600+ Free NEC Practice Questions

Which of the following statements accurately describes the 2026 NEC change regarding the calculation of continuous loads for EV charging equipment?

What is the primary reason for the NEC 2026 change from 125% to 100% continuous load calculation for EV charging equipment?

A dwelling unit in Canada, built to CEC 2024, has a 120-volt, 15-ampere branch circuit supplying a permanently wired smoke detector system in the hallway. What protection is required for this circuit?

What is the standard Locked-Rotor Current for a 50HP, 460V, 3-phase Design B motor per NEC Table 430.251(B)?

According to CEC Table 2, what is the maximum allowable ampacity for a #10 AWG copper conductor with NMD90 insulation, installed in a raceway with three current-carrying conductors, at an ambient temperature of 30°C?

Which of the following conditions would NOT typically require an ampacity adjustment factor according to NEC 310.15?

A 15A branch circuit uses #14 AWG copper conductors with TWN75 insulation. According to CEC Table 2, what is the maximum ampacity for this conductor in a raceway with two current-carrying conductors at an ambient temperature of 30°C?

Which of the following conditions would require the application of a correction factor for ambient temperature when determining conductor ampacity, as per CEC Table 2 notes?

Internal cable clamps in a box count as how many conductors for box fill?

What is the volume allowance for a 12 AWG conductor in a box fill calculation per NEC 314.16(B)(1)?

Conductors that pass through a box without splice or termination (straight pulls) count as how many conductors for box fill?

How many 20-ampere small-appliance branch circuits are required in a dwelling kitchen?

A 30-ampere branch circuit requires a minimum conductor size of:

In a dwelling unit kitchen, countertop receptacles must be installed so that no point along the wall line behind the counter is more than _____ from a receptacle outlet.

In a dwelling unit, what is the maximum permissible distance between the wall space of a kitchen countertop and the nearest receptacle outlet, measured horizontally along the wall line?

In a commercial kitchen, a 15-ampere, 125-volt general-purpose receptacle is installed. This receptacle is not part of a multioutlet assembly. What is the minimum conductor size required for this branch circuit, assuming copper conductors and 75°C terminals, according to NEC Table 310.16 and NEC 210.19(A)(1)?

An outdoor 125-volt, 15-ampere receptacle is installed on a dwelling unit's detached garage. This receptacle must be supplied by a branch circuit that also supplies which of the following?

A 20-ampere branch circuit supplies power to a single, permanently connected motor-operated appliance. What is the maximum rating of the appliance allowed on this circuit, according to NEC 210.23(A)(2)?

A 240-volt, 30-ampere branch circuit is installed to supply a fixed electric range in a dwelling unit. What is the minimum size copper equipment grounding conductor required for this circuit, assuming the circuit conductors are 10 AWG, according to NEC Table 250.122?

In the CEC 2024, what is the recommended maximum voltage drop for the entire electrical installation, from the supply to the farthest outlet?

What is the demand load for one 12kW electric range in a single-family dwelling?

The CEC requires the maximum distance between receptacle outlets along a wall in a dwelling to be:

CEC Rule 8-200 requires that the voltage drop on a branch circuit not exceed:

The Red Seal Interprovincial Standards exam for Canadian electricians is administered at which level?

The CEC equivalent of NEC Chapter 9 conduit fill tables is found in:

CEC requires GFCI protection for receptacles in bathrooms, similar to NEC 210.8. What is the CEC rule number?

In the CEC, the general lighting load for a dwelling unit is calculated at:

A homeowner wants to install an EVSE with a maximum output current of 48 amperes. Assuming the 2026 NEC changes are in effect, what is the minimum size of the overcurrent protective device (OCPD) required for this circuit?

An electrician is installing an EVSE with a continuous load of 40 amperes. Assuming the 2026 NEC changes are in effect, what is the minimum branch circuit conductor ampacity required?

Which of the following NEC articles provides guidance on voltage drop considerations for branch circuits?

During a commercial kitchen renovation, an electrician installs a 4-inch square metallic junction box in a suspended ceiling. The box is located 10 feet above the finished floor, and the ceiling tiles provide the only access to the box. The box contains splices for a 20-ampere, 120-volt lighting circuit. What is wrong with this installation?

An electrician is installing a new 20-ampere, 120-volt branch circuit for a bathroom in a dwelling unit. The circuit uses 12 AWG THHN copper conductors and is protected by a 20-ampere circuit breaker. A single 15-ampere rated duplex receptacle is installed on this circuit. What is wrong with this installation?

An electrician is installing a new 15-ampere, 120-volt general-purpose branch circuit in a dwelling unit. The circuit is wired with 14 AWG THHN copper conductors, protected by a 15-ampere circuit breaker. The circuit supplies three 20-ampere rated duplex receptacles. What is wrong with this installation?

A three-phase, 4-wire, 208Y/120V commercial kitchen in British Columbia has a connected load of 45 kW for fixed cooking appliances. According to CEC Rule 8-300 and Table 14, what is the minimum demand factor that can be applied to this load?

A commercial office building has a 12,000 sq ft general office area. What is the minimum calculated lighting load, in VA, for this area according to NEC 2026?

A commercial kitchen in a restaurant has 10,000 sq ft of floor area. In addition to the general lighting load, what is the minimum calculated receptacle load, in VA, for this area according to NEC 2026?

A small commercial store has 15 linear feet of show window. What is the minimum calculated load, in VA, for the show window lighting according to NEC 2026?

A commercial occupancy has a calculated general lighting load of 40,000 VA. What is the demand load, in VA, for the first 20,000 VA of this load according to NEC 2026 Table 220.42?

A commercial office building in British Columbia has a total floor area of 1500 m². The building will be equipped with general-purpose receptacles. According to the CEC, what is the minimum calculated receptacle load for this building?

A commercial building in British Columbia has 20 general-use 120V, 15A duplex receptacles in its common areas. According to CEC Rule 8-200(1)(a)(ii) and Table 14, what is the minimum calculated load for these receptacles?

You need to find the approximate area in square inches of a No. 12 AWG THHN conductor for conduit fill calculations. Which table in NEC Chapter 9 would provide this information?

When performing conduit fill calculations, if you have four No. 10 AWG THHN conductors, where would you find the individual area of each conductor?

When considering conductor sizing for a PV system, what factor must be applied to the maximum circuit current to determine the minimum ampacity of the conductor, as per NEC 690.8(B)(1)?

