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What does "Concealed" applied to electrical wiring mean?

For example, cables or raceways installed within, say, drywalled partition are not accessible without damaging the finished wall and are considered to be concealed. Wires in concealed raceways are considered concealed, even though they may become accessible by withdrawing them NEC Article 100.\n - [NEC Section ](): ""

For example, cables or raceways installed within, say, drywalled partition are not accessible without damaging the finished wall and are considered to be concealed. Wires in concealed raceways are considered concealed, even though they may become accessible by withdrawing them NEC Article 100.

What is a feeder?

A circuit conductor between the final overcurrent device protecting the circuit and the outlet. All circuit conductors between the service equipment; the source of a separately derived system; other power supply source and the final branch-circuit overcurrent device. NEC Article 100 Definitions.\n - [NEC Section ](): ""

A circuit conductor between the final overcurrent device protecting the circuit and the outlet. All circuit conductors between the service equipment; the source of a separately derived system; other power supply source and the final branch-circuit overcurrent device. NEC Article 100 Definitions.

What is a bonding conductor or jumper?

A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected\n - [NEC Section ](): ""

A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected

What must be provided in locations where electric equipment would be exposed to physical damage?

Working space\n - [NEC Section ](): ""

Working space

What is required to provide access to the working space in an electrical equipment room?

For example, an electrical equipment room in an office building would require only one entrance door to the room. This entrance shall be capable of giving access to and egress from the working space: NEC Section 110.26_(C)(1).\n - [NEC Section ](): ""

For example, an electrical equipment room in an office building would require only one entrance door to the room. This entrance shall be capable of giving access to and egress from the working space: NEC Section 110.26_(C)(1).

What does 'externally operable' mean?

NEC Article 100 _ Definitions: See Figure 1-4.\n - [NEC Section ](): ""

NEC Article 100 _ Definitions: See Figure 1-4.

What must be provided for in all working spaces above service equipment?

A light fixture must be installed for the working spaces about any switchboards, panelboards, etc. Adequate illumination (light) will be available for operation and repairs. Such lighting shall not be controlled by automatic means only: NEC Section 110.26 (D).\n - [NEC Section ](): ""

A light fixture must be installed for the working spaces about any switchboards, panelboards, etc. Adequate illumination (light) will be available for operation and repairs. Such lighting shall not be controlled by automatic means only: NEC Section 110.26 (D).

What must molten metal be enclosed or separated and isolated from in electrical systems?

All combustible material. NEC Section 110.18. Special rules apply for motors (430.14) and hazardous locations (Articles 500 through 517).\n - [NEC Section ](): ""

All combustible material. NEC Section 110.18. Special rules apply for motors (430.14) and hazardous locations (Articles 500 through 517).

What should working space in rooms containing electrical equipment not be used for?

Storage. The area around electrical equipment must be kept clear of foreign matter so that maintenance and repairs may be readily made. NEC Section 110.26 (B)\n - [NEC Section ](): ""

Storage. The area around electrical equipment must be kept clear of foreign matter so that maintenance and repairs may be readily made. NEC Section 110.26 (B)

In cases where there are live parts normally exposed on the front of switchboards or motor control centers, what is the minimum working space required in front of such equipment?

Three feet is judged by the NEC to be adequate space (600 volts or under) that workers may keep a safe distance from live electrical parts. NEC Table 110.26_(A)(1).\n - [NEC Section ](): ""

Three feet is judged by the NEC to be adequate space (600 volts or under) that workers may keep a safe distance from live electrical parts. NEC Table 110.26_(A)(1).

What is the definition of Ampacity?

The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. NEC Article 100 Definitions.\n - [NEC Section ](): ""

The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. NEC Article 100 Definitions.

What does 'Approved' mean in the NEC?

In most cases, the local city, county, or state electrical inspector is the authority having jurisdiction. NEC Article 100 Definitions.\n - [NEC Section ](): ""

In most cases, the local city, county, or state electrical inspector is the authority having jurisdiction. NEC Article 100 Definitions.

What is a bare conductor?

A bare conductor, such as a service grounding wire, has no cover or insulation. NEC Article 100 Definitions, Conductor; Bare.\n - [NEC Section ](): ""

A bare conductor, such as a service grounding wire, has no cover or insulation. NEC Article 100 Definitions, Conductor; Bare.

Which anchors may not be used to secure electrical equipment to masonry walls?

