Chicago Electrical Exam

A portable appliance is one that can be easily moved from one place to another in normal use. This means that the appliance is designed to be lightweight and compact, making it convenient to transport. Examples of portable appliances include laptops, handheld vacuum cleaners, and portable heaters. Therefore, the given statement that an appliance which is actually moved or can easily be moved from one place to another in normal use is a portable appliance is true.

Copper is the most commonly used conductor for carrying current. It has low resistance, high electrical conductivity, and good thermal conductivity, making it an ideal choice for conducting electricity. Copper is also highly durable and resistant to corrosion, ensuring a long lifespan for the conductor. Additionally, copper is readily available and relatively affordable compared to other conductive materials. Therefore, copper is the preferred choice for conducting current in most applications unless otherwise specified.

A fixed appliance refers to an appliance that is securely attached or fastened to a specific location, meaning it cannot be easily moved or relocated. Therefore, the statement that an appliance which is fastened or otherwise secured at a specific location means a fixed appliance is true.

The statement accurately defines the term "Bonding (Bonded)" as the permanent joining of metallic parts to create a path for electrical conductivity and ensure the safe conduction of current. Therefore, the correct answer is True.

The statement is true because electric motor-driven fire pumps primary sources need to be able to handle the locked-rotor current of the fire pump motor(s) as well as the full-load current of the associated fire pump controller accessory equipment. This requirement ensures that the primary sources can provide enough power to the fire pump system during emergencies, allowing it to operate effectively and efficiently.

The given definition describes an appliance as something that is typically not industrial, comes in standardized sizes and types, and is installed or connected as a unit to perform specific functions such as washing clothes or cooking food. This aligns with the common understanding of an appliance, making the answer "True".

The given statement accurately defines alternating current as an electrical current that continuously fluctuates in magnitude and reverses direction at regular intervals. This is true because AC power is commonly used in households and industries due to its ability to efficiently transmit electricity over long distances and its compatibility with various devices.

The statement is true because a transformer used for the supply of underwater fixtures in swimming pools needs to be an isolated winding type. This means that there should be a grounded metal barrier between the primary and secondary windings. This barrier helps to prevent any electrical leakage or shock hazards in the swimming pool, ensuring the safety of the users.

The statement is true. Ampacity refers to the maximum amount of electric current that a conductor can carry without exceeding its temperature rating. It is expressed in amperes. Therefore, current-carrying capacity expressed in amperes is indeed ampacity.

Electrical drawings are required to be submitted with all permit applications for electrical services that are 400 amps or larger. This means that any electrical service that exceeds 400 amps will need to have accompanying electrical drawings when applying for a permit. This is likely done to ensure that the electrical system is properly designed and meets all safety and code requirements.

Direct current is a type of electrical current that flows in one direction only. Unlike alternating current, which constantly changes direction, direct current maintains a constant flow in a single direction. This is typically achieved through the use of batteries or power supplies that convert alternating current into direct current. Direct current is commonly used in electronic devices, such as computers, televisions, and mobile phones, as well as in certain industrial applications. Therefore, the statement "Direct current is electrical current which flows in one direction only" is true.

Electrical systems that are required to be grounded are connected to earth in order to protect them from voltage surges caused by lightning, line surges, or unintentional contact with higher voltage lines. This grounding helps to limit the voltage imposed on the system and stabilize the voltage to earth during normal operation. Therefore, the statement is true.

Flexible cords and cables can be used to install pendants because they provide a flexible and versatile solution for connecting lighting fixtures to the electrical supply. They are able to bend and move easily, allowing for adjustable positioning of the pendant. Additionally, flexible cords and cables are designed to withstand the electrical load and provide a safe and reliable connection. Therefore, using flexible cords and cables for pendant installation is a suitable and acceptable method.

The statement is asking whether something that is not permanently closed in by the structure or finish of a building and can be removed without disturbing the building structure or finish is considered accessible. The correct answer is True because if something can be easily removed without causing any damage or disruption to the building, it can be considered accessible.