A 240V single-phase branch circuit is specified to have a maximum voltage drop of 3%. If the load current is 25A and the circuit length is 100 feet, what is the minimum circular mil area required for copper conductors? (Assume a conductor resistivity of 12.9 ohms/kcmil-foot).

A 480V, 3-phase feeder is 300 feet long and carries a continuous load of 100A. The conductors are aluminum (XHHW-2). Using a conductor resistivity of 21.2 ohms/kcmil-foot for aluminum, and given a 3% maximum voltage drop, what is the minimum required AWG size for this feeder? (Assume a power factor of 0.9).

To determine the internal cross-sectional area of a specific trade size of conduit, which table in NEC Chapter 9 should you consult?

What is the maximum conduit fill percentage when three or more conductors are installed in a raceway?

A conduit nipple not exceeding 24 inches in length may be filled to what percentage?

What is the cross-sectional area of a 12 AWG THHN conductor for conduit fill calculations?

What minimum trade size EMT is required for four 3 AWG THHN and one 8 AWG THHN (bare) equipment grounding conductor?

You need to install three 500 kcmil THHN copper conductors and one 1/0 AWG THHN ground in rigid metal conduit (RMC). What minimum trade size is required?

What is the approximate cross-sectional area (in square inches) of a single 1 AWG T90 Nylon conductor, as listed in CEC Chapter 9, Table 9?

What is the maximum number of #12 AWG THHN conductors permitted in a 1/2 inch Electrical Nonmetallic Tubing (ENT) conduit, according to NEC Chapter 9, Annex C, Table C.2?

What is the maximum allowable percentage fill for a single conductor in a conduit, as per NEC 2026, Chapter 9, Table 1, Note 1?

A conduit contains two single conductors and one multiconductor cable (e.g., a two-conductor cable with a bare ground). For the purpose of conduit fill calculations, how is the multiconductor cable treated, according to NEC Chapter 9, Note 9 to Tables C.1 through C.12?

A 3/4 inch Rigid Metal Conduit (RMC) has a total allowable fill area of 0.210 square inches for three or more conductors. If an electrician is pulling five 10 AWG THHN conductors, and each 10 AWG THHN conductor has an approximate area of 0.0211 in² (from NEC Chapter 9, Table 4), will the conduit be overfilled?

What is the maximum allowable percentage fill for a single conductor in a conduit?

An electrician is installing 7 current-carrying #1/0 AWG XHHW-2 conductors in a rigid metal conduit (RMC). According to NEC Chapter 9, Table 4 and Table 5, what is the minimum trade size of RMC required for this installation?

A control circuit requires ten No. 14 AWG T90 Nylon conductors to be installed in a Liquidtight Flexible Metal Conduit (LFMC). Using CEC Annex C, Table C.1 for conductor areas and Table C.13 for LFMC dimensions, what is the minimum trade size LFMC required?

An electrician needs to install four (4) 250 kcmil RHW-2 conductors in a conduit. Using NEC Chapter 9, Table 4, what is the minimum trade size of Rigid PVC Conduit, Schedule 40, required for this installation?

If a 12 AWG copper conductor (75°C insulation, 30A ampacity) is installed with 7 other current-carrying conductors in the same conduit, what is the new allowable ampacity after applying the adjustment factor from NEC Table 310.15(B)(2)(a)?

You are installing two current-carrying conductors in a conduit. What is the maximum conduit fill percentage you should adhere to, according to NEC Chapter 9, Table 1?

When calculating conduit fill for a single conductor in a conduit, what is the maximum fill percentage allowed by NEC Chapter 9, Table 1?

A commercial retail store in British Columbia has a continuous general lighting load of 15,000 VA. The store operates 12 hours a day. What is the minimum calculated lighting load, considering continuous operation, that must be used for service sizing according to CEC?

For dwelling unit lighting load calculations in the 2026 NEC, what is the revised minimum unit load per square foot?

A contractor is designing the electrical system for a new dwelling unit. According to the 2026 NEC, what is the minimum general lighting load to be used for a 2000 sq ft dwelling?

A dwelling unit has a 12 kW electric range. According to NEC Table 220.55, what is the minimum demand load for this range?

A dwelling unit has 2,500 sq ft of living space. It has two small-appliance branch circuits and one laundry branch circuit. What is the minimum calculated load for these three circuits that must be included in the service calculation, according to NEC 220.52(A) and (B)?

A dwelling unit has four small-appliance branch circuits and one laundry branch circuit. What is the minimum calculated load for these circuits, as required by NEC 220.52(A) and (B)?

When calculating the feeder demand for a dwelling unit with an electric range rated at 12 kW, using CEC Rule 8-200, what is the demand load for this range?

When applying Rule 8-200 for calculating the dwelling unit load for a single-family home with a floor area of 120 square meters, what is the minimum general lighting and receptacle load to be considered?

According to NEC 625.54, where an EVSE is installed in a hazardous (classified) location, the equipment must be listed for use in:

A Level 1 EV charger typically operates at what voltage and maximum current?

What is the minimum branch circuit size required by NEC 2023 for an EV-ready outlet in a new dwelling?

An Electric Vehicle Supply Equipment (EVSE) is installed at a dwelling unit. The continuous load for the EVSE is 32 amps. According to NEC 2026, what is the minimum required branch-circuit overcurrent protective device rating for this EVSE?

An EV charging station is installed outdoors at a residential dwelling. The station is a Level 2 EVSE and is not listed as watertight. What is the minimum height from the finished grade to the bottom of the enclosure for this EVSE, according to NEC 2026?

An EVSE is installed outdoors at a single-family dwelling. The charging cable is 25 feet long. What is the minimum height above grade for the attachment point of the charging cable to the EVSE enclosure, as per NEC 625.48?

Automatic load management systems (ALMS) for multiple EVSE installations are addressed in NEC 625.42. What do they allow?

A new commercial building is being constructed with 50 parking spaces. According to NEC 625.50, what is the minimum number of EV-Ready spaces required for this building?

A dwelling unit has an existing 200A service. An EVSE with a continuous load of 48A is to be installed. What is the minimum required service size, if any, considering the additional EV load and assuming no other changes to the existing loads, as per CEC 625.42?

An EVSE is installed outdoors. According to NEC 625.44, what type of protection is required for all 120-volt and 240-volt receptacles used for EV charging?

According to NEC 625.42, what is the maximum continuous current that a single EVSE can deliver to an electric vehicle?

Which approach boundary distance for a 480V exposed fixed circuit part is limited to 'Qualified Persons' only?