NEC Section 110.13_(A).\n - [NEC Section ](): ""

NEC Section 110.13_(A).

What is a device called that is designed to open and close a circuit by nonautomatic means and to open the predetermined circuit automatically on overcurrent without damage to itself?

Nonfusible disconnect switch\n - [NEC Section ](): ""

Nonfusible disconnect switch

What is a conductor encased within material of composition or thickness that is recognized by the NEC as electrical insulation known as?

An insulated conductor\n - [NEC Section ](): ""

An insulated conductor

What is defined as a separate portion of a conduit or tubing system that provides access through a removable terminal point of the system?

NEC Article 100 defines it as a Conduit body. See Figure 1-8.\n - [NEC Section ](): ""

NEC Article 100 defines it as a Conduit body. See Figure 1-8.

What device is now required to detect and protect against arcing in 15- and 20-amp branch circuits supplying outlets installed in dwelling units?

Outlets installed in dwelling unit family rooms, dining rooms, living rooms, or areas shall be protected by a listed arc-fault circuit interrupter; combination-type. NEC Section 210-12_(A). The definition of arc-fault circuit interrupter has been added to Article 100- Definitions.\n - [NEC Section 210](https://2023.antflix.net#210): "No body text available"

Outlets installed in dwelling unit family rooms, dining rooms, living rooms, or areas shall be protected by a listed arc-fault circuit interrupter; combination-type. NEC Section 210-12_(A). The definition of arc-fault circuit interrupter has been added to Article 100- Definitions.

Which circuits must not be connected to any system containing trolley wires with a ground return?

No other live or ungrounded conductors may be connected except those specifically designed for trolley operation NEC Section 110.19.\n - [NEC Section ](): ""

No other live or ungrounded conductors may be connected except those specifically designed for trolley operation NEC Section 110.19.

What is the minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers?

The NEC judges 6' feet working space, or the height of the equipment, to be adequate above service equipment to provide room for an electrician to service the equipment. This measurement is taken from the floor to ceiling of an electrical equipment room, not from the top of the panelboard. NEC Section 110.26(4)(3).\n - [NEC Section ](): ""

The NEC judges 6' feet working space, or the height of the equipment, to be adequate above service equipment to provide room for an electrician to service the equipment. This measurement is taken from the floor to ceiling of an electrical equipment room, not from the top of the panelboard. NEC Section 110.26(4)(3).

What must indoor electrical installations over 600 volts that are open to unqualified persons be made with?

Equipment shall be metal-enclosed, or in an area to which access is controlled by a lock: NEC Section 110.31_(B)(1).\n - [NEC Section ](): ""

Equipment shall be metal-enclosed, or in an area to which access is controlled by a lock: NEC Section 110.31_(B)(1).

What is the minimum size requirement for the entrance provided to give access to the working space about electric equipment rated over 600 volts?

Additionally; door(s) shall open in the direction of egress and be equipped with panic bars, pressure plates, or other devices that are normally latched but open under simple pressure. NEC Section 110.33_(A).\n - [NEC Section ](): ""

Additionally; door(s) shall open in the direction of egress and be equipped with panic bars, pressure plates, or other devices that are normally latched but open under simple pressure. NEC Section 110.33_(A).

How should high-voltage equipment be separated from the space occupied by low-voltage equipment when switches or other equipment operating at 600 volts or less are installed in wiring operating at over 600 volts?

A partition to prevent contact between the two systems must be installed. NEC Section 110.34_(B).\n - [NEC Section ](): ""

A partition to prevent contact between the two systems must be installed. NEC Section 110.34_(B).

What is an enclosed channel designed expressly for holding wires, cables, or busbars called?

A raceway may be conduit or piping, auxiliary wire troughs (gutters), busducts, wire trays, etc. NEC Definitions.\n - [NEC Section ](): ""

A raceway may be conduit or piping, auxiliary wire troughs (gutters), busducts, wire trays, etc. NEC Definitions.

What is a contact device installed at an outlet for the connection of an attachment plug called?

NEC Article 100 Definitions.\n - [NEC Section ](): ""

NEC Article 100 Definitions.

What is a compartment or chamber to which one or more air ducts are connected and which forms part of the air distribution system called?

Plenum\n - [NEC Section ](): ""

Plenum

According to the NEC, what is the definition of a 'Qualified Person'?