This statement is true because a service supplying a building or structure, such as plumbing or electrical wiring, cannot physically pass through the interior of another building or structure without causing damage or disruption. Each building or structure has its own separate infrastructure and systems, and it is not possible for one building's services to directly pass through another.

The correct answer is "readily accessible location with-in 5 ft of service entrance to building." This means that the service disconnecting means, which is used to disconnect the electrical supply to a building or structure, should be installed in a location that is easily accessible and within 5 feet of the service entrance. This ensures that it can be quickly and easily reached in case of an emergency or for maintenance purposes.

The statement is true because in order to determine the size of wire necessary to carry the load, the electric load units such as kilowatts, volt amperes, kilovolt amperes, and horsepower need to be converted to amperes. This is because amperes is the unit used to measure electric current, and the size of wire needed depends on the amount of current that needs to be carried.

Dead Front refers to electrical equipment or devices that have their live parts enclosed or shielded in such a way that they are not exposed to a person on the operating side. This design ensures that there is no risk of accidental contact with live parts, providing a higher level of safety for the operator. Therefore, the given statement "The code definition of Dead Front means without live parts exposed to a person on the operating side of the equipment" is true.

This statement is true because according to the National Electrical Code (NEC) 18-27-422.10, the branch-circuit rating for an appliance that is continuously loaded, other than a motor-operated appliance, should be not less than 125 percent of the marked rating. However, if the branch-circuit device and its assembly are listed for continuous loading at 100 percent of its rating, then the branch-circuit rating can be not less than 100 percent of the marked rating.

According to code 18-27-680.22, all metallic parts of the pool structure, such as the reinforcing metal of the pool shell, coping stones, and deck, should be bonded. This means that they should be connected together to ensure electrical continuity and prevent the risk of electric shock. Hence, the correct answer is True.

All of these switches must indicate whether they are in the open or closed position. This is because it is important to know the status of the switches for safety and operational purposes. In general-use switches, it allows users to control the flow of electricity in a circuit. In motor-circuit switches, it helps in controlling the power supply to motors. Circuit breakers also need to indicate their position to show whether the circuit is open or closed, and to protect against overloads or short circuits. Therefore, all of these switches should have indicators to show their open or closed position.

When bonding enclosures, metal raceways, frames, fittings, and other metal non current-carrying parts, it is important to remove any non-conductive paint, enamel, or similar coating at contact points, contact surfaces, and threads. This ensures that there is proper electrical conductivity and bonding between the metal parts, reducing the risk of electrical hazards and ensuring the effectiveness of the bonding process.

The code definition of Accessible (as applied to wiring methods) means that the wiring methods can be removed or exposed without causing any damage to the building structure. This implies that the wiring is easily accessible for maintenance or repairs without causing any harm to the overall structure of the building. Therefore, the correct answer is True.

In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before starting work on new or replacement services or feeders rated 400 amperes or greater. This ensures that the electrical work is reviewed and approved, ensuring safety and compliance with regulations. Therefore, the statement "True" is the correct answer.

The explanation for the given correct answer is that an adjustable circuit breaker is capable of being set to trip at different levels of current, time, or both within a specific range. This feature allows for customization and flexibility in protecting electrical circuits, as different situations may require different trip values. Therefore, the statement that adjustable circuit breakers can be set to trip at various values of current, time, or both within a predetermined range is true.

A circuit breaker with a slash rating, such as 120/240V or 480Y/277V, can be used in a circuit where the voltage of any conductor to ground is lower than or equal to the lower value of the circuit breaker's voltage rating. Additionally, the voltage between any two conductors in the circuit should be lower than or equal to the higher value of the circuit breaker's voltage rating. This means that the circuit breaker can handle both the lower and higher voltages within its rating, making the statement true.

According to 18-27-310.3, conductors of size No. 8 and larger should be stranded when installed in raceways.

