Question 1

GFCI protection is required for all 125V through 250V receptacles supplied by single-phase branch circuits rated 150V or less to ground in which of the following dwelling unit locations?

Accepted Answer

NEC 210.8(A)(6) requires GFCI protection for receptacles in dwelling unit kitchens (where serving countertop surfaces, and now generally all kitchen receptacles in 2023 update).

Question 2

For a dwelling unit, a receptacle installed in a finished basement must have GFCI protection.

Accepted Answer

NEC 210.8(A)(5) requires GFCI protection for all receptacles in basements of dwelling units, including both finished and unfinished basements. This requirement applies regardless of how the basement is used or finished. The 2020 NEC expanded this requirement to cover all basement receptacles, and the 2023 NEC retains this broader coverage.

Question 3

Which appliance requires GFCI protection regardless of whether it is hard-wired or cord-and-plug connected?

Accepted Answer

NEC 210.8(D) specifically lists dwelling unit dishwashers as requiring GFCI protection.

Question 4

Receptacles located outdoors at a dwelling unit must be GFCI protected. An exception applies to:

Accepted Answer

NEC 210.8(A)(3) Exception to (3): Receptacles that are not readily accessible and are supplied by a branch circuit dedicated to electric snow-melting, deicing, or pipeline and vessel heating equipment shall be permitted to be installed in accordance with 426.28 or 427.22, as applicable (which use GFPE, not Class A GFCI).

Question 5

AFCI protection is required for branch circuits supplying outlets in which of the following dormitory unit areas?

Accepted Answer

NEC 210.12(B) requires AFCI protection for outlets in dormitory unit bedrooms, living rooms, hallways, closets, and similar rooms.

Question 6

All 125V through 250V receptacles supplied by single-phase branch circuits rated 150V or less to ground installed in commercial kitchens must have GFCI protection. A 'kitchen' is defined as an area with a sink and:

Accepted Answer

NEC 210.8(B)(2) requires GFCI in non-dwelling unit kitchens. Article 100 defines a kitchen as an area with a sink and permanent provisions for food preparation and cooking.

Question 7

GFCI protection is required for outdoor outlets (not just receptacles) for dwelling units that are supplied by single-phase branch circuits rated 150V or less to ground and _____ or less.

Accepted Answer

NEC 210.8(F) requires GFCI protection for outdoor outlets (e.g., hardwired AC units) on dwelling units for circuits rated 50A or less.

Question 8

In a commercial building (non-dwelling), GFCI protection is required for receptacles in:

Accepted Answer

NEC 210.8(B)(1) requires GFCI protection for receptacles in bathrooms of other than dwelling units.

Question 9

Are GFCI receptacles permitted to be installed in a standard octagon box?

Accepted Answer

NEC 314.25 requires covers to be compatible with the box and device. A round/octagon box is permitted if a cover (mud ring/industrial cover) adapts it to the device.

Question 10

Vending machines connected by cord and plug must be:

Accepted Answer

NEC 422.51 requires cord-and-plug-connected vending machines to have GFCI protection (often integral to the cord, or via the receptacle).

Question 11

When replacing a receptacle in a location that now requires GFCI protection (but didn't when built), the replacement receptacle must be:

Accepted Answer

NEC 406.4(D)(3) requires that where a receptacle is replaced in a location where GFCI protection is currently required, the replacement must be GFCI protected.

Question 12

AFCI protection is required for which of the following locations in a Guest Room of a Hotel?

Accepted Answer

NEC 210.12(C) extends the AFCI requirements of dwelling units to guest rooms and guest suites of hotels and motels.

Question 13

Receptacles in crawl spaces at or below grade level require GFCI protection:

Accepted Answer

NEC 210.8(A)(4) (Dwellings) and 210.8(B)(9) (Other than dwellings) both require GFCI protection for crawl space receptacles.

Question 14

Electric drinking fountains connected by cord and plug require:

Accepted Answer

NEC 422.52 requires GFCI protection for electric drinking fountains.

Question 15

In a dwelling unit, a receptacle installed within _____ of the outside edge of a sink requires GFCI protection.