A licensed electrician and a professional electrical engineer are two such 'qualified persons.' NEC Article 100\n - [NEC Section ](): ""

A licensed electrician and a professional electrical engineer are two such 'qualified persons.' NEC Article 100

What is an unintentional, electrically conducting connection between an ungrounded conductor and equipment or earth called?

Ground fault\n - [NEC Section ](): ""

Ground fault

When an enclosure has been constructed so that beating rain will not result in the entrance of water under specified test conditions, what is the enclosure known as?

This type of enclosure is designed to keep rainwater out of the device. NEC Article 100 Definitions See Figure 1-10.\n - [NEC Section ](): ""

This type of enclosure is designed to keep rainwater out of the device. NEC Article 100 Definitions See Figure 1-10.

What is the point on the wiring system at which current is taken to supply utilization equipment known as?

An outlet\n - [NEC Section ](): ""

An outlet

The agency that publishes the NEC is abbreviated as?

The National Fire Protection Association.\n - [NEC Section ](): ""

The National Fire Protection Association.

What is a raceway designed for holding?

conductors. NEC Article 100\n - [NEC Section ](): ""

conductors. NEC Article 100

What does a conduit, such as rigid steel conduit, contain?

electrical conductors and other protective devices. NEC Article 100\n - [NEC Section ](): ""

electrical conductors and other protective devices. NEC Article 100

What is an electric circuit that controls any relay called?

NEC Article 100 Definitions. See Figure 1-12.\n - [NEC Section ](): ""

NEC Article 100 Definitions. See Figure 1-12.

What is an electric circuit that energizes signaling equipment known as?

For example, a circuit consisting of a low-voltage transformer; pushbuttons, door chime; and NEC Article 100 conductors is a signaling circuit; SO is a security alarm system Definitions:\n - [NEC Section ](): ""

For example, a circuit consisting of a low-voltage transformer; pushbuttons, door chime; and NEC Article 100 conductors is a signaling circuit; SO is a security alarm system Definitions:

What is a device called that, by insertion in a receptacle, establishes a connection between the conductor of the attached flexible cord and the conductors connected permanently to the receptacle?

Also called a plug cap or plug: NEC Article 100 Definitions: See Figure 1-13.\n - [NEC Section ](): ""

Also called a plug cap or plug: NEC Article 100 Definitions: See Figure 1-13.

What is the purpose of the diagram in Figure 1-13?

Several types of attachment-plug configurations\n - [NEC Section ](): ""

Several types of attachment-plug configurations

What is a device that establishes a connection between two or more conductors by means of mechanical pressure and without the use of solder called?

NEC Article 100 Definitions, Connector; Pressure. See Figure 1-14. Ringgroove Multistud Spade Butt connector Slide One barrel, short offset tongue One barrel, offset tongue One barrel, fixed tongue Figure 1-14: Several types of pressure connectors used in electrical work\n - [NEC Section ](): ""

NEC Article 100 Definitions, Connector; Pressure. See Figure 1-14. Ringgroove Multistud Spade Butt connector Slide One barrel, short offset tongue One barrel, offset tongue One barrel, fixed tongue Figure 1-14: Several types of pressure connectors used in electrical work

What is a continuous load?

For example, electric baseboard heaters in the coldest weather will more than likely operate for longer than three hours. Therefore, circuits feeding these units must be rated as continuous. NEC Article 100 Definitions\n - [NEC Section ](): ""

For example, electric baseboard heaters in the coldest weather will more than likely operate for longer than three hours. Therefore, circuits feeding these units must be rated as continuous. NEC Article 100 Definitions

What is a branch circuit called that supplies a number of outlets for lighting and appliances?

A general purpose branch circuit supplies two or more receptacles or outlets for lighting and appliances. (Circuits feeding any duplex receptacles other than small appliance and laundry equipment are also general purpose branch circuits. NEC Article 100 Definitions, Branch Circuit, General Purpose.\n - [NEC Section ](): ""

A general purpose branch circuit supplies two or more receptacles or outlets for lighting and appliances. (Circuits feeding any duplex receptacles other than small appliance and laundry equipment are also general purpose branch circuits. NEC Article 100 Definitions, Branch Circuit, General Purpose.

What is a device used to govern, in some predetermined manner, the electric power delivered to an electric apparatus called?

A controller. A wall switch controlling a lighting fixture is one example. A motor starter or controller is another example. A rheostat or electronic dimmer used to vary the light intensity is also a controller. NEC Article 100 Definitions.\n - [NEC Section ](): ""

A controller. A wall switch controlling a lighting fixture is one example. A motor starter or controller is another example. A rheostat or electronic dimmer used to vary the light intensity is also a controller. NEC Article 100 Definitions.