A hospital operating room requires an emergency lighting system. According to NEC 2026, what is the minimum duration the emergency lighting system must be capable of supplying illumination?

In an industrial facility, an emergency system is installed to power critical life safety loads. The overcurrent protective devices (OCPDs) for the emergency circuits must be accessible for maintenance and testing. According to NEC 2026, where are these OCPDs generally required to be located?

A hospital requires an emergency lighting system. What is the minimum duration that the emergency lighting system must be capable of supplying illumination for, after the failure of the normal supply, according to NEC 700.12(B)(2)?

A legally required standby system, as defined by NEC 701, is being installed in a municipal building. Which of the following is NOT an acceptable means of ensuring the reliability of the standby power source, according to NEC 2026?

An automatic transfer switch (ATS) for an emergency system serving a large assembly occupancy must be listed for emergency use and be capable of operating reliably. According to NEC 2026, what is the maximum time delay allowed for the transfer from the normal power source to the emergency power source for emergency lighting and power?

An emergency system feeder supplying a fire pump motor and its associated control equipment is installed in a building. What is the minimum fire resistance rating required for the enclosure of this feeder, if not installed in a raceway encased in 2 inches of concrete, according to NEC 700.10(D)(3)?

A branch circuit supplying emergency lighting luminaires must be installed in a manner that ensures its integrity during a fire. Which of the following wiring methods, when installed in accordance with CEC, would NOT typically be considered suitable for maintaining circuit integrity for a specified duration during a fire, without additional fire-rated enclosures or systems?

An emergency system feeder supplying power to emergency loads must be protected from physical damage. According to the CEC, what is the minimum cover required for direct buried emergency system conductors or cables under a public road?

Which of the following is NOT permitted as a source of power for an emergency system in a building as per CEC?

An electrician is performing the monthly test of an emergency generator system in a critical care facility. The test involves operating the generator under load. Per NEC, what is the minimum duration for this monthly test?

A licensed electrician is designing the emergency power system for a large assembly occupancy, such as a theater. The emergency generator will supply power to exit signs, emergency lighting, and fire alarm systems. Per NEC, what is the minimum duration the emergency power source must be capable of supplying the connected load?

An electrician is routing emergency feeder conductors for a high-rise building's exit lighting and fire pump system. The normal power feeders run through a common shaft. Per NEC, how must the emergency feeders be installed relative to the normal power feeders?

When calculating voltage drop for AC circuits, which factor is NOT typically included in the simplified voltage drop formula (VD = (2KIL)/CM or (1.732KIL)/CM)?

An electrician is installing a new non-power-limited fire alarm circuit in a commercial building. The circuit will operate at 120V and supply a total continuous load of 10 amperes. The installation requires the use of copper conductors. Per NEC 760.46 and 210.19(A)(1), what is the minimum size copper conductor required for this circuit?

An electrician is installing a non-power-limited fire alarm (NPLFA) circuit using Type NPLFP cable in a vertical run within a shaft. Per NEC 760.179(C), what is the maximum permitted length of unsupported cable between supports?

An electrician is running a new power-limited fire alarm (PLFA) circuit from a fire alarm control panel to a smoke detector. The circuit conductors are installed in the same raceway as a 120V general-purpose lighting circuit. The PLFA circuit conductors are not separated by a barrier. Per NEC 760.136(A), what is the permissible method for this installation?

Which class of fire alarm circuit allows for monitoring of the circuit's integrity even in the event of a single open?

A fire alarm system is being installed in a non-plenum space. Which of the following cable types is generally permitted for non-power-limited fire alarm (NPLFA) circuits in this application, according to NEC 2026?

A fire alarm circuit operating at 120V nominal, with a maximum current of 15A, is installed in a commercial building. If the circuit is run in a raceway with three other non-fire alarm power and lighting circuits, what is the minimum size copper conductor required for the fire alarm circuit, assuming THHN insulation and an ambient temperature of 30°C?

A fire alarm control unit (FACU) is installed in a location where the ambient temperature is expected to reach 45°C. The manufacturer's instructions for the FACU specify a maximum operating temperature of 40°C. What action is required by the NEC 2026?

A power-limited fire alarm (PLFA) circuit is installed in a building. What is the maximum allowable voltage between any two conductors of the PLFA circuit, if the power source is listed as a Class 2 power supply, and the circuit is not exposed to accidental contact with electric light or power conductors?

When installing fire alarm circuit conductors in raceways that also contain power-limited fire alarm (PLFA) circuit conductors, what is the minimum separation required between the two types of circuits if they are not separated by a barrier, according to NEC 2026?

A new 2026 NEC installation in a commercial office building includes a 125-volt, 15-ampere receptacle installed within 6 feet (1.8 m) of a bar sink. What type of protection is required for this receptacle?

Per NEC 2026, which of the following areas is *not* explicitly required to have GFCI protection for 125-volt, single-phase, 15- and 20-ampere receptacles?

According to CEC 2024 Rule 26-704(1), what is the maximum distance from a sink, measured horizontally, that a receptacle in a dwelling unit kitchen or food preparation area must be GFCI protected?

Per CEC 2024 Rule 26-704(1), which of the following is *not* a correct application of GFCI protection for receptacles in a dwelling unit?

A 2026 NEC compliant installation requires GFCI protection for all 125-volt, single-phase, 15- and 20-ampere receptacles located in which of the following *newly added* areas for 'Other Than Dwelling Units'?

A 20-ampere branch circuit supplies a 125-volt receptacle in a dwelling unit garage. According to NEC 210.8(A)(2), what type of protection is required for this receptacle?

An existing dwelling unit is undergoing a renovation that includes adding a new 20-ampere branch circuit for a laundry area. According to NEC 2026, which of the following best describes the AFCI protection requirement for this new circuit?

A new apartment building in Ontario requires AFCI protection. Which of the following rooms, according to CEC 26-724(f), consistent with NEC 210.12(A), *must* have AFCI protection for all 120 V branch circuits supplying 15 A or 20 A receptacles and outlets?

In a commercial building, a 125-volt, 15-ampere receptacle is installed in a bathroom. According to NEC 2026, what is the GFCI protection requirement for this receptacle?

Which of the following dwelling unit locations, according to NEC 210.12(A), does NOT explicitly require AFCI protection for all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices?

During a renovation in an existing Ontario dwelling unit, a new 120 V, 15 A branch circuit is being added to supply receptacles in a dining room. According to CEC 26-724(f), consistent with NEC 210.12(A), what protection is required for this new circuit?

