GB 7251.3-2006 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
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
The content below replaces the note:
This part stipulates the supplementary requirements for close type distributing board. This distributing board is with the protective devices. Internal fixed installation type-tested assemblies (TTA) are suitable for civil use (domestic) or to be used by non-professionals in the field. Distributing board can also include controlgear and /or signaling device. They are used for AC and the nominal voltage to earth it no less than 300V. If input total load current is less than 250 A, rated current included in short circuit protector of output circuit is not less than 125A.
Note: nominal voltage to earth of IT system can be the nominal voltage if this system.
Under normal conditions, non-professionals can approach this type of equipment, for example, operating the switch or replace molten wire.
