Podcast
Questions and Answers
What does Table 220.12 refer to?
What does Table 220.12 refer to?
Occupancy Lighting Loads
What does Table 220.42 refer to?
What does Table 220.42 refer to?
Lighting Load Demand Factors
What does Table 220.54 refer to?
What does Table 220.54 refer to?
Clothes Dryer Demand Factors
What does Table 220.55 refer to?
What does Table 220.55 refer to?
What does Table 250.66 refer to?
What does Table 250.66 refer to?
What does Table 300.5 refer to?
What does Table 300.5 refer to?
What does Table 314.16(A) refer to?
What does Table 314.16(A) refer to?
What does Table 314.16(B) refer to?
What does Table 314.16(B) refer to?
What does Table 352.44 (A) refer to?
What does Table 352.44 (A) refer to?
All 2" rigid metal conduit shall be supported every ________________ feet.
All 2" rigid metal conduit shall be supported every ________________ feet.
What is the maximum number of conductors allowed in a 4 inch x 1 1/4 inch round metal junction box using #6 AWG conductor size?
What is the maximum number of conductors allowed in a 4 inch x 1 1/4 inch round metal junction box using #6 AWG conductor size?
Electrical load continuing for _____________ or more hours is considered a Continuous Load.
Electrical load continuing for _____________ or more hours is considered a Continuous Load.
What is the minimum size conductor that can be used on a 50 amp circuit?
What is the minimum size conductor that can be used on a 50 amp circuit?
A house with 6000 sq. ft. of living area has a required lighting load of _______ KW.
A house with 6000 sq. ft. of living area has a required lighting load of _______ KW.
A single motor-compressor with a load of 100 amps has an electric circuit conductor that must be sized for ___________ amps.
A single motor-compressor with a load of 100 amps has an electric circuit conductor that must be sized for ___________ amps.
What is the amperes capacity of a 2250 (kcmil) IGS cable?
What is the amperes capacity of a 2250 (kcmil) IGS cable?
Each motion picture projector, floodlight, spotlight, or similar equipment shall have clear working space not less than _______________ millimeters wide.
Each motion picture projector, floodlight, spotlight, or similar equipment shall have clear working space not less than _______________ millimeters wide.
Irrigation cable must be supported at intervals not exceeding ___________ feet.
Irrigation cable must be supported at intervals not exceeding ___________ feet.
The correct AWG size needed for a radio receiving station's antenna conductor made of bronze, with a span length over 150ft, is __________.
The correct AWG size needed for a radio receiving station's antenna conductor made of bronze, with a span length over 150ft, is __________.
The NEC (code book) is prepared by the __________.
The NEC (code book) is prepared by the __________.
According to Code, a bathroom must contain the following: _________.
According to Code, a bathroom must contain the following: _________.
According to Code, 'within sight' means equipment must be within a separated distance of ___________ ft.
According to Code, 'within sight' means equipment must be within a separated distance of ___________ ft.
A volatile, flammable liquid has a __________ classification.
A volatile, flammable liquid has a __________ classification.
Cooling equipment electrical mounting connections must have a minimum conductor size of: ________.
Cooling equipment electrical mounting connections must have a minimum conductor size of: ________.
Overhead spans of open conductors shall have a vertical clearance of not less than ___________ feet above the roof surfaces.
Overhead spans of open conductors shall have a vertical clearance of not less than ___________ feet above the roof surfaces.
The permit period for Christmas decorative lighting installations is limited to ___________ days.
The permit period for Christmas decorative lighting installations is limited to ___________ days.
Armored Cable Type AC cannot be used in ___________ locations.
Armored Cable Type AC cannot be used in ___________ locations.
A 40 horsepower, synchronous-type, 3 phase, alternating-current motor connected to 460 volts has an amperage of __________.
A 40 horsepower, synchronous-type, 3 phase, alternating-current motor connected to 460 volts has an amperage of __________.
The Code letter marking on a polyphase, wound-rotor motor (14HP) is: __________.
The Code letter marking on a polyphase, wound-rotor motor (14HP) is: __________.
Flexible metal conduit shall be securely fastened within ___________ inches of each box.
Flexible metal conduit shall be securely fastened within ___________ inches of each box.
Rigid, non-metallic conduit larger than metric designator 155 may not be used in electrical installations larger than trade size __________.
Rigid, non-metallic conduit larger than metric designator 155 may not be used in electrical installations larger than trade size __________.
The general lighting load by occupancy for Schools is ______________ volt-amperes per square foot.
The general lighting load by occupancy for Schools is ______________ volt-amperes per square foot.