In a commercial garage used for vehicle repair, a 125-volt, 20-ampere receptacle is installed on a wall near a workbench. According to NEC 210.8(B)(8), is GFCI protection required for this receptacle?

Which of the following outdoor installations would now require GFCI protection under the 2026 NEC, assuming it's a 240V, 50A circuit?

What is the main reason for the expansion of GFCI protection to outdoor receptacles up to 60A in the 2026 NEC?

GFCI protection is required for 125-volt, 15- and 20-ampere receptacles in dwelling unit basements per NEC 210.8(A). Which areas are included?

A Class A GFCI device trips when ground-fault current exceeds:

An AFCI (Arc-Fault Circuit Interrupter) is designed to protect against:

As of the 2023 NEC, GFCI protection is required for all 125-volt, 15- and 20-ampere receptacles in which non-dwelling location?

Where AFCI protection is required, it can be provided by which of the following methods?

Using Ohm's Law, what is the current flowing through a circuit with 120 volts and 20 ohms of resistance?

The main bonding jumper at the service connects:

A supplemental ground rod must have a resistance to earth of not more than _____ ohms, or a second rod must be installed.

What is the minimum equipment grounding conductor (EGC) size for a circuit protected by a 60-ampere overcurrent device?

A metal water piping system is used as a grounding electrode. The service entrance conductors are 4/0 AWG copper. What is the minimum size copper grounding electrode conductor required to connect to the metal water pipe, according to NEC 2026?

A 100A, 120/240V, single-phase service is installed. The main bonding jumper is required to be sized based on the service-entrance conductors. If the service-entrance conductors are 2 AWG copper, what is the minimum size copper main bonding jumper required according to NEC 250.28(D)(1)?

A main service disconnect enclosure is fed by 350 kcmil copper service conductors. The enclosure is metallic. What is the minimum size copper equipment grounding conductor required to bond the enclosure to the service neutral conductor within the enclosure?

An isolated grounding receptacle is installed in a commercial setting. According to CEC Rule 10-406(3), what is the permissible method for connecting the isolated grounding conductor back to the service equipment?

A separate building or structure is supplied by a feeder from another building. The feeder consists of 3-phase, 4-wire conductors with a 150-ampere overcurrent device. The largest ungrounded feeder conductor is 1/0 AWG copper. What is the minimum size copper grounding electrode conductor required for the separate building, if connected to a driven ground rod?

A 100A, 120/208V, 3-phase service is installed in a commercial building. The service entrance conductors are 1 AWG Copper. According to CEC Rule 10-204(1)(a) and Table 16, what is the minimum size of the copper grounding electrode conductor to a driven ground rod?

What is the minimum size copper grounding electrode conductor required for a service with 2/0 AWG aluminum service-entrance conductors, connected to a structural metal frame electrode?

A 200A service entrance conductor for a residential dwelling is composed of 3/0 AWG copper conductors. What is the minimum size copper grounding electrode conductor required to a ground rod electrode, assuming the largest service-entrance conductor is 3/0 AWG copper?

What is the minimum size copper grounding electrode conductor required for an ungrounded system with 250 kcmil copper ungrounded conductors, connected to a metal underground water pipe electrode?

A service entrance is supplied with 400 kcmil copper conductors. What is the minimum size aluminum or copper-clad aluminum grounding electrode conductor required to be connected to a building steel electrode?

A service uses 500 kcmil copper service-entrance conductors. What is the minimum size copper grounding electrode conductor required if the only available electrode is a ground rod?

What is the maximum resistance to ground allowed for a single ground rod electrode?

When installing intrinsically safe apparatus in a Class I, Division 1 location, what is the minimum separation distance required between intrinsically safe wiring and non-intrinsically safe wiring, if not separated by a grounded metal barrier or installed in separate raceways, according to CEC Rule 18-090?

A portable electric lamp is to be used in a Class I, Division 1 location. According to NEC 2026, what is the minimum required rating or listing for this lamp?

A Class I, Division 1 location contains ignitable concentrations of flammable gases or vapours under normal operating conditions. According to CEC Rule 18-050, what is the minimum required distance that the seal fitting for a conduit containing conductors that pass from a Class I, Division 1 area to an unclassified area must be located from the boundary?

In a Class II, Division 1 location, which type of conduit sealing is required for a conduit that passes from the hazardous area to an unclassified area, where the conduit contains wiring for a dust-ignitionproof motor?

Which Class and Division classification applies to a location where ignitable concentrations of flammable gases or vapors can exist under normal operating conditions?

For a Class II, Division 1 location containing combustible dust, what is the maximum surface temperature allowed for electrical equipment that is not subject to overload, according to CEC Table 18, Group E dusts?

A facility in Ontario has an area classified as Class I, Division 2, Group C. Which of the following statements is TRUE regarding the requirements for electrical equipment in this location, according to the CEC and NEC 500?

An electrical installation is being designed for a Class II, Division 2 location where combustible dusts are not normally in the air but may be present due to infrequent malfunction of handling or processing equipment. According to NEC 2026, which type of protection technique is generally permitted for wiring methods in this location, assuming the dust is Group E?

In a Class III, Division 1 location, where ignitable fibers or flyings are present in the air in quantities sufficient to produce ignitable mixtures, what is the minimum required conduit seal-off fitting requirement for a conduit entering an enclosure containing arcing or high-temperature devices, according to NEC 2026?

An electrical installation in Ontario is planned for a Class II, Division 1 location, containing combustible carbonaceous dusts. According to NEC 500 and CEC, what is the maximum permissible operating temperature for electrical equipment that is NOT subject to overloading and is NOT heat-producing, when the dust has an ignition temperature of 200°C?

In a Category 2 space of a healthcare facility, what is the minimum number of receptacles required at each patient bed location?

In a hospital operating room (Category 1 space), what is the maximum permissible voltage for a branch circuit supplying fixed lighting, as per NEC 2026, assuming the luminaires are not more than 8 feet above the floor?

In a general care area of a hospital, what is the minimum number of receptacles required at each patient bed location, excluding those for dedicated equipment?

A hospital operating room is considered a wet location for patient care. As per NEC 517.20(A), what protective measure is mandated for receptacles supplying patient care equipment in such a location?

What is the minimum feeder capacity required for the essential electrical system in a hospital, as a percentage of the total calculated demand of the normal electrical system, according to NEC 2026?

