Questions and Answers
Where the outer sheath of Type MI cable is made of steel, what should be provided?
The interior of enclosures or raceways installed underground shall be considered to be a _________ location.
The continuity of the equipment grounding conductor system used for portable electrical carnival equipment shall be verified ______________.
A plate-type grounding electrode shall be installed below the surface of the earth NOT less than ________.
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What is the MAXIMUM allowable ampacity of size 1/0 AWG THW copper current-carrying conductors with an ambient temperature of 86°F?
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In class II, Division 1, hazardous locations, what is the maximum length for the RMC term when pendant mounted luminaires are suspended without flexibility?
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What is the MINIMUM size THW copper branch-circuit conductors required by the NEC to supply a 3-phase, continuous-duty, AC motor with a full-load current of 70 amperes?
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Given a conductor with a computed allowable ampacity of 75 amperes, what is the MAXIMUM overcurrent protection device rating permitted to protect this circuit?
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A 208-volt, 3-phase, 50 hp, squirrel-cage, continuous-duty AC motor has a full-load running current of _________?
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Luminaires installed under metal-corrugated sheet roofing decking shall be installed so there is NOT less than ________ clearance from the roof.
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What is the MINIMUM trade size electrical metallic tubing (EMT) required to enclose eight (8) size 6 AWG copper conductors with THHW insulation?
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When feeder conductors of not over 600 volts supply a continuous load of 240 amperes, what is the MINIMUM rating of the overcurrent protection device?
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Liquid tight flexible metal conduit (LFMC) shall be securely fastened within at LEAST ________ of each box or other conduit termination.
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When a pull box contains conductors of size 4 AWG and larger, what must the length of the box be?
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Which wiring method listed is NOT permitted for use as a feeder for temporary wiring on a construction site?
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What is the MAXIMUM number of size 14 AWG THHN conductors allowed in a trade size 3/8-inch flexible metal conduit that contains a grounding conductor?
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For calculating the general lighting load in a dwelling unit, which location should be excluded?
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Electrical equipment located in non-dwelling units requires a warning for qualified persons regarding __________.
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Which listed type of battery is NOT permitted for use as a source of power for emergency systems?
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What is the MINIMUM rating for a service disconnecting means for a building with three, two-wire circuits?
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In guest rooms of hotels and motels, how many general purpose receptacles must be readily accessible?
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When branch-circuit conductors supplying a luminaire are contained inside a ballast compartment, what should their temperature rating be if they are within 3 inches of the ballast?
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When a size 4 AWG or larger insulated conductor enters a panel board, what must be provided?
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Class ________ locations are hazardous because of ignitable fibers or combustible flyings.
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Receptacles supplying power to freestanding-type office furnishings shall be located NOT more than _______ from the furnishing.
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Study Notes
Type MI Cable Grounding
- Steel outer sheath of Type MI cable requires a separate equipment grounding conductor to be provided.
Underground Enclosures
- Enclosures or raceways installed underground are considered wet locations.
Equipment Grounding Verification
- Continuity of the equipment grounding conductor system for portable carnival equipment must be verified each time the equipment is connected.
Grounding Electrode Depth
- A plate-type grounding electrode must be installed at a depth of no less than 30 inches below the surface.
Ampacity of Conductors
- Maximum allowable ampacity for size 1/0 AWG THW copper current-carrying conductors at 86°F is 120 amperes.
Rigid Metal Conduit Length
- In Class II, Division 1 hazardous locations, pendant mounted luminaries using rigid metal conduit (RMC) should not exceed a length of 12 inches without means for flexibility.
THW Copper Conductors for Motors
- Minimum size THW copper branch-circuit conductors for a 3-phase, continuous-duty AC motor with a 70 amp full-load current is 3 AWG.
Overcurrent Protection Rating
- Maximum standard ampere rating for overcurrent protection device with a computed allowable ampacity of 75 amperes is 80 amperes.
Full-Load Current for AC Motors
- A 208-volt, 3-phase, 50 hp squirrel-cage, continuous-duty AC motor has a full-load running current of 143 amperes.
Luminaire Installation Clearance
- Luminaires under metal-corrugated roofing must have a minimum clearance of 1 1/2 inches from the roof decking.
EMT Sizing
- Minimum trade size electrical metallic tubing (EMT) for enclosing eight size 6 AWG copper conductors is 1 1/4 inches.
Feeder Conductors Protection
- Minimum rating for overcurrent protection device supplying a continuous load of 240 amperes is 300 amperes.
Flexible Metal Conduit Requirements
- Liquid tight flexible metal conduit (LFMC) must be securely fastened within at least 12 inches of each box or conduit termination.
Pull Box Dimensions
- Pull boxes containing conductors of size 4 AWG and larger should be at least eight times the trade diameter of the largest conduit entering.
Temporary Wiring Method Restrictions
- Type PD cord is not permitted as a feeder for temporary wiring on construction sites.
Conductors in Flexible Metal Conduit
- Maximum number of size 14 AWG THHN conductors allowed in a 3/8-inch FMC with a bare grounding conductor is four.
General Lighting Load Calculations
- When calculating general lighting load for dwellings, an open porch not adaptable for future use is excluded.
Electrical Equipment Marking
- Electrical equipment that requires examination or servicing while energized must be marked for potential arc flash hazards.
Emergency Power Battery Types
- Automotive batteries are not permitted as power sources for emergency systems.
Service Disconnect Rating
- Minimum service disconnecting means rating for buildings other than one-family dwellings with three two-wire circuits is 60 amperes.
Guest Room Receptacles
- Hotels and dormitories must have at least two general purpose receptacles that are readily accessible in guest rooms or suites.
Conductors Inside Ballast Compartments
- Conductors within 3 inches of a ballast must have a temperature rating of at least 90°C.
Conductor Entry Requirements
- An insulated bushing is required when size 4 AWG or larger insulated conductor enters a panel board or cabinet.
Hazardous Class III Locations
- Class III locations are hazardous due to the presence of easily ignitable fibers or combustible flyings.
Office Furnishing Receptacle Locations
- Receptacles for freestanding office furnishings must be located no more than 1 foot from the connected furnishing.
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Test your knowledge with this set of flashcards designed for the Journeyman Electrician practice exam #7. Each card includes key concepts and questions related to electrical codes and practices. Perfect for reviewing and reinforcing your expertise in electrical systems.
