NCCER 26305 ACTUAL TEST PAPER TESTED
QUESTIONS AND VERIFIED CORRECT
ANSWERS REVIEW RESOURCE
⩥ Overload current is confined to the normal conductive path provided
by the conductors, circuit devices, and loads of the distribution system.
Answer: True
⩥ Fault current ? the normal conducting path.
Answer: flows outside
⩥ Because of the ? impedance path, a 3-phase bolted short-circuit
condition is typically assumed to be the highest level of fault current.
Answer: low
⩥ Which one of the following statements is NOT correct per the Article
100 definition of branch-circuit overcurrent protective device?
Answer: Branch-circuit overcurrent protective devices must be listed in
combination with the specific devices they are intended to protect.
⩥ Supplementary overcurrent protective devices are permitted to be
used as a substitute for a branch-circuit OCPD or where a branch-circuit
OCPD is required (per 240.10).
,Answer: False
⩥ A ? overcurrent protective device is one that clears a fault current in
one half cycle or less and reduces the amount of fault current let-
through.
Answer: current-limiting
⩥ When fault current is within the current-limiting range of a current-
limiting OCPD, the thermal energy and magnetic (mechanical) forces
can be greatly reduced. The levels of both thermal energy and magnetic
forces are proportional to the square of the fault current that flows.
Answer: True
⩥ A 600-volt or less branch-circuit OCPD can be identified as being
current limiting by being marked "current limiting."
Answer: True
⩥ The voltage rating of the OCPD must be equal to but never greater
than the circuit voltage.
Answer: False
⩥ A 600-volt AC fuse or circuit breaker is considered to have a 600-volt
DC rating, even if it is not marked with a DC voltage rating.
Answer: False
,⩥ A 480/277-volt, 3-pole circuit breaker can be applied on a 480-volt
corner-grounded delta.
Answer: False
240.85
⩥ Branch-circuit fuses do not have to be marked with their ampere
rating.
Answer: False
Note: NEC 240.60(C) requires fuses to be marked with their ampere
rating, and 240.83(A) requires circuit breakers to be marked with their
ampere rating.
⩥ Only standard ampere rated fuses and circuit breakers found in 240.6
are permitted to be used in services, feeders, and branch circuits.
Answer: False
Note: NEC 240.6(A) permits the use of nonstandard ampere ratings.
⩥ When the conductor ampacity does not correspond to a standard
OCPD ampere rating, the next standard OCPD ampere rating is
permitted if that rating does not exceed 800 amperes, and if the
conductors are not supplying a circuit with more than one receptacle for
cord-and-plug portable loads.
Answer: True
, ⩥ For motor branch-circuit applications, the motor branch-circuit short-
circuit and ground-fault protective device can be located anywhere on
the motor branch circuit since fault currents stay within the normal
conducting path.
Answer: False
⩥ Molded case circuit breakers, insulated case circuit breakers, and low-
voltage power circuit breakers are ? .
Answer: branch-circuit overcurrent protective devices
⩥ MCPs are recognized devices (not listed) and are permitted by ? to
provide motor branch-circuit short-circuit and ground-fault protection, if
used as part of a listed combination with a starter.
Answer: 430.52(C)(3)
⩥ Which statement about supplementary protectors is not correct?
Answer: They are suitable for branch-circuit protection
⩥ Molded case circuit breakers (MCCBs) are the most prevalent circuit
breakers in use for 15 amperes to 2,500 amperes.
Answer: True
QUESTIONS AND VERIFIED CORRECT
ANSWERS REVIEW RESOURCE
⩥ Overload current is confined to the normal conductive path provided
by the conductors, circuit devices, and loads of the distribution system.
Answer: True
⩥ Fault current ? the normal conducting path.
Answer: flows outside
⩥ Because of the ? impedance path, a 3-phase bolted short-circuit
condition is typically assumed to be the highest level of fault current.
Answer: low
⩥ Which one of the following statements is NOT correct per the Article
100 definition of branch-circuit overcurrent protective device?
Answer: Branch-circuit overcurrent protective devices must be listed in
combination with the specific devices they are intended to protect.
⩥ Supplementary overcurrent protective devices are permitted to be
used as a substitute for a branch-circuit OCPD or where a branch-circuit
OCPD is required (per 240.10).
,Answer: False
⩥ A ? overcurrent protective device is one that clears a fault current in
one half cycle or less and reduces the amount of fault current let-
through.
Answer: current-limiting
⩥ When fault current is within the current-limiting range of a current-
limiting OCPD, the thermal energy and magnetic (mechanical) forces
can be greatly reduced. The levels of both thermal energy and magnetic
forces are proportional to the square of the fault current that flows.
Answer: True
⩥ A 600-volt or less branch-circuit OCPD can be identified as being
current limiting by being marked "current limiting."
Answer: True
⩥ The voltage rating of the OCPD must be equal to but never greater
than the circuit voltage.
Answer: False
⩥ A 600-volt AC fuse or circuit breaker is considered to have a 600-volt
DC rating, even if it is not marked with a DC voltage rating.
Answer: False
,⩥ A 480/277-volt, 3-pole circuit breaker can be applied on a 480-volt
corner-grounded delta.
Answer: False
240.85
⩥ Branch-circuit fuses do not have to be marked with their ampere
rating.
Answer: False
Note: NEC 240.60(C) requires fuses to be marked with their ampere
rating, and 240.83(A) requires circuit breakers to be marked with their
ampere rating.
⩥ Only standard ampere rated fuses and circuit breakers found in 240.6
are permitted to be used in services, feeders, and branch circuits.
Answer: False
Note: NEC 240.6(A) permits the use of nonstandard ampere ratings.
⩥ When the conductor ampacity does not correspond to a standard
OCPD ampere rating, the next standard OCPD ampere rating is
permitted if that rating does not exceed 800 amperes, and if the
conductors are not supplying a circuit with more than one receptacle for
cord-and-plug portable loads.
Answer: True
, ⩥ For motor branch-circuit applications, the motor branch-circuit short-
circuit and ground-fault protective device can be located anywhere on
the motor branch circuit since fault currents stay within the normal
conducting path.
Answer: False
⩥ Molded case circuit breakers, insulated case circuit breakers, and low-
voltage power circuit breakers are ? .
Answer: branch-circuit overcurrent protective devices
⩥ MCPs are recognized devices (not listed) and are permitted by ? to
provide motor branch-circuit short-circuit and ground-fault protection, if
used as part of a listed combination with a starter.
Answer: 430.52(C)(3)
⩥ Which statement about supplementary protectors is not correct?
Answer: They are suitable for branch-circuit protection
⩥ Molded case circuit breakers (MCCBs) are the most prevalent circuit
breakers in use for 15 amperes to 2,500 amperes.
Answer: True
