FREE Journeyman Electrician’s NEC 2025 Questions and Answers
Systems that operate at voltages between conductors of ______ volts or more are ungrounded, and this must be clearly indicated at the _____ of the system.
A single phase 120 V, 0.5 HP induction motor's current rating is ____ A.
The current rating of a single-phase 120V, 0.5 HP induction motor is approximately 9.8 amperes. This value is an estimate and may vary slightly based on the specific motor design and efficiency. It's important to refer to the motor's datasheet or nameplate for the most accurate current rating information.
The top and bottom of stairways must have listed wall-mounted control devices if there are ____ or more steps between each floor.
The top and bottom of stairways must have listed wall-mounted control devices if there are six or more steps between each floor. This requirement is in place to provide convenient access to control lighting for safety purposes when navigating stairways. Always refer to local building codes and regulations for specific requirements in your area.
A maximum of _____' between supports is required for type MV cables to be supported.
A maximum of 6 feet between supports is required for type MV (Medium Voltage) cables to be supported. This ensures that the cables are adequately supported and secured to prevent sagging or damage, promoting safety and maintaining the integrity of the installation.
There will be a voltage drop of _______ V in a single phase, 240 V circuit with 3 AWG AI conductors powering a 40 A load 300' away from the power panel.
There will be a voltage drop of approximately 9.67 volts in a single-phase, 240V circuit with 3 AWG aluminum conductors powering a 40A load 300 feet away from the power panel. Voltage drop calculations take into account the resistance of the conductors and the length of the run, among other factors. It's important to note that voltage drop can have an impact on the performance of electrical devices and systems, so it's advisable to keep it within acceptable limits for your specific application.
At _____, secondary tie circuits must feature overcurrent protection.
At both ends, secondary tie circuits must feature overcurrent protection. Secondary tie circuits are used to interconnect two or more secondary distribution systems, and overcurrent protection at both ends helps prevent overloads and short circuits in the event of faults or abnormal conditions in the interconnected systems. This protection ensures the safety and reliability of the electrical distribution.
A supply-side bonding jumper of ____ AWG will be used for a service with 500 kcmil conductors on a 400 A service.
A supply-side bonding jumper of 1/0 AWG will be used for a service with 500 kcmil conductors on a 400 A service. Bonding jumpers are used to ensure proper grounding and bonding of electrical systems, and their size is determined based on various factors, including conductor sizes, ampacity, and the requirements of relevant electrical codes.
The equipment grounding conductor for a heating element protected by a 40 A inverse time circuit breaker must be at least _____ AWG.
The equipment grounding conductor for a heating element protected by a 40 A inverse time circuit breaker must be at least 10 AWG. This conductor size is determined by the requirements for proper grounding and safety in electrical systems. Always follow local electrical codes and regulations when selecting equipment grounding conductors.
The system _____ jumper is fitted at the same location on each individually derived system where the connections for the grounding electrode conductor are established.
The system bonding jumper is fitted at the same location on each individually derived system where the connections for the grounding electrode conductor are established. This bonding jumper helps ensure that the grounding electrode conductor and the system grounding conductor are effectively interconnected to provide proper grounding and bonding for the electrical system.
It is necessary to have at least one or more equipment grounding wires that are ______ AWG on a raceway that includes multiple 15 A circuits.
It is necessary to have at least one or more equipment grounding wires that are 14 AWG on a raceway that includes multiple 15A circuits. This grounding conductor ensures that all circuits within the raceway have a proper path for fault currents to travel in the event of a fault, contributing to electrical safety. Always follow local electrical codes and regulations when designing and installing electrical systems.
On the same load, two power fuses over 1000 V may be connected in parallel as long as the two fuses are Identical.
On the same load, two power fuses over 1000 V may be connected in parallel as long as the two fuses have the same rating. This practice is followed to ensure that the fuses share the load equally and respond consistently to overcurrent conditions. Using fuses with the same rating helps maintain proper protection and prevent uneven distribution of current in parallel paths.
With the exception of ____, all 120 V, single phase, 15 A, and 20 A branch circuits feeding outlets or devices installed in housing units must be AFCI protected.
With the exception of garages, all 120V, single-phase, 15A, and 20A branch circuits feeding outlets or devices installed in housing units must be AFCI (Arc-Fault Circuit Interrupter) protected. AFCI protection is a safety measure designed to detect and mitigate the risk of arc faults that could lead to electrical fires. However, garages are often exempt from this requirement due to the nature of the equipment and activities that may occur in these spaces. Always consult local electrical codes for accurate information on AFCI protection requirements in your jurisdiction.
Any location with ____ is classified as a Class II location.
Any location with combustible dust is classified as a Class II location. Class II hazardous locations are areas where combustible dusts, rather than gases or vapors, create a hazardous environment. Proper precautions and equipment must be used in these locations to prevent potential explosions or fires.
The smallest conductor that can be used for a ground ring is ______ AWG.
The smallest conductor that can be used for a ground ring is 2 AWG. A ground ring is a conductive loop buried around a structure to provide a low-resistance path for fault currents, promoting safety and proper grounding in electrical systems. The size of the conductor used for a ground ring depends on various factors, including the system's design and the local electrical codes.
A single conductor must be at least ____ AWG in size when utilized in power-limited fire alarm circuits.
A single conductor must be at least 18 AWG in size when utilized in power-limited fire alarm circuits. This requirement helps ensure that the conductors used in fire alarm systems meet the appropriate size standards to maintain reliable signaling and communication in case of emergencies.
In any hazardous (classified) location as defined in Articles 500.5, 505.5, and 506.5, the electrical continuity of normally non-current carrying metal parts of electrical equipment, raceways, metal clad cable, and other metal enclosures shall be _______ regardless of the electrical system's voltage.
In any hazardous (classified) location as defined in Articles 500.5, 505.5, and 506.5, the electrical continuity of normally non-current carrying metal parts of electrical equipment, raceways, metal clad cable, and other metal enclosures shall be bonded, regardless of the electrical system's voltage. This bonding requirement ensures the proper grounding and safety of metal components in hazardous locations to prevent the buildup of static charges or the potential for sparking.