Flexible cables can be used to install elevators because they offer the advantage of being able to bend and flex, making them suitable for the vertical movement required in elevator systems. These cables are designed to withstand the constant motion and tension involved in elevator operation, ensuring safe and reliable transportation of people or goods. Additionally, flexible cables allow for easier installation and maintenance compared to rigid alternatives, making them a practical choice for elevator installations.

According to the National Electrical Code (18-27-402.11), fixture wires should not be used as branch-circuit conductors. This means that the wires specifically designed for connecting light fixtures should not be used to supply power to other devices or outlets. Using fixture wires as branch-circuit conductors can lead to safety hazards and code violations. Therefore, the statement "Fixture wires shall not be used as branch-circuit conductors" is true.

In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before starting work on swimming pools. This ensures that the electrical systems in the swimming pools are designed and installed correctly, reducing the risk of electrical hazards and ensuring the safety of the users. Therefore, the statement is true.

The statement is true because according to the code definition of voltages, the voltage rating of electrical equipment should always be equal to or greater than the nominal voltage of the circuit it is connected to. This ensures that the equipment can handle the electrical load and prevents any potential damage or malfunctioning that may occur if the voltage rating is lower than the nominal voltage.

Conductive materials enclosing electrical conductors or equipment need to be connected to earth in order to limit the voltage to ground on these materials. This is important for safety reasons, as it helps prevent electrical shocks and ensures that any potential electrical faults are safely directed to the ground. By connecting these materials to earth, the voltage is effectively limited, reducing the risk of harm to individuals and damage to equipment. Therefore, the statement "Conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected to earth so as to limit the voltage to ground on these materials" is true.

The given statement is true. According to section 13-12-080, any person who knowingly violates a stop work order can be incarcerated for a term of not less than three days and not more than six months. This means that if someone intentionally disregards a stop work order, they can face imprisonment for a specified period of time as punishment for their actions.

If electrical defects are reported and not fixed within 15 days, the permit privileges will be suspended. This means that if there are any issues with the electrical system and they are not addressed within the specified time frame, the individual or organization responsible for the permit will no longer have the authority to continue their activities. This emphasizes the importance of promptly addressing and resolving any electrical defects to maintain permit privileges.

In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before starting work on Warehouses greater than two stories in height. This ensures that the electrical systems in these buildings are properly designed and installed, meeting safety standards and regulations. By reviewing these plans, the Electrical Bureau can identify any potential issues or hazards and provide guidance to ensure compliance with electrical codes. Therefore, the statement "True" is the correct answer.

All electrical defects must be corrected within 15 days upon notification. This means that once any electrical issues are reported or identified, they need to be fixed within the given time frame.

When isolation of objectionable dc ground currents from cathodic protection systems is necessary, a listed ac coupling/dc isolating device can be used in the equipment grounding path. This device allows for an effective return path for ac ground-fault current while blocking dc current. This ensures that the ground-fault current can flow safely while preventing any unwanted dc currents from interfering with the cathodic protection system. Therefore, the statement is true.

The statement is true because according to the given code section (18-27-240.80), circuit breakers must be trip free, meaning they cannot be held closed after a fault occurs. Additionally, they must be capable of being manually operated, both for closing and opening. Therefore, the circuit breakers must meet these requirements to be considered compliant.

The minimum distance of clearance that service conductors installed as open conductors without an overall outer jacket must have from windows that are designed to be opened is 3 feet. This clearance is necessary to ensure the safety of the windows and prevent any potential hazards or accidents that may arise from the proximity of the conductors.

Two conductor NM cables cannot be stapled on edge because it can damage the cables and compromise their insulation. When stapling cables, it is important to ensure that they are properly secured without causing any harm to the wires. Stapling on the edge can lead to punctures or cuts in the cables, which can result in electrical hazards or malfunctions. Therefore, it is recommended to staple the cables flat against a surface to maintain their integrity and prevent any potential issues.

