Master Electrician 2 Exam Questions & Answers 2026 (21–30)

Question 1

NEC 110.26(A)(2) requires a minimum width of working space. For equipment rated 0–2000 V, what is the minimum width of the working space?

TheoryPractice · Accepted Answer

30 inches or the width of the equipment, whichever is greater. NEC 110.26(A)(2) specifies that working space width shall be at least 30 inches, or the width of the equipment, whichever is greater, measured from left to right in front of the equipment.

Question 2

A 480 V switchboard is installed facing a concrete wall with grounded metal parts on the wall (Condition 2). Per NEC Table 110.26(A)(1), what minimum working space depth is required?

TheoryPractice · Accepted Answer

4 feet (48 inches). Under NEC Table 110.26(A)(1), for voltages 151–600 V phase-to-ground (which includes 480 V), Condition 2 requires 4 feet (48 inches) of working space depth. Condition 2 exists when grounded parts are on one side and live parts on the other.

Question 3

What is the primary purpose of equipment grounding in an electrical system?

TheoryPractice · Accepted Answer

To provide a low-impedance fault-current path to operate overcurrent devices. Equipment grounding creates a low-impedance path for fault current to flow back to the source, causing the overcurrent protective device to open quickly and clear the fault, protecting people and equipment.

Question 4

Bonding in electrical systems is defined by the NEC as:

TheoryPractice · Accepted Answer

The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity. NEC Article 100 defines bonding as the permanent joining of metal parts to create a conductive path. Bonding ensures that metal enclosures, raceways, and equipment are at the same potential, preventing dangerous voltage differences.

Question 5

At a separately derived system (e.g., a transformer secondary), where must the system bonding jumper be installed?

TheoryPractice · Accepted Answer

At the source (transformer) or at the first disconnecting means, but not both. NEC 250.30(A)(1) requires the system bonding jumper for a separately derived system to be installed at the source (transformer) or at the first disconnecting means, but not at both. Installing it at both would create parallel paths for neutral current.

Question 6

GFCI protection is required by the NEC for 125 V, 15A and 20A receptacles in which of the following locations?

TheoryPractice · Accepted Answer

Bathrooms, garages, outdoors, crawl spaces, unfinished basements, and kitchen countertop surfaces. NEC 210.8 requires GFCI protection for receptacles in bathrooms, garages, outdoors, crawl spaces, unfinished basements, and kitchen countertop areas. GFCI detects ground-fault currents as small as 4–6 mA and quickly interrupts the circuit.

Question 7

According to NEC 210.8(B), GFCI protection is required for 125 V through 250 V, 15A and 20A receptacles in commercial and industrial occupancies in which area?

TheoryPractice · Accepted Answer

Rooftops, outdoors, kitchens, bathrooms, and crawl spaces. NEC 210.8(B) extends GFCI requirements in commercial/industrial settings to rooftops, outdoors, kitchens, bathrooms, crawl spaces, and similar damp or wet locations, regardless of voltage rating within 125–250 V range.

Question 8

NEC 210.8(D) requires GFCI protection for single-phase receptacles rated 250 V or less, 50A or less, installed in which location?

TheoryPractice · Accepted Answer

Outdoor areas of dwelling units, boat docks, commercial rooftops, and similar locations as specified. Starting with the 2020 NEC, 210.8(D) expanded GFCI requirements to cover single-phase, 250 V or less, 50A or less receptacles in the same locations already covered for 15/20A devices, including marinas, boat hoists, and rooftops.

Question 9

Per NEC 210.12, AFCI protection is required for all 120 V, 15A and 20A branch circuits supplying outlets or devices installed in which room types in dwelling units?

TheoryPractice · Accepted Answer

All rooms, including kitchens, family rooms, bedrooms, hallways, and similar areas. The 2017 and later NEC editions expanded AFCI requirements to cover all 15/20A, 120 V branch circuits in essentially all dwelling unit rooms. Previously, only bedrooms were required to have AFCI protection.

Question 10

When an AFCI circuit breaker is replaced in an existing panel that does not have a grounded (neutral) bus connection available at the breaker, NEC 210.12(D) permits using which alternative?

TheoryPractice · Accepted Answer

An outlet branch-circuit AFCI device at the first outlet of the branch circuit. NEC 210.12(D) allows outlet branch-circuit type AFCI protection at the first outlet when replacing a breaker in an existing panel where the panelboard is not marked to accept AFCI breakers or lacks a neutral connection.

Master Electrician 2 Exam Questions & Answers 2026 (21–30)

More Master Electrician 2 practice questions

Free practice here. Timed mocks when you are ready.