Electrical General (2B) Exam Prep
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Free 2B Practice Questions

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The 2B exam has 50 questions and runs 2 hours.

These 10 free 2B questions are organized by exam domain, so you can see how each part of the Electrical General (2B) blueprint is tested. Reveal the answer and explanation under each question.

Domain 1: Cabinets, Panelboards, Switchboards, Boxes, and Conduit Bodies

Question 1

Six 12/2 NM-B cables enter a receptacle box. All twelve insulated conductors are spliced inside; all six equipment grounding conductors are also 12 AWG. Internal cable clamps and one duplex receptacle yoke are present. The 12 AWG receptacle pigtails remain entirely inside the box, and no other fill allowances apply. Using the 2020 NEC box-fill rules and 2.25 cubic inches per 12 AWG allowance, select the smallest total box-and-ring volume offered below that accommodates the installation.

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Correct answer: D - 40 cubic inches

Domain 2: Calculations of Load

Question 2

A warehouse feeder supplies 88 general-use duplex receptacles, each on its own yoke. No specific appliance loads are assigned to these outlets. After applying the permitted 2020 NEC receptacle demand factors, how many volt-amperes should be carried into the feeder calculation for these receptacles?

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Correct answer: B - 12,920 VA

Domain 4: Conductors and Overcurrent Protection on the Load Side of the Service

Question 3

A 60 A, 208 V, three-phase receptacle in an indoor commercial washdown area is supplied by a 60 A branch circuit from a 120/208Y V system. The project follows the 2020 NEC, but the installer proposes omitting GFCI protection because the circuit exceeds 50 A. How should the inspector respond?

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Correct answer: A - Provide Class A GFCI protection for this receptacle.

Domain 5: Generators other than Dwellings

Question 4

During testing of a commercial standby system, current tracks the load in the generator's equipment grounding conductor. The three-pole transfer switch leaves the utility and generator neutrals solidly connected. Both the service and generator have neutral-to-enclosure bonds; the generator's listed wiring arrangement permits its bond to be removed. With the transfer arrangement retained, which code-compliant change eliminates this parallel neutral-current path?

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Correct answer: C - Remove the generator's neutral bond; retain its equipment-grounding connection.

Domain 6: Lighting and Utilization Equipment

Question 5

A clothes-closet redesign under the 2020 NEC leaves 8 inches between the proposed ceiling luminaire and the defined storage-space boundary. Every proposed light source is completely enclosed, and none of the fixtures is specially identified for installation within the storage space. Which mounting-and-light-source combination is permitted at that clearance?

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Correct answer: D - Recessed LED.

Domain 7: Motors other than Dwellings

Question 6

At a hotel's conveyor drive, a disconnect is visible from the motor and controller, 18 feet away, but a partition blocks its view from the driven conveyor. A lock-open attachment has been proposed. No exception to the motor-disconnect location rule applies. Which revision satisfies the missing sight requirement?

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Correct answer: C - Provide a motor disconnect in sight of both the motor and the driven conveyor.

Domain 8: Service Equipment and Conductors on the Supply Side of the Service

Question 7

Four grouped disconnects are proposed for one new commercial service. Ratings, service-conductor arrangements and other service requirements are satisfactory. Which enclosure layout can be used under the 2020 NEC provisions for two to six service disconnects?

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Correct answer: C - Four separate panelboard enclosures, each with one service main breaker.

Domain 9: Special Installations or Constructions

Question 8

A rooftop PV installation governed by the 2020 NEC uses the voltage-control method for rapid shutdown within the array boundary. Eighteen seconds after initiation, the highest controlled-conductor voltage is 24 V outside the boundary and 72 V inside it; both remain stable. The readings cover every conductor-to-conductor and conductor-to-ground combination. What do these results establish?

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Correct answer: C - Both locations meet their respective shutdown voltage and timing limits.

Domain 10: Special Occupancies

Question 9

The approved classification for a process room is Class I, Division 1, Group C. The vapor mixture has a specified ignition temperature of 175°C. Four luminaires are otherwise suitable for the room, with temperature markings valid at its ambient temperature. Which marking satisfies the combination of division, gas group and temperature?

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Correct answer: B - Class I, Division 1, Groups C and D, T4 (135°C)

Domain 12: Wiring Methods

Question 10

The conductors in an underground PVC raceway will be sized using a 90°C insulation ampacity for correction and adjustment. A separate check will enforce the equipment's 75°C terminal limit. Which complete insulation marking allows that 90°C starting point in this wet location?

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Correct answer: D - THWN-2

The rest of the 2B blueprint

The 2B exam also covers these domains. Drill them in the full free practice test:

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