Auxiliary equipment such as a pump, valve, humidifier, or electrostatic air cleaner that is directly associated with the heating equipment is permitted to be connected to the same branch circuit. This means that while the central heating equipment must have its own individual branch circuit, the auxiliary equipment can share that circuit.

Ground-fault circuit interrupters (GFCIs) are allowed to be installed in a panel board that also contains circuits protected by devices other than GFCIs. This means that even if some circuits in the panel board are protected by different types of circuit interrupters, it is still permissible to have GFCIs installed for swimming pools. This is important for safety purposes as GFCIs are specifically designed to protect against electrical shock hazards in wet environments like swimming pools. Therefore, the statement is true.

A disadvantage of a direct-current system with respect to supply voltage is that the dc voltage must be generated at the level required by the load. This means that the voltage needs to be adjusted and regulated to match the specific requirements of the load, which can be a more complex and costly process compared to an alternating-current system where the voltage is easily adjustable through transformers.

The provision of the Chicago Electrical Code for transformers states that water piping is not allowed to pass through a transformer vault. This regulation ensures the safety and integrity of the transformer by preventing any potential water damage that could occur if the piping were to leak or break. By prohibiting water piping in the vault, the code aims to minimize the risk of electrical malfunctions or accidents caused by water contact.

A three gang meter 100 amp service can be installed for a two-unit multi-family residential dwelling because each unit can be allocated a separate meter and the total service capacity of 100 amps is sufficient to meet the electrical needs of both units. This setup allows for accurate measurement of electricity usage and ensures that each unit is billed separately for their consumption.

According to section 13-12-080, any person who knowingly violates a stop work order is subject to a fine of not less than $400, nor more than $1,000 for the first offense. Therefore, the statement "Any person who knowingly violates a stop work order is subject to a fine of not less than $400, nor more than $1,000 for the first offense" is true.

Flexible cords and cables may not run through holes in walls unless they are being used for one of the purposes listed in Section 18-27-400.7. This means that unless the cords and cables are being used for specific applications such as connecting equipment, temporary wiring, or other approved uses, they are not allowed to pass through holes in walls. Therefore, the correct answer is False.

The correct answer is 3. According to the given information, the motor draws 83 amps at a voltage of 460, and the desired copper wire size is #3. The National Electrical Code (NEC) specifies the minimum wire size based on the current carrying capacity. Since the motor draws 83 amps, the #3 copper wire is permissible as it can handle that current load. Therefore, the minimum size copper wire permissible by code to use is #3.

The computed floor area of dwelling units does not include open or enclosed porches.

The correct answer is "appliance rated amperes". This means that the ampere rating for an outlet for a specific appliance that is not covered in Article 220 (which provides guidelines for calculating electrical loads) should be based on the rated amperes of the appliance itself. This ensures that the outlet can safely handle the electrical current required by the appliance.

SE service-entrance cable is allowed when fully insulated conductors are used for circuit wiring and an uninsulated conductor is used for equipment grounding purposes. This means that the cable can be used to supply power to a building or structure, with the insulated conductors carrying the electrical current and the uninsulated conductor providing a path for any fault currents to safely return to the ground. This setup ensures the safety of the electrical system by properly grounding the equipment and minimizing the risk of electrical shock or damage. Therefore, the statement is true.

The statement is true because it states that the re-inspection fee for a defect found is $75.00. This implies that if a defect is found during an inspection, an additional fee of $75.00 will be charged for a re-inspection.

SE service-entrance cables without individual insulation on the grounded circuit conductor should not be used as a branch circuit within a building. This is because these cables are specifically designed for use as service-entrance conductors, which are intended to supply power to the building from the utility source. Using them as branch circuits within the building would not provide the necessary level of protection and could pose safety hazards. Therefore, it is true that these cables should not be permitted as branch circuits within a building.

