Exam (elaborations)
COMMERCIAL WIRING FINAL EXAM QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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COMMERCIAL WIRING FINAL EXAM QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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COMMERCIAL WIRING FINAL EXAMQUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
Too many devices on one circuit could cause a type of overcurrent known as ______________ - ANSWER
overload
A(n) ______________ occurs when there is a low-resistance path between conductors - ANSWER short
circuit
A(n) ___________ is a short between a hot conductor and a grounding path - ANSWER ground fault
According to the Code, overcurrent protection devices must be ____________ - ANSWER Readily
accessible and installed in a closure. Both A and B
Overcurrent protective devices are rated for _____________ - ANSWER amps and volts. Both A and B
The highest fault current an OCPD is designed to handle is the device's ______________ rating -
ANSWER interrupt
The two general types of fuses are plug and ______________ - ANSWER cartridge
A single-element fuse link(s) will melt in response to _________________ - ANSWER overload current
Time-delay fuses allow for___________ - ANSWER momentary overloads
Edison-based fuses are ____________ - ANSWER interchangeable
Circuit breakers can be operated _______________ - ANSWER electrically,manually,pneumatically. All of
the above
, An inverse-time circuit breaker allows as much as __________ times the overload current before
opening the circuit - ANSWER 10
The NEC _____________ rule allows a feeder conductor of smaller ampacity to be tapped without
overcurrent protection at the tap. - ANSWER 10-foot tap
All electrical circuits are required to protect against overcurrent. - ANSWER True
Typically, branch circuit overcurrent devices are located in the power panel. - ANSWER True
Circuit breakers have to be replaced after they detect an overcurrent - ANSWER False
The ampere rating of an overcurrent protection device is usually the same as the current-carrying
capacity of the circuit conductor - ANSWER True
The fusible link can be replaced in renewable fuses - ANSWER True
Cartridge fuses are used in circuits over 120 volts or over 30 amps - ANSWER True
Single-element fuses are designed for circuits with transient surge currents. - ANSWER False
Type S fuses must be used on all new installations and for replacement installations. - ANSWER True
The voltage rating of a fuse should never be lower than the circuit rating - ANSWER True
Circuit breakers are NOT permitted to serve as a disconnecting switch - ANSWER False
The conductors extending from the utility pole to the facilities equipment are called the ___________ -
ANSWER service
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