SNV - SN EN 60439-3
Low-voltage switchgear and controlgear assemblies. Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use - Distribution boards
| Organization: | SNV |
| Publication Date: | 1 January 1991 |
| Status: | active |
| Page Count: | 18 |
scope:
Replace the second note by:
This standard gives supplementary requirements tor such enclosed distribution boards (DBU), which are stationary, type tested assemblies (TTA) tor indoor use, containing protective devices and intended tor use either in domestic (household) applications or in other places where unskilled persons have access tor their use. Control and/or signaling devices may also be included. They are tor use on a.c., with a nominal voltage to earth not exceeding 300 V. The outgoing circuits contain short-circuit protective devices, each having a rated current not exceeding 125 A with a total incoming bad current not exceeding 250 A.
NOTE - The nominal voltage to earth in an lT system is taken as the nominal voltage of the system.
Unskilled persons normally have access to these assemblies, e.g. tor switching operations and tor replacing fuse-links.
Requirements tor assemblies for outdoor use are under consideration.
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