Transcription of protection devices - Legrand
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protection devices - Legrand
Sizing conductors and selecting protection devicesPowEr guidE 2009 / BOOk 0404 Careful selection of the sizes of the conductors in wiring systems and the characteristics of protection devices will ensure basic protection of the installation:- protection against overloads- Limitation of voltage drops- protection against short -circuits- Checking of the thermal stresses- protection against indirect contactCareful selection of the sizes of the conductors in wiring systems and the characteristics of protection devices will ensure basic protection of the installation:- protection against overloads- Limitation of voltage drops- protection against short -circuits- Checking of the thermal stresses- protection against indirect contactINTrOThe complete calculation of installations has been found to be so long, complex, and even daunting as to justify the ongoing development of practical aids: calculation charts, note-boards, etc.
A short-circuit is an overcurrent produced by a minor impedance fault between conductors with different potentials It is accidental and can be due to clumsiness (dropping a tool, cutting a cable) or an equipment defect Protection devices must be provided to limit and break the short-circuit currents before their thermal
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