Which of the following qualifying terms indicate that a circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range?

Adjustable. The term 'adjustable' (as applied to circuit breakers) means that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range. NEC Article 100 Definitions, Circuit Breaker; Adjustable.\n - [NEC Section ](): ""

Adjustable. The term 'adjustable' (as applied to circuit breakers) means that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range. NEC Article 100 Definitions, Circuit Breaker; Adjustable.

What is the ratio of the maximum demand of a system or part of a system to the total connected load known as?

The NEC recognizes that every electrical outlet or piece of electric equipment will not all be operating simultaneously: Therefore, the NEC allows a demand factor for certain installations. NEC Article 100\n - [NEC Section ](): ""

The NEC recognizes that every electrical outlet or piece of electric equipment will not all be operating simultaneously: Therefore, the NEC allows a demand factor for certain installations. NEC Article 100

What are electric parts that are not suitably guarded, isolated, or insulated and are capable of being inadvertently touched or approached nearer than a safe distance by a person known as?

A switchboard with knife switches, for example, has exposed live electrical parts. NEC Article 100 Definitions\n - [NEC Section ](): ""

A switchboard with knife switches, for example, has exposed live electrical parts. NEC Article 100 Definitions

What is a device intended for the protection of a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a class device?

Class A GFCIs trip when the current to ground has a value in the range of 4-6 mA. Ground-fault circuit-interrupters are required on all residential receptacles installed outdoors, bathrooms and kitchens, and in garages, etc. NEC Article 100 Definitions. See Figure 1-15.\n - [NEC Section ](): ""

Class A GFCIs trip when the current to ground has a value in the range of 4-6 mA. Ground-fault circuit-interrupters are required on all residential receptacles installed outdoors, bathrooms and kitchens, and in garages, etc. NEC Article 100 Definitions. See Figure 1-15.

What does the NEC use the term 'isolated' to mean?

For example, a safety switch with a means of locking the access door to live interior parts would be considered to be not readily accessible.\n - [NEC Section ](): ""

For example, a safety switch with a means of locking the access door to live interior parts would be considered to be not readily accessible.

What are accessories such as locknuts, bushings, etc. known as?

A fitting can be a locknut, bushing, or other part of a wiring system that is intended to perform a mechanical rather than an electrical function.\n - [NEC Section ](): ""

A fitting can be a locknut, bushing, or other part of a wiring system that is intended to perform a mechanical rather than an electrical function.

What is an arrangement of incandescent lamps or electric discharge lighting to call attention to a building called?

Outline lighting. Lighting fixtures of many types, but especially neon, are used to highlight signs, buildings, and the like.\n - [NEC Section ](): ""

Outline lighting. Lighting fixtures of many types, but especially neon, are used to highlight signs, buildings, and the like.

What is the term for the operation of equipment in excess of its normal, full-load rating?

For example, a conductor operating in excess of its rated ampacity that, if it persists for a sufficient length of time, would cause damage or dangerous overheating. A ground fault, such as a short circuit or fault, is not an overload. NEC Article 100 Definitions.\n - [NEC Section ](): ""

For example, a conductor operating in excess of its rated ampacity that, if it persists for a sufficient length of time, would cause damage or dangerous overheating. A ground fault, such as a short circuit or fault, is not an overload. NEC Article 100 Definitions.

What is the term used to describe the value of current, time, or both at which an adjustable circuit breaker is set to trip?

The setting of a circuit breaker is the value of current, time, or both at which an adjustable circuit breaker is set to trip. NEC Article 100 Definitions, Circuit Breaker; Setting.\n - [NEC Section ](): ""

The setting of a circuit breaker is the value of current, time, or both at which an adjustable circuit breaker is set to trip. NEC Article 100 Definitions, Circuit Breaker; Setting.

What must not be allowed to come in contact with the interior parts of electrical equipment?

NEC Section 110.12_(B) states that internal parts of electrical equipment must not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or corrosive residues.\n - [NEC Section ](): ""

NEC Section 110.12_(B) states that internal parts of electrical equipment must not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or corrosive residues.

How tall must a wall, screen, or fence be that encloses an outdoor electrical installation over 600 volts to deter access by unqualified persons?