A critical care area in a hospital requires an isolated power system. According to NEC 2026, what is the maximum permissible total hazard current for the isolated system, including fault hazard current and leakage hazard current?

For a hospital's essential electrical system, the emergency system branch that supplies power for illumination and power required to support patient care is known as the:

In a general care area of a hospital, what is the minimum number of single-phase, 125-volt, 15- or 20-ampere receptacles required at each patient bed location?

According to NEC 517.19(B)(2), isolated power systems in anesthetizing locations shall be equipped with a line isolation monitor. What is the maximum alarm impedance for the monitor when the sum of all connected equipment leakage current exceeds 5 mA?

Which NEC article primarily covers the requirements for feeder and service load calculations?

When using the standard method for dwelling unit load calculations, the general lighting load is calculated at:

A dwelling has one 12 kW electric range. Per Table 220.55, Column C, the demand load for a single range not exceeding 12 kW is:

The two required 20A small-appliance circuits in a dwelling contribute how much to the load calculation?

A communication cable (CAT 6A) is being installed in a plenum space above a suspended ceiling. Which of the following cable types is permitted for this application according to NEC 800.179(A)?

When installing communications cables (e.g., Cat6) in a riser application within a multi-story building, which cable type is generally required by NEC 800.179(B) if the cables are not in a raceway and pass between floors?

Which of the following wiring methods is NOT permitted for Class 2 or Class 3 circuits in a plenum space, according to NEC 725.154(A) and 725.179(A)?

When communications cables are installed in the same raceway with electric light or power conductors, what is the minimum insulation voltage rating required for the communications cables, according to NEC 800.133(A)(1)(a)?

When installing a Class 3 power-limited circuit, what is the maximum permissible voltage for a circuit supplied by a transformer with an overcurrent protection device rated 100 VA, according to NEC 725.121(A)?

When installing communications cables (e.g., Cat6) in a building, what is the maximum permissible length of unsupported horizontal cable run from a cable tray to a telecommunications outlet, according to NEC 800.110(B) (as adopted by CEC)?

A 10 horsepower, 230-volt, three-phase squirrel-cage induction motor has a full-load current (FLC) of 28 amperes, as determined from NEC Table 430.250. What is the minimum allowable ampacity for the branch-circuit conductors supplying this motor?

A 30 horsepower, 460-volt, three-phase wound-rotor motor has a nameplate FLC of 38 amperes. What is the minimum ampacity required for the branch-circuit conductors supplying this motor?

A 1 horsepower, 115-volt, DC motor is installed. Using NEC Table 430.247, what is the full-load current (FLC) for this motor?

A 5 horsepower, 460-volt, three-phase, continuous-duty AC motor has a nameplate full-load current of 7.6 amperes. Using NEC Table 430.250, the FLC is 7.6 Amperes. What is the maximum inverse-time circuit breaker rating permitted for short-circuit and ground-fault protection for this motor, assuming no special conditions?

For a 50 horsepower, 460-volt, three-phase squirrel-cage motor with a FLC of 65 Amperes (from NEC Table 430.250), what is the minimum size of THHN copper conductors required for the branch circuit, assuming continuous duty and a 75°C termination rating?

A 2 horsepower, 120-volt, single-phase motor has a nameplate full-load current of 24 Amperes. What is the maximum rating of a time-delay fuse permitted for short-circuit and ground-fault protection for this motor, assuming no special conditions?

An electrician is installing a 15 horsepower, 230-volt, single-phase motor. According to NEC Table 430.248, the FLC is 76 Amperes. What is the maximum standard rating for a non-time-delay fuse used for short-circuit and ground-fault protection for this motor?

Per NEC 430.6(A)(1), motor branch-circuit conductors and overcurrent protection shall be based on:

Overload protection for a motor with a service factor of 1.15 or greater shall not exceed what percentage of the motor nameplate current?

A 25 HP, 460V, 3-phase motor (FLC = 34A per Table 430.250) is protected by a dual-element time-delay fuse. Maximum fuse size?

The maximum rating of a non-time-delay (standard) fuse for a single motor branch circuit with an FLC of 40A is:

A single-phase, 120V, 1 HP motor with a nameplate FLC of 16A is being installed. The terminals are rated for 60°C. What is the minimum size THHN copper branch-circuit conductor required, and what is the maximum standard non-time-delay fuse size for short-circuit and ground-fault protection?

A feeder supplies three 3-phase, 460V squirrel-cage induction motors. Motor 1 is 20 HP, Motor 2 is 15 HP, and Motor 3 is 10 HP. The nameplate FLCs are 27A, 21A, and 14A respectively. What is the minimum ampacity required for the feeder conductors, assuming 75°C terminals?

A 3-phase, 208V, 7.5 HP squirrel-cage motor is being installed. The nameplate FLC is 25A. The motor has a service factor of 1.0. What is the maximum allowable setting for a separate overload relay?

Calculate the feeder conductor ampacity for a group of three motors: 10HP (14A), 20HP (27A), and 30HP (40A), all 460V 3-phase.

The NEC 2026 proposes changes to tamper-resistant receptacle requirements to include:

The NEC 2026 proposal for surge protection at dwelling units requires:

The NEC 2023/2026 requires that dwelling units have at least _____ 240V outlet(s) available for EV charging equipment.

What significant change does the NEC 2026 propose for the definition of 'Dwelling Unit'?

The NEC 2026 adds requirements for energy storage systems (ESS) in which Article?

The NEC 2026 proposes that EV charging equipment rated up to what amperage can use the 100% continuous load calculation (eliminating the 80%/125% rule)?

NEC 2026 introduces new requirements for the installation of surge-protective devices (SPDs) for dwelling units. For a new dwelling unit construction, where must a Type 1 or Type 2 SPD be installed, according to the updated Article 230.67(B)?

NEC 2026, Article 230.70 has introduced new requirements for the marking of service disconnecting means. What specific information is now mandated to be permanently marked on the service disconnecting means?

NEC 2026 has revised the requirements for readily accessible disconnecting means for heating, ventilating, and air-conditioning (HVAC) equipment. Which of the following best describes the updated requirement for a permanently installed HVAC unit, excluding cord-and-plug connected equipment?

Regarding the protection against arc-fault effects in NEC 2026, which new requirement is introduced for specific types of branch circuits in commercial and industrial occupancies?

A new requirement in NEC 2026, Section 314.28(A)(3), addresses the maximum number of conductors permitted in a pull or junction box for circuits operating at over 1000 volts. What is the newly specified minimum free space required for conductors entering or exiting such a box?