A buried underground service lateral must be placed at a minimum depth of ___________ inches below grade.
A buried underground service lateral must be placed at a minimum depth of ___________ inches below grade.
For a 3-hour fire resistance requirement, the thickness of the concrete floor must be __________ inches.
For a 3-hour fire resistance requirement, the thickness of the concrete floor must be __________ inches.
Propane gas has a hazardous classification of: __________.
Propane gas has a hazardous classification of: __________.
The Demand Factor (percent) for a multifamily building with 100 dwelling units is: __________.
The Demand Factor (percent) for a multifamily building with 100 dwelling units is: __________.
The service disconnecting means for a one-family dwelling shall have a rating of not less than: __________.
The service disconnecting means for a one-family dwelling shall have a rating of not less than: __________.
Fixture wires shall not be smaller than _________ AWG according to Code.
Fixture wires shall not be smaller than _________ AWG according to Code.
Circuit breakers used as switches in 120V and 277V fluorescent lighting circuits shall be marked: '_____________'.
Circuit breakers used as switches in 120V and 277V fluorescent lighting circuits shall be marked: '_____________'.
A grounding electrode rod driven vertically into the ground must be at least __________ feet deep.
A grounding electrode rod driven vertically into the ground must be at least __________ feet deep.
The size of the largest conductor of a service entrance is 4/0 copper; the grounding electrode conductor should be copper size _____________ AWG.
The size of the largest conductor of a service entrance is 4/0 copper; the grounding electrode conductor should be copper size _____________ AWG.
The rating on an Automatic Overcurrent Device ahead of equipment of 1600 amperes requires a copper grounding conductor size of __________ AWG.
The rating on an Automatic Overcurrent Device ahead of equipment of 1600 amperes requires a copper grounding conductor size of __________ AWG.
Exposed live parts on both sides of the workspace require a minimum clear distance of __________ ft.
Exposed live parts on both sides of the workspace require a minimum clear distance of __________ ft.
A Ground Ring encircling a building must be at least _____________ feet of bare copper.
A Ground Ring encircling a building must be at least _____________ feet of bare copper.
Holes bored in wood joists must be ___________ inches from the nearest edge of the wood member.
Holes bored in wood joists must be ___________ inches from the nearest edge of the wood member.
Legally required standby sources of power must be available for ________ seconds.
Legally required standby sources of power must be available for ________ seconds.
Ceiling suspended (paddle) fans within 5 feet of hot tubs must have a mounting height of _______ feet.
Ceiling suspended (paddle) fans within 5 feet of hot tubs must have a mounting height of _______ feet.
Lamps in cellulose nitrate film storage vaults must be controlled by a switch: __________.
Lamps in cellulose nitrate film storage vaults must be controlled by a switch: __________.
Automatic closing fire dampers on transformer vault openings must have a rating of ___________ hours.
Automatic closing fire dampers on transformer vault openings must have a rating of ___________ hours.
Embedded deicing and snow melting equipment cables must be installed on a masonry base at least ____________ inches thick.
Embedded deicing and snow melting equipment cables must be installed on a masonry base at least ____________ inches thick.
A boiler with resistance-type immersion heating elements must have those elements protected at no more than ___________ amperes.
A boiler with resistance-type immersion heating elements must have those elements protected at no more than ___________ amperes.
Color identification on electric space heating cables of 208 volts is: _________.
Color identification on electric space heating cables of 208 volts is: _________.
Resistance-type heating elements in electric space heating equipment are protected at no more than _________ amperes.
Resistance-type heating elements in electric space heating equipment are protected at no more than _________ amperes.
A fixed storage-type water heater that has a capacity of 450L or less shall be considered as a: _________.
A fixed storage-type water heater that has a capacity of 450L or less shall be considered as a: _________.
A metal junction box with dimensions of 3" x 2" x 3-1/2" can hold a maximum of ____________ #12 conductors.
A metal junction box with dimensions of 3" x 2" x 3-1/2" can hold a maximum of ____________ #12 conductors.
The use of metal wireways shall be permitted only for: __________.
The use of metal wireways shall be permitted only for: __________.
PVC Rigid, Nonmetallic conduit exposed to a 100 degree F temperature change will expand by __________ inches.
PVC Rigid, Nonmetallic conduit exposed to a 100 degree F temperature change will expand by __________ inches.
On a 4-wire, delta connected secondary, the phase conductor having the higher voltage to ground shall be identified by an outer finish that is _______________ in color.
