Which of the following is not a reason why short-circuit calculations are necessary for electrical systems?
a.They are needed to analyze OCPDs for selective coordination.
b.They are needed to determine the standard ampere rating of the OCPD.
c.They are needed to ensure that OCPDs and components/equipment of a distribution system have adequate interrupting ratings and short-circuit current ratings.
d.Service equipment is required to be marked with the available fault current.
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The correct answer is: They are needed to determine the standard ampere rating of the OCPD.