NEC Section 110.31 requires a wall, screen, or fence to be not less than 4 feet in height when it is used to enclose an outdoor electrical installation with voltages over 600 volts.\n - [NEC Section ](): ""

NEC Section 110.31 requires a wall, screen, or fence to be not less than 4 feet in height when it is used to enclose an outdoor electrical installation with voltages over 600 volts.

What are the requirements for entrances to rooms or enclosures containing exposed live parts operating at over 600 volts?

NEC Section 110.34_(C) requires that entrances to all buildings, rooms, or enclosures containing exposed live parts or exposed conductors operating at over 600 volts, nominal, be kept locked unless such entrances are under the observation of a qualified person at all times.\n - [NEC Section ](): ""

NEC Section 110.34_(C) requires that entrances to all buildings, rooms, or enclosures containing exposed live parts or exposed conductors operating at over 600 volts, nominal, be kept locked unless such entrances are under the observation of a qualified person at all times.

How is a 'bathroom' defined in electrical systems?

The definition of 'bathroom' has been revised to include 'a urinal' and 'a bidet' as similar plumbing fixtures according to NEC Article 100 Definitions.\n - [NEC Section ](): ""

The definition of 'bathroom' has been revised to include 'a urinal' and 'a bidet' as similar plumbing fixtures according to NEC Article 100 Definitions.

What best describes festoon lighting?

Defined in NEC Article 100 Definitions: specified test conditions?\n - [NEC Section ](): ""

Defined in NEC Article 100 Definitions: specified test conditions?

What term is used to describe an enclosing case that will not allow dust to enter under specified test conditions?

NEC Article 100 Definitions:\n - [NEC Section ](): ""

NEC Article 100 Definitions:

What is an assembly of one or more enclosed sections and principally containing motor control units called?

NEC Article 100 Definitions states that the described apparatus is referred to as a motor control center: See Figure 1-16.\n - [NEC Section ](): ""

NEC Article 100 Definitions states that the described apparatus is referred to as a motor control center: See Figure 1-16.

What is the name of an electrical load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage?

Nonlinear load\n - [NEC Section ](): ""

Nonlinear load

How many access entrances are required to the working space about electrical equipment rated 1200 amperes or more and over 6 feet wide?

One entrance not less than 24 inches wide and 6 feet high at each end of the work space is required.\n - [NEC Section ](): ""

One entrance not less than 24 inches wide and 6 feet high at each end of the work space is required.

When the electrical equipment exceeds 6 feet in height, what is the required minimum headroom?

NEC Section 110.26(4)(3) requires a minimum headroom working space of 6 feet; the minimum headroom shall not be less than the height of the equipment if the equipment exceeds 6 feet in height.\n - [NEC Section ](): ""

NEC Section 110.26(4)(3) requires a minimum headroom working space of 6 feet; the minimum headroom shall not be less than the height of the equipment if the equipment exceeds 6 feet in height.

Where must branch circuits and feeders be identified?

NEC Section 110.22 requires circuit identification at the disconnecting means. This is usually at the main distribution panel for feeders and at subpanels for branch circuits. If overcurrent protective devices are located properly, this is the location where the circuits should be identified. The marking shall be able to withstand the environment involved.\n - [NEC Section ](): ""

NEC Section 110.22 requires circuit identification at the disconnecting means. This is usually at the main distribution panel for feeders and at subpanels for branch circuits. If overcurrent protective devices are located properly, this is the location where the circuits should be identified. The marking shall be able to withstand the environment involved.

What is the minimum depth of clear working space at electrical equipment rated above 75 kV and classified as Condition 1?

NEC Table 110.34_(A) requires 8 feet minimum depth of clear working space under the conditions described in this question.\n - [NEC Section ](): ""

NEC Table 110.34_(A) requires 8 feet minimum depth of clear working space under the conditions described in this question.

Why are calculations required for any type of electrical work?

Calculations are required for any type of electrical work from design to installations. Therefore, if you feel that your knowledge of mathematics is lacking, it is highly recommended that you find some means to improve your knowledge before taking the examination.\n - [NEC Section ](): ""

Calculations are required for any type of electrical work from design to installations. Therefore, if you feel that your knowledge of mathematics is lacking, it is highly recommended that you find some means to improve your knowledge before taking the examination.

What basic math operations are essential for electricians to know?