On a 4-wire, delta connected secondary, the phase conductor having the higher voltage to ground shall be identified by an outer finish that is _______________ in color.
Conductors over 600 volts crossing over water must have a vertical clearance of ____________ feet.
Conductors over 600 volts crossing over water must have a vertical clearance of ____________ feet.
When a direct burial cable is installed under a street, the cable burial depth must be ___________ inches.
When a direct burial cable is installed under a street, the cable burial depth must be ___________ inches.
Exposed wiring systems in Agricultural Buildings must maintain a _____________ inch air space above the surface.
Exposed wiring systems in Agricultural Buildings must maintain a _____________ inch air space above the surface.
A residential 1000V circuit under an exterior concrete slab must have a minimum cover depth of _____________ millimeters.
A residential 1000V circuit under an exterior concrete slab must have a minimum cover depth of _____________ millimeters.
At least __________ inches of free conductor must extend from outlet/switch boxes.
At least __________ inches of free conductor must extend from outlet/switch boxes.
No parts of cord-connected luminaires shall be located within __________ ft horizontally and ______ ft vertically from the top of a bathtub rim.
No parts of cord-connected luminaires shall be located within __________ ft horizontally and ______ ft vertically from the top of a bathtub rim.
A 100 foot length of conduit with a metric designator of 155 has a trade size of _______________.
A 100 foot length of conduit with a metric designator of 155 has a trade size of _______________.
The residual voltage of a capacitor less than 600 volts must reduce to 50 volts within ____ seconds.
The residual voltage of a capacitor less than 600 volts must reduce to 50 volts within ____ seconds.
In critical care areas of a healthcare facility, each patient bed location must have at least ___________ branch circuits.
In critical care areas of a healthcare facility, each patient bed location must have at least ___________ branch circuits.
Any location where flammable anesthetics are stored is considered a ________ location.
Any location where flammable anesthetics are stored is considered a ________ location.
The allowable ampacity for a #10 AWG size fixture wire is __________.
The allowable ampacity for a #10 AWG size fixture wire is __________.
According to Code, a hoistway is a: __________.
According to Code, a hoistway is a: __________.
An outdoor electrical installation carrying 230,000 nominal voltage must maintain a minimum distance of __________ feet to live parts.
An outdoor electrical installation carrying 230,000 nominal voltage must maintain a minimum distance of __________ feet to live parts.
Study Notes
NEC Tables and Load Factors
- Table 220.12: Details occupancy lighting loads.
- Table 220.42: Provides lighting load demand factors.
- Table 220.54: Outlines demand factors for clothes dryers.
- Table 220.55: Specifies demand factors for electric ranges.
Electrical Grounding and Conductors
- Table 250.66: States grounding electrode conductor sizes based on system requirements.
- Conductors for a 50 amp circuit must use a minimum size as per Code standards.
- The grounding electrode conductor size for a service entrance with a 4/0 copper conductor should also conform to specified regulations.
Code Requirements for Electrical Installations
- Table 300.5: Lists cover requirements for underground installations.
- Table 314.16(A): Defines the size of electric metal boxes.
- Table 314.16(B): Discusses volume allowance per conductor in boxes.
- Electrical equipment in enclosures with exposed parts must maintain minimum clear distance as mandated by Code.
Special Installations and Equipment
- Table 352.44 (A): Addresses expansion considerations for PVC rigid non-metallic (N/M) conduit.
- Overhead spans for open conductors require specific vertical clearance above surfaces for safety.
Demands and Capacity Calculations
- Continuous load is defined as an electrical load persisting for three hours or more.
- Demand factor for multifamily buildings can be calculated based on the number of units.
- A 40-horsepower motor at 460 volts and a power factor of 90% needs a specific amperage calculation.
Safety and Design Considerations
- Motion picture projectors and similar equipment must have a minimum working space width.
- Support requirements for irrigation cables are established with specific intervals.
- Hazard classifications for volatile liquids and gases must be adhered to in installations.
Miscellaneous Code Elements
- Temporary Christmas lighting installations have a permit period limitation.
- Specification on the thickness of concrete elements in contact with earth relates to fire resistance ratings.
- A fixed storage-type water heater’s classification depends on its capacity.
- Specific protection ratings are required for heating elements in various applications to ensure safety compliance.
Studying That Suits You
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Description
Test your knowledge on the National Electrical Code (NEC) with this practice exam featuring flashcards on various tables and definitions. Cover essential topics such as occupancy lighting loads, demand factors for various appliances, and grounding conductors. Perfect for students and professionals aiming to reinforce their understanding of electrical standards.
