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test 2 3rd year books Questions & answers with Complete solutions | Latest edition
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test 2 3rd year books1. The fault current of an arcing short-circuit condition is always (more/less) than the
available fault current value of a bolted short-circuit condition at a specific location due
to the additional resistance of the arc. - ANS-Less
2. OCPD time-current characteristics are commonly represented graphically with the
horizontal axis for _______ in ________ and the vertical axis for ________ in
_________. - ANS-Horizontal=current in amperes
Vertical=time in seconds
3. Sustained overload current results in ____________ conductors and other
___________ (components), which may result in ______________________________
and eventually fire or short-circuit conditions. - ANS-overheating, devices ,deterioration
of insulation
Motor circuit protectors (MCPs) are circuit-breaker related devices that only have an
__________ and are intended only for short-circuit and ground-fault protection for motor
branch circuits. - ANS-instant trip
What are the 2 application-limited OCPDs that are suitable for specific branch-circuit
applications under limited conditions per the NEC? - ANS-High speed fuse and motor
circuit protector
There is a wide range of fault current energy let-through performance for different types
of current-limiting OCPDs. This means that all current-limiting OCPDs (DO/DO NOT)
provide the same level of short-circuit performance. - ANS-Do not
Are all branch-circuit rated OCPDs current-limiting? Even when an OCPD is
current-limiting, there are different degrees of current limitation. If a 600-volt or less
branch-circuit OCPD is current-limiting, it will be marked ___________. If
current-limiting, fuses must be marked as such per NEC __________. - ANS-"current
limiting", per NEC 240.60 C
If the fault current exceeds the capability of the OCPD to interrupt, the OCPD may? -
ANS-violently rupture causing additional damages
1. The characteristic of the operating mechanism in using the handle to open or close a
circuit breaker is referred to as "___________, ___________" in order to prevent the
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