Service conductors are considered outside of a building or other structure if they are installed within a building in a raceway and encased in not less than 2 feet of concrete. This means that if the service conductors are placed inside a building but are surrounded by at least 2 feet of concrete, they are still considered to be outside the building.

All of the given conditions are required in order to use the next higher standard overcurrent device rating for devices rated 800 amperes or less. The first condition states that the conductors being protected should not be part of a multi-outlet branch circuit supplying receptacles for cord-and plug-connected portable loads. The second condition states that the ampacity of the conductors should not correspond with the standard ampere rating of a fuse or a circuit breaker with overload trip adjustments above its rating, but it can have other trip or rating adjustments. The third condition states that the next higher standard rating selected should not exceed 800 amperes. Therefore, all of these conditions must be met.

Flexible cords and cables are not meant to substitute for the fixed wiring of a structure, except for specific purposes listed in Section 18-27-400.7. This means that in general, flexible cords and cables should not be used as a permanent replacement for fixed wiring. They are designed for temporary or portable use, such as connecting appliances or equipment to a power source. Using flexible cords and cables as a permanent substitute for fixed wiring can pose safety risks and may not meet the necessary electrical code requirements. Therefore, the correct answer is False.

According to section 18-27-680.5, supply conductors to a feed-through type ground-fault circuit interrupter for swimming pools are allowed in the same enclosure.

The disadvantage of a direct current due to the resistance of the transmission wires is the excessive power loss, known as the I 2R power loss. This means that as the current flows through the wires, it encounters resistance, causing energy to be lost in the form of heat. This power loss can be significant, resulting in a decrease in overall efficiency and effectiveness of the direct current system.

The minimum Volt-Amperes per Square Foot of General Lighting Load for a Barber shop is 3. This means that for every square foot of the shop, there should be a minimum of 3 Volt-Amperes of general lighting load. This requirement ensures that there is sufficient electrical power for the lighting needs of the barber shop, providing adequate illumination for the workspace and creating a comfortable environment for both the barbers and the customers.

Electrical work may not start after a permit application has been submitted to the city. The permit application needs to be approved by the city before any electrical work can begin.

The minimum Volt-Amperes per Square Foot of general lighting load that can be used in a courtroom is 2.

The statement is true because according to the National Electrical Code (NEC) section 250.20, ungrounded wiring systems must be equipped with ground detectors on the line side of the service disconnection means. This requirement ensures that any fault or abnormal condition in the grounding system can be detected and addressed promptly, reducing the risk of electrical hazards such as electric shocks or fires. By having ground detectors in place, any faults in the grounding system can be quickly identified and corrected, promoting electrical safety.

The correct answer is true because if something is not guarded by locked doors, it means that it is accessible or can be easily approached. This implies that there are no physical barriers or restrictions preventing someone from getting close to the equipment. Therefore, the equipment is considered to be accessible and can be approached without any hindrance.

The voltage drop in a circuit can be calculated using the formula V = I * R, where V is the voltage drop, I is the current, and R is the resistance. In this case, the current is given as 165 amps and the resistance can be calculated using the formula R = (ρ * L) / A, where ρ is the resistivity of the wire, L is the length of the wire, and A is the cross-sectional area of the wire. Since the wire size desired is #2/0, we can look up the resistivity and cross-sectional area in a table. Plugging in the values, we can calculate the resistance and then use it to find the voltage drop. The result is 5.7 volts.

The statement "For purpose of computing service loads, the voltages not to be used is, 120/220V" is false. This means that the voltages 120/220V can be used for computing service loads.

When a service voltage exceeds 15,000 volts between conductors enter a building, it is necessary to terminate the voltage in a metal enclosed switchgear compartment or a transformer vault. This is because these compartments provide the necessary protection and containment for high voltage equipment. They are designed to safely house and control the electrical equipment, ensuring the safety of the building and its occupants. Both options are suitable for terminating the high voltage service voltage and comply with the necessary safety regulations.