A proposed change in the 2026 NEC for commercial installations might modify the maximum number of conductors permitted in a conduit. If a 1-inch EMT conduit is to contain 12 AWG THHN conductors, and the previous NEC (Table C.1, Annex C) allowed 16 conductors, what would be the most likely impact of a change aimed at reducing conductor fill for better heat dissipation?

Which of the following statements accurately reflects a significant change in NEC 2026 regarding the calculation of feeder and service loads for dwelling units, specifically concerning the demand factors for electric vehicle (EV) charging loads?

NEC 2026 introduces changes to the requirements for ground-fault circuit interrupter (GFCI) protection for personnel. Which of the following locations, previously exempt or having limited requirements, now mandates GFCI protection for all 125-volt, single-phase, 15- and 20-ampere receptacles?

According to NEC 690.9(C), what is the maximum overcurrent device rating allowed for a PV module or source circuit if the marked series fuse rating is 20A?

The power factor of a purely resistive circuit (such as an electric heater) is:

Two 50-ohm resistors in parallel have a total resistance of:

Three 100-ohm resistors are connected in parallel. What is the total resistance?

A 3-phase, 208V circuit supplies a balanced load drawing 30A per phase. What is the total apparent power?

A parallel circuit consists of three resistors: R1 = 10Ω, R2 = 20Ω, and R3 = 30Ω. If the circuit is connected to a 60V DC source, what is the total current drawn from the source?

A 240V, single-phase motor draws a full-load current of 15A. If the motor's power factor is 0.85 lagging, what is the approximate apparent power (VA) consumed by the motor?

When troubleshooting a circuit, you measure 120V across a purely inductive load and a current of 5A. What is the approximate inductive reactance (XL) of the load?

A circuit has a total resistance of 15 Ohms and is supplied by a 120V source. If the circuit operates for 4 hours, how much energy (in kWh) is consumed?

A resistive heating element is rated at 2000W when connected to a 120V AC supply. If this same element is inadvertently connected to a 240V AC supply, what would be the approximate power dissipated by the element, assuming its resistance remains constant?

Under the 2026 NEC optional method for dwelling unit load calculations, if the calculated load before demand factors is 15 kVA, what is the new base kVA value before applying additional demand factors?

According to NEC 220.40, for a dwelling unit with a calculated load of 15,000 VA using the optional method, what is the demand factor applied to the first 10,000 VA?

A branch circuit supplies a continuous load of 32 amperes. What is the minimum continuous current rating of the overcurrent device required for this circuit, according to NEC 2026?

Overcurrent devices shall NOT be located:

Fuses and circuit breakers must be located so they are:

A continuous duty motor with a full-load current (FLA) of 40 amperes is protected by an inverse time circuit breaker. According to NEC 2026, what is the maximum standard ampere rating of the circuit breaker permitted for this motor, assuming no other specific conditions apply?

What is the maximum interrupting rating assumed for a circuit breaker if no rating is marked?

A conductor has an ampacity of 285A after derating. What is the maximum standard OCPD that can protect it?

An overcurrent protective device is required to be readily accessible. Which of the following locations would NOT be considered readily accessible?

What is the maximum standard ampere rating for a fuse or inverse time circuit breaker that protects a conductor with an ampacity of 37 amperes, assuming no specific equipment exceptions apply?

An overcurrent device is installed in a damp or wet location. What is the minimum required distance between the enclosure and the surface over which it is mounted?

Which of the following is a standard ampere rating for an overcurrent device according to NEC 240.6(A)?

A 120V circuit has a measured voltage drop of 6V. What is the percentage voltage drop for this circuit?

Is a neutral conductor required to be installed at every switch location for lighting controls?

For a single-family dwelling with a 200A service, what is the minimum size copper service-entrance conductor (THWN-2) allowed per 2023 NEC?

What is the primary purpose of a 'Mechanic's Lien'?

According to typical contract law, what document formally authorizes a contractor to proceed with work before a full contract is signed?

A dwelling unit has a 12 kW electric range. Using the standard method, what is the demand load for this range according to Column C of Table 220.55?

What is the primary purpose of rapid shutdown requirements in NEC 690.12?

According to NEC 690.12(B)(2)(2), for a PV system with an array boundary, what is the maximum allowable voltage outside the array boundary after rapid shutdown initiation?

According to NEC 690.12, what is the maximum allowable time for a PV system to reduce its voltage to 30 volts or less within the array boundary after initiation of rapid shutdown?

For a PV system on a building, Rapid Shutdown initiation devices must be located in which of the following locations?

What is the maximum number of service disconnects permitted for a single service, provided they are grouped and marked, according to NEC 230.71(A)?

Service conductors supplying a building shall not be smaller than what size copper, unless specifically permitted elsewhere in Article 230, according to NEC 230.31(A)?

What is the minimum number of disconnecting means required for a single service, as per CEC 230.71(A)?

A residential service entrance conductor for a single-family dwelling has an ampacity of 125A. According to CEC 230.79(D), what is the minimum size for the service entrance conductors (copper) if the dwelling has more than three 2-wire branch circuits and the total calculated load is 100A, considering the demand factors?

What is the maximum length allowed for service-drop conductors over residential property and driveways, as per CEC 230.24(B)(1), if they are not accessible to pedestrians and vehicles?

A service entrance mast is installed on a building. What is the minimum size of conduit required for the service mast, if the service conductors are No. 3/0 AWG copper, according to CEC Table D1?

According to NEC 230.90(A), the service overcurrent device shall be rated or set at not more than the allowable ampacity of the service conductors, except for what specific case?

The minimum service size for a single-family dwelling is:

The maximum number of service disconnects permitted for a service is:

What is the minimum height above a driveway for service-drop conductors (0-750V)?

A 12 AWG copper conductor is protected by an overcurrent device. What is the maximum ampere rating of this device allowed by NEC 240.4(D)?

When applying the standard method for a dwelling unit, what is the minimum number of 20-ampere small-appliance branch circuits required for the kitchen, pantry, dining room, and breakfast room?

Solar photovoltaic (PV) systems are covered by which NEC Article?

PV system disconnecting means must be:

The NEC requires rapid shutdown of PV systems within the array boundary to limit conductors to no more than _____ volts within 30 seconds of shutdown initiation.

What type of overcurrent protection is required for PV source circuits?

A PV system interconnected with a dwelling service panel using a backfed breaker is limited to what percentage of the panel bus rating per the '120% rule'?

