Codeology 6 Lesson 8 questions and answers
Graded A+
? is a system intended to provide protection of equipment from damaging line-to-ground fault
currents by operating to cause a disconnecting means to open all ungrounded conductors of
the faulted circuit. - ✅✅c. Ground-fault protection of equipment
NEC Reference: 100
For most circuits, phase OCPDs provide protection for all types of short-circuit conditions,
including ground faults. - ✅✅True
A typical ground-fault relay has an adjustable ground-fault current pick-up setting and time-
delay pick-up setting. - ✅✅True
Ground faults on large ampere services, such as 3,000 amperes, are always of the magnitude
that the phase OCPD provides suitable protection against ground faults. - ✅✅False
Large ampere rated service-entrance overcurrent protective devices may not always sense and
open lower-level ground-fault conditions prior to extensive damage. - ✅✅True
The ground-fault protection provisions of 230.95 ? apply to a service disconnect for a
continuous industrial process where a nonorderly shutdown will introduce additional or
increased hazards. - ✅✅B. Shall Not
NEC Reference: 230.95 Exception
The ground-fault protection system must operate to cause the service disconnect to open all
ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault
protection permitted is ? , and the maximum time-delay setting is ? for ground-fault currents
equal to or greater than 3,000 amperes. - ✅✅d. 1,200 A / 1 second
Graded A+
? is a system intended to provide protection of equipment from damaging line-to-ground fault
currents by operating to cause a disconnecting means to open all ungrounded conductors of
the faulted circuit. - ✅✅c. Ground-fault protection of equipment
NEC Reference: 100
For most circuits, phase OCPDs provide protection for all types of short-circuit conditions,
including ground faults. - ✅✅True
A typical ground-fault relay has an adjustable ground-fault current pick-up setting and time-
delay pick-up setting. - ✅✅True
Ground faults on large ampere services, such as 3,000 amperes, are always of the magnitude
that the phase OCPD provides suitable protection against ground faults. - ✅✅False
Large ampere rated service-entrance overcurrent protective devices may not always sense and
open lower-level ground-fault conditions prior to extensive damage. - ✅✅True
The ground-fault protection provisions of 230.95 ? apply to a service disconnect for a
continuous industrial process where a nonorderly shutdown will introduce additional or
increased hazards. - ✅✅B. Shall Not
NEC Reference: 230.95 Exception
The ground-fault protection system must operate to cause the service disconnect to open all
ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault
protection permitted is ? , and the maximum time-delay setting is ? for ground-fault currents
equal to or greater than 3,000 amperes. - ✅✅d. 1,200 A / 1 second