The basic math operations are multiplication, division, addition, and subtraction. Electricians should be able to use these operations for solving whole number problems, decimal number problems, problems dealing with fractions, squares, square roots, percents, and equations.\n - [NEC Section ](): ""

The basic math operations are multiplication, division, addition, and subtraction. Electricians should be able to use these operations for solving whole number problems, decimal number problems, problems dealing with fractions, squares, square roots, percents, and equations.

What tools are necessary for most electrical calculations?

With the four basic math operations and solving of equations, the electrician will have all the basic tools necessary for most electrical calculations.\n - [NEC Section ](): ""

With the four basic math operations and solving of equations, the electrician will have all the basic tools necessary for most electrical calculations.

What equation can be used to find the value of R in the given scenario?

101 = 20 + 30 + R\n - [NEC Section ](): ""

101 = 20 + 30 + R

How can the equation 10 - 20 - 30 = R be simplified?

R = -40\n - [NEC Section ](): ""

R = -40

What technique can be used to solve equations with known values and known relationships?

Equation-solving undoing process\n - [NEC Section ](): ""

Equation-solving undoing process

What should you be aware of after going over the questions in this chapter?

The types of questions that will appear on the typical electrician's examination and the areas where you are the weakest\n - [NEC Section ](): ""

The types of questions that will appear on the typical electrician's examination and the areas where you are the weakest

What is the total resistance of the resistors Rz and R; connected in parallel?

Rp = 10 ohms\n - [NEC Section ](): ""

Rp = 10 ohms

What is the total resistance of the entire circuit in Figure 2-2 if the total combined resistance of Rz and Rz is 10 ohms?

Rt = 15 ohms\n - [NEC Section ](): ""

Rt = 15 ohms

Assuming the battery in Figure 2-2 is 30 volts; what is the total current in the circuit?

2 amperes\n - [NEC Section ](): ""

2 amperes

According to Kirchhoff's voltage law, which of the following Ohm's law equations may be used to find the voltage drop across a resistor?

Voltage drop IR\n - [NEC Section ](): ""

Voltage drop IR

A 120-volt circuit has an electric heater connected with a current rating of 7.5 amperes. What is the resistance in ohms of the connected pure resistance load?

16 ohms\n - [NEC Section ](): ""

16 ohms

An ohmmeter shows the resistance of a 240-volt electric heater to be 19.5 ohms. What current flows through this heater?

12.3 amperes\n - [NEC Section ](): ""

12.3 amperes

What is the voltage across an incandescent lamp with a resistance of 104 ohms when 2 amperes of current flow?

E = IR; 2 x 104 = 208 volts\n - [NEC Section ](): ""

E = IR; 2 x 104 = 208 volts

What current is drawn by a 277-volt fluorescent lamp with 8 ohms reactance?

I = E/X; I = 277/8 = 34.62 amperes\n - [NEC Section ](): ""

I = E/X; I = 277/8 = 34.62 amperes

If the impedance Z of the circuit impedance triangle is 5 ohms and angle A is 30 degrees, what is the value of the inductive reactance (XL)?

sin(angle A) = side opposite / hypotenuse; sin 30 = 0.500000; XL = 5000 x sin 30 = 2.5 ohms\n - [NEC Section ](): ""

sin(angle A) = side opposite / hypotenuse; sin 30 = 0.500000; XL = 5000 x sin 30 = 2.5 ohms

What is the minimum general lighting load permitted by the NEC in a 4500 square foot warehouse?

Total volt-amperes = total square feet x 0.25 volt-amperes per square foot; 4500 x 0.25 = 1125 volt-amperes. NEC Table 220.12.\n - [NEC Section ](): ""

Total volt-amperes = total square feet x 0.25 volt-amperes per square foot; 4500 x 0.25 = 1125 volt-amperes. NEC Table 220.12.

What is the minimum general lighting load permitted in a 1500 square foot single-family dwelling as specified in Table 220.12 of the NEC?

1500 x 3 = 4500 volt-amperes. Note: this answer does not take into consideration the circuits required for small-appliance and laundry loads; these must be calculated separately.\n - [NEC Section ](): ""

1500 x 3 = 4500 volt-amperes. Note: this answer does not take into consideration the circuits required for small-appliance and laundry loads; these must be calculated separately.

The voltage per turn for a transformer is 1.25 volts. What is the voltage of the transformer if it has 192 turns?