PV source circuit conductors must be sized at a minimum of _____ of the short-circuit current (Isc) of the PV module.

A residential PV system in Alberta is being installed with a maximum PV system voltage of 550V DC. According to CEC 690.7(A) and NEC 690.7(A), what is the maximum permissible PV system voltage for a one-family dwelling?

A stand-alone PV system in Alberta is being installed with a battery bank. The battery manufacturer specifies a maximum charging current of 100A for the 48V nominal battery bank. According to CEC 690.71(B)(1) and NEC 690.71(B)(1), what is the minimum continuous current rating required for the overcurrent protective device (OCPD) protecting the battery bank circuit?

A PV array in Alberta is installed on a detached garage. The maximum PV system voltage is 400V DC. According to CEC 690.14(C)(2) and NEC 690.14(C)(2), where must the PV array disconnect be located?

A PV array has a maximum system voltage of 600V. The array is located on a commercial rooftop. The DC PV conductors are installed in a metal conduit. What is the minimum required size for the equipment grounding conductor (EGC) for the DC PV circuits if the largest overcurrent protective device (OCPD) in the circuit is 80A, according to NEC 2026?

An interactive PV system is connected to a 200A, 240V, single-phase service. The PV system's inverter output circuit has a maximum continuous output current of 40A. The main service disconnect is rated for 200A. What is the maximum allowable continuous output current for an additional PV system that can be connected to the supply-side of the service disconnect, assuming no other loads are connected to the supply side, according to NEC 2026?

A stand-alone PV system is being installed in a remote cabin. The battery bank consists of lead-acid batteries with a nominal voltage of 48V. The overcurrent protective device (OCPD) for the battery circuit is located 2.5 meters (approximately 8 feet) from the battery terminals. What is the maximum allowable continuous current rating for the OCPD protecting the battery conductors, assuming the conductors are sized for 125% of the maximum anticipated load current of 100A, and considering all applicable NEC 2026 requirements for battery circuits?

A PV array is installed on a roof with a maximum ambient temperature of 40°C (104°F). The PV source circuits are run in conduit on the roof. What is the minimum temperature adder that must be applied to the ambient temperature for conductor temperature correction, as per NEC 2026, Table 690.31(C)?

When disconnecting means for PV systems are grouped, how many such disconnecting means are permitted to be grouped at a single location, as per NEC 2026, without requiring additional marking indicating the location of the other disconnecting means?

According to NEC 2026, what is the maximum permissible voltage for a PV system's DC circuits in a dwelling unit, measured between any two conductors or between any conductor and ground?

For a group of resistance welders, what percentage of the FLC of the largest welder is used for conductor sizing?

For a dwelling unit using the standard method, what demand factor is applied to the portion of the general lighting and small-appliance load exceeding 3,000 VA but not exceeding 120,000 VA?

A storable pool (portable) requires GFCI protection for all electrical equipment associated with it.

Underwater pool lighting fixtures operating at more than 15 volts must be protected by:

For a permanently installed swimming pool, the branch circuit supplying a pool pump motor, when installed in a dwelling unit, must be sized at not less than what percentage of the motor's full-load current rating?

A permanently installed hydromassage bathtub in a dwelling unit must have all 125-volt, single-phase, 15- and 20-ampere receptacles located within what minimum distance from the inside walls of the tub protected by a Class A ground-fault circuit interrupter?

What is the minimum depth below the finished grade or deck level that rigid metal conduit (RMC) or intermediate metal conduit (IMC) containing the supply conductors for a permanently installed pool pump motor must be buried if no concrete encasement is provided?

For a permanently installed swimming pool, the equipotential bonding grid must extend how far horizontally beyond the inside wall of the pool?

The grounding conductor for the common bonding grid of a permanently installed swimming pool must be sized not smaller than what AWG copper conductor?

A feeder conductor is tapped to supply a panelboard. The tap conductor is 10 feet long and terminates in an overcurrent device rated for the tap conductor's ampacity. What is the minimum size of the tap conductor relative to the feeder overcurrent device rating, according to the 10-foot tap rule?

A 2 AWG copper conductor (rated 115A in Table 310.16 at 75°C) is used as a feeder. A tap conductor is taken from this feeder. If the tap conductor is 10 feet long and protected by a 40A overcurrent device at its termination, what is the minimum ampacity required for the tap conductor according to NEC 240.21(B)(1)?

A motor circuit tap conductor is 15 feet long. It terminates in a motor branch-circuit short-circuit and ground-fault protective device. What is the maximum length allowed for this tap conductor without additional overcurrent protection at the tap point, according to NEC 430.28?

When applying temperature correction factors from NEC Table 310.15(B)(1), which column should be used for a conductor with THHN insulation?

A conductor with a 75°C insulation rating is connected to a terminal marked for 60°C. According to CEC Rule 4-006, what is the maximum continuous operating temperature permitted for this conductor at the terminal?

A transformer has a primary voltage of 480V and a secondary voltage of 120V. If there are 1000 turns on the primary, how many turns are on the secondary?

A 75 kVA, single-phase transformer with a 240V secondary has a rated secondary current of approximately:

What is the rated primary current for a 45 kVA, 480V primary, 3-phase transformer?

An oil-insulated transformer with a rating of 750 kVA is installed outdoors, adjacent to a building. The building wall is constructed of noncombustible materials. According to NEC 2026, what is the minimum horizontal separation required between the transformer and the building wall if no fire-resistant barrier is provided?

A dry-type transformer rated 112.5 kVA, 480V primary, 208Y/120V secondary, is installed indoors. What is the minimum separation distance required from combustible materials if the transformer has a temperature rise of 150°C and no fire-resistant barrier is provided, according to NEC 450.21(A)?

A 480V primary to 208Y/120V secondary transformer, rated at 30 kVA, is installed in a commercial building. The primary overcurrent protection device is sized at 125% of the transformer's rated primary current. What is the maximum rating of the secondary overcurrent protection device permitted by NEC 2026, assuming the primary protection is set at 125% and the secondary protection is the sole protection for the secondary circuit?

A 100 kVA, 480V primary, 208Y/120V secondary, three-phase transformer is supplied by a feeder. The primary overcurrent protection is located at the supply end of the feeder. What is the maximum rating of the primary overcurrent protection device, assuming the transformer has an impedance of 5% and is protected at 125% of its rated primary current, as permitted by NEC 450.3(B) Table 450.3(B)?

