Article 240 -Overcurrent Protection Questions and Solutions | Grade A+
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Course
Article 240
Institution
Article 240
Overcurrent protection for conductors and equipment is provided to _____ the circuit if the
current reaches a value that will cause an excessive or dangerous temperature in conductors
or conductor insulation.
️: open
A device that, when interrupting currents in its current-limiting range, r...
Article 240 -Overcurrent Protection
Questions and Solutions | Grade A+
Overcurrent protection for conductors and equipment is provided to _____ the circuit if the
current reaches a value that will cause an excessive or dangerous temperature in conductors
or conductor insulation.
✔️: open
A device that, when interrupting currents in its current-limiting range, reduces the current
flowing in the faulted circuit to a magnitude substantially less than that obtainable in the
same circuit if the device were replaced with a solid conductor having comparable
impedance, is a(an) "_____ protective device."
✔️: current-limiting overcurrent
A conductor, other than a service conductor, that has overcurrent protection ahead of its point
of supply that exceeds the ampacity permitted for similar conductors is known as a _____.
✔️: tap conductor
, Conductor overload protection shall not be required where the interruption of the _____
would create a hazard, such as in a material-handling magnet circuit or fire pump circuit.
However, short-circuit protection is required.
✔️: circuit
The next higher standard rating overcurrent device above the ampacity of the ungrounded
conductors being protected shall be permitted to be used, provided the _____.
✔️: conductors being protected are not part of a branch circuit supplying more than one
receptacle for cord-and-plug-connected portable loads, ampacity of the conductors does not
correspond with the standard ampere rating of a fuse or circuit breaker, and next higher
standard rating selected does not exceed 800A
If the circuit\'s overcurrent device exceeds _____, the conductor ampacity shall have a rating
not less than the rating of the overcurrent device.
✔️: 800A
Overcurrent protection shall not exceed _____.
✔️: 15A for 14 AWG copper, 20A for 12 AWG copper, and 30A for 10 AWG copper
The standard ampere ratings for fuses include(s) _____.
✔️: 1A, 6A, and 601A
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