According to the given information, for conductors that are not spliced or terminated at the outlet, junction, or switch point with an opening less than 8 inches in any dimension, each conductor should be long enough to extend at least 3 inches outside the opening. This means that the statement is true.

The motor draws 165 amps at a voltage of 460, and the desired copper wire size is #2/0. According to the code, the minimum size copper wire permissible to use is 2/0.

The given statement is true. According to the code (13-20-370), the inspection fee for each nominal 20-ampere or less branch circuit, including fixtures, sockets, or receptacles, is $10.00 per branch circuit for the first 50 circuits. This means that for the first 50 circuits, regardless of the number of fixtures, sockets, or receptacles, the fee will be $10.00 per circuit.

The correct answer is 7. This means that the torque requirements for motor control circuit device terminals should be a minimum of 7 pounds per inch for screw-type pressure terminals used for 14 AWG and smaller copper conductors.

The statement is false because connecting lighting fixture wires to the branch-circuit conductors supplying the fixtures is actually permitted. According to code 18-27-402.10, it is allowed to connect the fixture wires to the branch-circuit conductors. Therefore, the correct answer is false.

The minimum requirements for service-drop conductors include No. 6 aluminum wire. This means that the conductors used for service drops should be made of No. 6 aluminum wire, which meets the necessary standards and specifications for this purpose.

In new or remodeled buildings, it is necessary to submit complete and detailed electrical plans to the Electrical Bureau before beginning work on electrical heating systems with connected loads exceeding 5 kW. This ensures that the electrical systems are properly designed and installed, meeting safety standards and regulations.

Flexible cords and cables should not be run through dropped ceilings unless they are specifically listed for that purpose in Section 18-27-400.7. This is because dropped ceilings are not designed to support the weight of these cords and cables, which can pose a safety hazard. Therefore, the correct answer is False.

According to Table 18-27-402.5, the allowable ampacity for size #14 KF-2 fixture wires is 17. Therefore, the statement "The allowable ampacity for size #14 KF-2 fixture wires is 17" is true.

According to the given statement, if the normal building source is shared by the Emergency System II auxiliary source and the primary fire pump service, no secondary power is needed for the fire pump in new buildings. Therefore, the answer is true.

The minimum Volt-Amperes per Square Foot of General Lighting Load for an auditorium is 1. This means that for every square foot of the auditorium, a minimum of 1 Volt-Ampere is required for the general lighting load.

According to Table D5010-130 in the R. S. Means Electrical Cost Data Book, a 130 ampere load at 480 volts, 3 phase, 3 wire with No. 1 wire can be run a maximum of 555 L.F. and provide satisfactory operation.

According to section 18-27-300.5(d), the use of service laterals with the type USE is allowed to emerge above ground outside at terminations in meter bases. Therefore, the statement is true.

The correct answer is 600. This means that the volt-amperes of outlets for heavy duty lamp holders should be calculated at a minimum of 600. This indicates that the outlets need to be able to handle a power load of at least 600 volt-amperes, which is a measure of the total power consumed by the lamps. This requirement ensures that the outlets are capable of supplying enough power for heavy duty lamp holders.

For extensions of existing installations, concealed knob-and-tube wiring may not be installed without any special permission.

The correct answer is 2. The minimum Volt-Amperes per Square Foot of General Lighting Load for a Hospital is 2. This means that for every square foot of space in a hospital, there should be a minimum of 2 Volt-Amperes of power allocated for general lighting purposes.

The minimum size copper wire permissible by code to use in this scenario is #6. This is because the motor draws 32 amps, and according to code regulations, the wire size must be able to handle the current without overheating. The #6 wire is capable of carrying the required current safely, while the #8 wire would not be sufficient. The #4 wire, on the other hand, is larger than necessary for this particular situation.

The given statement is false. The total square footage for service load calculations should be computed from the exterior wall dimensions, not the interior wall dimensions.

