What is expected by Fault Level Rating given to electrical equipment?
I think that you may be asking about the prospective short circuit current, Every supply nouns point has a theoretical maximum current that it can supply into a short circuit. That rating begin with the supply voltage divided by the internal impedance of the source. It is modified by the use of current limiting fuses or other short circuit protection that is provided surrounded by the distribution system. If a short circuit occurs inside a piece of electrical equipment or on the load side of the equipment, within may be a danger of fire, explosion, or arc flash if the impedance of the source and the short circuit protection does not prevent the momentary fault current from exceeding a given plane before the fault is cleared. The reprimand level rating would be a way of expressing the stratum to which the fault current must be limited.