009, IEC 62423 and IEC 60269-3; - rated voltage to earth does not exceed 300 V a.c.; - rated current (I_nc) of the outgoing circuits does not exceed 125 A and the rated current (I_nA) of the DBO does not exceed 250 A; - intended for the distribution of electrical energy; - enclosed, stationary; - for indoor or outdoor use. The responsible committee is Subcommittee DKE/UK 431.1 "Niederspannungs-Schaltgerätekombinationen" ("Low-voltage switchgear and controlgear assemblies") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.