A 50 kVA, three-phase transformer is installed in a building. The primary voltage is 480V, and the secondary voltage is 208Y/120V. What is the minimum size of the primary feeder conductors, assuming 75°C terminals and continuous load, if the primary overcurrent protection is rated at 125% of the transformer's full-load current and the conductors are sized at 125% of the overcurrent device rating, as per NEC 210.19(A)(1)?

The 'K' constant for aluminum conductors used in voltage drop calculations is:

The NEC recommends a maximum voltage drop of what percentage on branch circuits?

In the voltage drop formula, 'D' represents:

What is the voltage drop on a single-phase 120V circuit with 20A load, 100 feet of 12 AWG copper? (K = 12.9, CM of 12 AWG = 6,530)

A 3-phase 480V feeder supplies 60A over 250 feet of 4 AWG copper (41,740 CM). What is the approximate voltage drop?

What minimum conductor size (copper) is needed to limit voltage drop to 3% on a single-phase 240V, 50A circuit over 150 feet?

A 208V, three-phase feeder supplies a balanced load of 60A. The feeder length is 200 feet. Using 6 AWG copper conductors (THWN-2), what is the approximate voltage drop? (Assume a conductor resistivity of 12.9 ohms/kcmil-foot and a power factor of 0.85).

A feeder supplies a load with a calculated voltage drop of 4.5%. The NEC recommends a maximum of 3% for feeders. To reduce the voltage drop to the recommended limit, which of the following actions would be most effective?

A transfer switch for an emergency system in an industrial facility is rated for 400A. What is the minimum required wire bending space for 600V conductors terminating at this transfer switch, assuming a single conductor per terminal and the terminals are opposite one another?

What is the maximum overcurrent protection permitted for a 14 AWG copper conductor?

When six current-carrying conductors are run in the same raceway, the ampacity adjustment factor per NEC 310.15(C)(1) is:

Which NEC section permits the use of the 90°C ampacity column for ampacity adjustment/correction calculations, provided the final value does not exceed the 75°C terminal rating?

A 3 AWG THHN copper conductor is installed in an ambient temperature of 52°C. What is its corrected ampacity? (Use 75°C column.)

Twelve current-carrying THHN conductors are installed in the same conduit in an area with 40°C ambient temperature. What is the final ampacity of each 8 AWG copper conductor?

A single-phase 240V circuit supplies a 9,600 VA continuous load over 200 feet of copper THWN-2. Minimum conductor size if limited to 3% voltage drop is approximately:

A 240-volt circuit for a continuous load draws 30 Amperes. Assuming copper conductors with THWN-2 insulation and 75°C rated terminals, what is the minimum AWG conductor size required, considering the continuous load factor of 125%?

According to NEC 2026, Table 310.16, what is the maximum allowable ampacity for a single 12 AWG copper conductor with THHN insulation in a raceway, assuming an ambient temperature of 30°C (86°F)?

According to NEC 2026, what is the maximum allowable ampacity for a single 10 AWG copper conductor with THHN insulation, installed in a raceway with no more than three current-carrying conductors, operating in an ambient temperature of 30°C (86°F)?

An aluminum service conductor, type R90, is to be installed in a raceway. The calculated service load is 150A. What is the minimum size of aluminum conductor required based on CEC Table 2 (NEC 310.16)? Assume no temperature or bundling adjustments are needed.

A 3-phase, 4-wire, 208Y/120V feeder supplies a continuous load of 100A for all three phases. The conductors are 75°C rated copper, installed in a raceway in an ambient temperature of 45°C. What is the minimum size THWN-2 copper conductor required?

What is the standard ampacity for a 14 AWG copper conductor with Romex (NM-B) cable, which typically uses 90°C insulation but is limited to the 60°C column for ampacity calculation per NEC 2026, when installed in a dry location?

An electrical panel is located in an area with an ambient temperature of 50°C. The feeder conductors are #4 AWG copper with R90 insulation. What is the maximum allowable ampacity for these conductors, considering the ambient temperature correction, according to the CEC?

An industrial facility requires a 480V, 3-phase feeder to supply a motor control center with a calculated noncontinuous load of 200A. The conductors are copper with 75°C insulation (THWN). The ambient temperature in the area is consistently 45°C. What is the minimum size copper conductor required?

A feeder supplies a continuous load of 150 amperes. The conductors are copper, Type USE-2, and will be directly buried in the earth in a trench with an ambient earth temperature of 77°F (25°C). There are 3 current-carrying conductors. What is the minimum size copper conductor required?

EMT must be supported at intervals not exceeding:

Type MC cable must be supported and secured at intervals not exceeding:

PVC conduit Schedule 80 is required when:

When installing Type MC cable in a dry location, what is the maximum permissible distance between securing points, assuming the cable is not subject to physical damage and is installed horizontally?

What is the volume allowance required for a Luminaire Stud (Fixture Stud) in a box fill calculation?

A nonmetallic-sheathed cable (Type NM-B) is run through bored holes in wooden studs. The edge of the hole is 1 inch from the nearest edge of the stud. According to NEC 300.4(A)(1), what protection is required for the cable?

A 4-inch square metallic box is used as a pull box for three 3-phase, 4-wire, 480Y/277V circuits. Each circuit consists of three 4 AWG THHN ungrounded conductors and one 6 AWG THHN grounded conductor. All conductors enter and exit through separate raceways on opposite sides of the box. What is the minimum length of the box, according to NEC 314.28(A)(2)?

When installing conductors in a 1-inch trade size RMC (Rigid Metal Conduit) that is 100 feet long and contains three 6 AWG THWN-2 copper conductors, what is the maximum number of additional 6 AWG THWN-2 copper conductors that can be added to this conduit without exceeding the allowable conduit fill, assuming all conductors are the same insulation type?

An electrical contractor is installing a new 600V motor control center (MCC) in an industrial facility. On the opposite side of the working space, there is a grounded structural steel column. Per NEC 2026, what is the minimum depth of working space required in front of the MCC?

An electrician is installing a new 480V switchgear lineup that is 10 feet wide in an electrical room. The room has only one entrance/exit door. Per NEC 2026, what is the minimum depth of working space required in front of the switchgear if there are exposed live parts on the opposite side?

An electrician is installing a new 480Y/277V, 1200A switchboard in a commercial building. The switchboard is located across the aisle from a concrete wall, and there are no live or grounded parts on the wall. Per NEC 2026, what is the minimum depth of working space required in front of this switchboard?