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Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that is available at the line terminals of the equipment.
Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that must be interrupted.

Related Code Sections

110.9 General, Interrupting Rating
Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current ...
110.9 General, Interrupting Rating
Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current ...
(C) Wiring and Protection, Interrupting Rating
Every circuit breaker having an interrupting rating other than 5000 amperes shall have its interrupting rating shown on the circuit breaker. The ...
(C) Wiring and Protection, Interrupting Rating
Every circuit breaker having an interrupting rating other than 5000 amperes shall have its interrupting rating shown on the circuit breaker. The ...
(2) Equipment for General Use, Interrupting Rating
The interrupting rating of power fuses shall not be less than the maximum fault current the fuse is required to interrupt, including contributions ...