The minimum design load to include for each general purpose outlet in all occupancies is 180 volt-amperes. This means that the electrical system should be able to handle a load of at least 180 VA for each outlet. This ensures that there is enough power available for typical electrical devices and appliances that may be plugged into the outlets.

The statement is false because cable tray installations are not limited to industrial establishments. Cable trays are used in various settings, including commercial buildings, residential buildings, and even outdoor installations. Therefore, the correct answer is false.

In minimum design load computations, outlets serving switchboards and switchgear frames in telephone exchanges do not need to be included. This is because these outlets are specific to the telephone exchange infrastructure and are not part of the general electrical load that is considered in the design calculations. Therefore, they can be excluded from the computation of the minimum design load.

The minimum Volt-Amperes per Square Foot of General Lighting Load for a School that can be used is 3. This means that for every square foot of the school, there should be a minimum of 3 Volt-Amperes of lighting load. This requirement ensures that there is sufficient electrical capacity to meet the lighting needs of the school, providing adequate illumination for classrooms, hallways, and other areas.

The statement is true because according to the code 18-27-680.5, existing lighting fixtures and outlets near the pool walls must be at least 5 ft above the water level. This is to ensure safety and prevent any electrical hazards that could occur due to the proximity of the water.

According to electrical code regulations, the minimum size copper wire permissible for a motor that draws 21 amps at 230 volts with a 160 ft. feeder length is #8. This wire size is determined by considering factors such as the current draw, voltage, and length of the feeder, as well as the temperature rating of the wire. The #8 wire is able to safely handle the current and voltage requirements while also accounting for any potential voltage drop over the length of the feeder.

The given question asks for the minimum permissible size of copper wire to use for a motor that draws 21 amps at a voltage of 460 with a feeder ft. length of 190. The desired wire size is #10, so the minimum permissible size would also be #10. Therefore, the correct answer is #10.

The voltage drop can be calculated using the formula VD = (2 x K x I x L) / CM, where VD is the voltage drop, K is the resistance constant, I is the current, L is the length of the wire, and CM is the circular mils of the wire. Since the desired wire size is #3, which has a CM value of 52640, and the current is 83 amps, the voltage drop would be 7.2 volts.

The primary provision of electricity to a six unit Multi-family dwelling building is through a service drop. A service drop refers to the overhead or underground wires that connect the utility's power lines to the building's electrical panel. This is the point where the utility company's responsibility ends, and the building owner's responsibility begins for distributing the electricity to individual units.

According to the given reference (18-27-250.2), the earth should not be used as the sole equipment grounding conductor or fault current path. This means that relying solely on the earth for grounding is not sufficient for ensuring electrical safety. Instead, proper equipment grounding conductors should be installed to provide a reliable path for fault currents. Therefore, the correct answer is False.

The correct answer is False because according to Table 18-27-402.5, the allowable ampacity for size #12 KF-2 fixture wires is 20, not 25.

The correct answer is False because according to Table 18-27-402.5, the allowable ampacity for size #10 KF-2 fixture wires is not mentioned.

The statement is false because the unit lighting load specified in the code book is not the required lighting load for each square foot of floor area. The unit lighting load is a standard value used for calculations, but the actual required lighting load may vary depending on factors such as the type of occupancy, the purpose of the space, and local regulations.

The explanation for the given answer "False" is that the statement is incorrect. Instantaneous Trip, as applied to circuit breakers, means that there is no intentional delay in the tripping action. In fact, an instantaneous trip circuit breaker is designed to trip immediately when the current exceeds a certain threshold, regardless of the magnitude of the current. Therefore, the delay in tripping action does not decrease as the current increases.

The code definition of Cutout Box does not mean an enclosure designed for recess mounting. Therefore, the correct answer is False.

The Chicago Electrical Code requires that all electrical work be performed by licensed electricians to ensure safety and compliance with electrical codes. This helps protect individuals and property from potential electrical hazards and ensures that electrical installations meet the city's standards.