during the design stage of an electrical installation why do i need to know prospective earth fault current?

Question by spiderb: during the design stage of an electrical installation why do i need to know prospective earth fault current?

Best answer:

Answer by Jeremy D
You would need to know the available fault current of the system in order to properly rate the electrical components. Most all types of electrical switchgear have a fault current interrupting capacity rating. All components must have an interrupting capacity of at least as high as the available fault current.

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