View source for Switchgear selection

{{Menu_LV_switchgear_functions_and_selection}}

Software is being used more and more in the field of optimal selection of switchgear. Each circuit is considered one at a time, and a list is drawn up of the required protection functions and exploitation of the installation, among those mentioned in {{FigureRef|H22}} and summarized in {{FigureRef|H1}}.

A number of switchgear combinations are studied and compared with each other against relevant criteria, with the aim of achieving: 

*Satisfactory performance 
*Compatibility among the individual items; from the rated current In to the fault-level rating Icu 
*Compatibility with upstream switchgear or taking into account its contribution 
*Conformity with all regulations and specifications concerning safe and reliable circuit performance

In order to determine the number of poles for an item of switchgear, reference is made to chapter [[Sizing and protection of conductors]]. Multifunction switchgear, initially more costly, reduces installation costs and problems of installation or exploitation. It is often found that such switchgear provides the best solution.

[[ru:Выбор коммутационной аппаратуры]]
[[zh:开关设备选择]]