192 x 1.25 = 240 volts\n - [NEC Section ](): ""

192 x 1.25 = 240 volts

A 50 kVA, three-phase, delta-to-wye connected, 480/120-208 volt transformer is used to supply a lighting load. What is the rated phase current on the primary side?

480 x √3 / 830.4 = 60.21 amperes\n - [NEC Section ](): ""

480 x √3 / 830.4 = 60.21 amperes

A 50 kVA, three-phase, delta-to-wye connected 480/120-208 volt transformer used to supply a balanced lighting load will have what line-current rating on the secondary?

208 x √3 / 359.84 = 138.95 amperes\n - [NEC Section ](): ""

208 x √3 / 359.84 = 138.95 amperes

What size transformer (kVA) should be used for a lighting load of 40,000 watts with a 480/277 volt Y-connected transformer supplying balanced 277-volt, single-phase?

40 kVA\n - [NEC Section ](): ""

40 kVA

What is the maximum allowable wattage that can be connected to a 240-volt, 20-ampere single-phase circuit feeding residential electric heaters?

3840 watts\n - [NEC Section ](): ""

3840 watts

An electric oven is rated at 2000 watts when connected to a 460-volt circuit: What is the resistance of the heating element?

105.8 ohms\n - [NEC Section ](): ""

105.8 ohms

What is the approximate wattage of a 240-volt motor with a resistance of 28 ohms?

2057 watts\n - [NEC Section ](): ""

2057 watts

What is the minimum allowable number of 120-volt; 15-ampere, 2-wire lighting branch circuits required for a residence 70 feet by 30 feet?

Therefore, four 15-ampere branch circuits are required.\n - [NEC Section ](): ""

Therefore, four 15-ampere branch circuits are required.

If a voltage drop of 3 volts has been determined on a 120-volt circuit, what percent is the voltage drop?

3/120 = .025 or 2.5%\n - [NEC Section ](): ""

3/120 = .025 or 2.5%

If a voltage drop of 8.31 volts has been determined on a 277-volt lighting circuit, what percent is the voltage drop?

8.31/277 = 03 or 3%\n - [NEC Section ](): ""

8.31/277 = 03 or 3%

If a voltage drop of 7.2 volts is found on a 240-volt circuit, what percent is the voltage drop?

7.2/240 = .03 or 3%\n - [NEC Section ](): ""

7.2/240 = .03 or 3%

What percent is the voltage drop of 19.2 volts on a 480-volt circuit?

19.2/480 = 0.04 or 4%\n - [NEC Section ](): ""

19.2/480 = 0.04 or 4%

What current is drawn in a 120-volt circuit feeding six 80-watt fluorescent lamps with a power factor of 0.91?

120 x 0.91 / (6 x 80) = 4.3395 or 4.4 amperes\n - [NEC Section ](): ""

120 x 0.91 / (6 x 80) = 4.3395 or 4.4 amperes

Calculate the minimum volt-ampere capacity of a 155,000 square foot school.

NEC Table 220.12 gives the minimum volt-amperes for a school as 3 per square foot. 155,000 x 3 = 465,000 or 465 kVA.\n - [NEC Section ](): ""

NEC Table 220.12 gives the minimum volt-amperes for a school as 3 per square foot. 155,000 x 3 = 465,000 or 465 kVA.

How many light fixtures need to be installed in a store building that is 50 feet x 60 feet and uses fluorescent lighting fixtures to illuminate the interior, with each fixture illuminating 60 square feet?

50 x 60 = 3000 square feet / 60 = 50 lighting fixtures\n - [NEC Section ](): ""

50 x 60 = 3000 square feet / 60 = 50 lighting fixtures

What is the amount of current that will flow in a 120-volt circuit with an electric heating element having an energized resistance of 30 ohms?

4 amperes\n - [NEC Section ](): ""

4 amperes

How many watts of heat are being produced by the heating element in the previous question?

480 watts\n - [NEC Section ](): ""

480 watts

In a 240-volt circuit with a current flow of 20 amperes, what is the amount of resistance connected to the circuit?

12 ohms\n - [NEC Section ](): ""

12 ohms

If an electric motor has an apparent resistance of 17 ohms and a current of X amps is flowing through it, what is the connected voltage?

119 volts\n - [NEC Section ](): ""

119 volts

What is the current flow in a circuit with a 240-volt air-conditioning compressor that has an apparent resistance of 8 ohms?

I = E/R; 240/8 = 30 amperes\n - [NEC Section ](): ""

I = E/R; 240/8 = 30 amperes