TAILIEUCHUNG - Distribution in low-voltage installations (MLVS)

Distribution switchboards, including the main LV switchboard (MLVS), are critical to the dependability of an electrical installation. They must comply with well-defined standards governing the design and construction of LV switchgear assemblies | E - Distribution in low-voltage installations 2 The installation system I T Distribution switchboards including the main LV switchboard MLVS are critical to the dependability of an electrical installation. They must comply with well-defined standards governing the design and construction of LV switchgear assemblies The load requirements dictate the type of distribution switchboard to be installed Distribution switchboards A distribution switchboard is the point at which an incoming-power supply divides into separate circuits each of which is controlled and protected by the fuses or switchgear of the switchboard. A distribution switchboard is divided into a number of functional units each comprising all the electrical and mechanical elements that contribute to the fulfilment of a given function. It represents a key link in the dependability chain. Consequently the type of distribution switchboard must be perfectly adapted to its application. Its design and construction must comply with applicable standards and working practises. The distribution switchboard enclosure provides dual protection Protection of switchgear indicating instruments relays fusegear etc. against mechanical impacts vibrations and other external influences likely to interfere with operational integrity EMI dust moisture vermin etc. The protection of human life against the possibility of direct and indirect electric shock see degree of protection IP and the IK index in section of Chapter E . Types of distribution switchboards Distribution switchboards may differ according to the kind of application and the design principle adopted notably in the arrangement of the busbars . Distribution switchboards according to specific applications The principal types of distribution switchboards are The main LV switchboard - MLVS - see Fig. E27a Motor control centres - MCC - see Fig. E27b Sub-distribution switchboards see Fig. E28 Final distribution switchboards see Fig. E29 Distribution switchboards .

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