Accepted Answer

NEC 210.8(A)(7) requires GFCI protection for receptacles installed within 6 feet (1.8 m) of the top inside edge of the bowl of the sink.

Question 16

If a branch circuit is modified, replaced, or extended in a dwelling unit bedroom, AFCI protection must be provided if the extension is longer than:

Accepted Answer

NEC 210.12(D) Exception: AFCI is not required if the extension is less than 6 feet and does not include any additional outlets or devices. If > 6 ft or adding outlet, AFCI is required.

Question 17

Boat hoists installed at dwelling unit docking facilities must have:

Accepted Answer

NEC 210.8(F) (or formerly 210.8(C)) requires GFCI protection for outlets supplying boat hoists.

Question 18

In other than dwelling units, GFCI protection is required for indoor receptacles located within _____ of the outside edge of a bathtub or shower stall.

Accepted Answer

NEC 210.8(B)(11) requires GFCI protection for receptacles within 6 feet of the outside edge of the bathtub or shower stall in non-dwelling units (added in recent codes to match dwelling rules).

Question 19

Which method is permitted to provide AFCI protection?

Accepted Answer

NEC 210.12(A) allows multiple methods, including a Combination-Type AFCI breaker (A) or an Outlet Branch-Circuit AFCI receptacle (B) if the home run is protected (e.g., metal raceway or concrete encasement).

Question 20

High-pressure spray washing machines connected by cord and plug must have:

Accepted Answer

NEC 422.49 requires high-pressure spray washers to have a factory-installed GFCI (integral to the plug or cord).

Question 21

GFCI protection shall be provided for lighting outlets in crawl spaces.

Accepted Answer

NEC 210.8(C) requires GFCI protection for lighting outlets in crawl spaces (dwelling and non-dwelling).

Question 22

A receptacle for a gas range in a dwelling unit kitchen requires GFCI protection.

Accepted Answer

NEC 210.8(A)(6) requires GFCI protection for receptacles in kitchens. No exception exists for the range receptacle (gas ignition/clock). (Older codes limited it to countertops, current code is ALL kitchen receptacles).

Question 23

Tire inflation machines (automotive vacuum machines) provided for public use must be GFCI protected.

Accepted Answer

NEC 422.51 (and similar 422 sections) requires GFCI for tire inflation/vacuum machines for public use.

Question 24

Wall-mounted control units for in-floor radiant heating in bathrooms must be GFCI protected.

Accepted Answer

NEC 424.44(E) requires GFCI protection for the heating cables in floor heating systems installed in bathrooms, but this requirement applies to the heating element circuit, not to the wall-mounted control unit or thermostat itself. Unless the control unit incorporates a receptacle outlet or is otherwise covered by a separate GFCI requirement, the wall-mounted thermostat is not independently required to have GFCI protection.

Question 25

Sump pumps installed in dwelling unit basements require GFCI protection.

Accepted Answer

NEC 210.8(A)(5) requires GFCI protection for receptacles in basements. There is NO exception for sump pumps (single outlet exception was removed years ago).

Question 26

Three-phase receptacles (up to 250V) in commercial kitchens require GFCI protection.

Accepted Answer

NEC 210.8(B) requires GFCI for single-phase receptacles (50A or less) AND three-phase receptacles (100A or less) in locations like kitchens.

Question 27

A Class A ground-fault circuit interrupter (GFCI) is designed to trip when the ground-fault current reaches what range?

Accepted Answer

A Class A GFCI is designed to trip when the ground-fault current is 4 to 6 mA (nominally 5 mA). This threshold is set to protect people from electric shock and is the device referenced throughout NEC 210.8.

Question 28

Per NEC 210.8, 125-volt, 15- and 20-ampere receptacles installed in a dwelling-unit bathroom must have what protection?

Accepted Answer

NEC 210.8(A) requires GFCI protection for 125-volt, 15- and 20-ampere receptacles in dwelling bathrooms because of their proximity to water.

Question 29

NEC 210.8 requires GFCI protection for receptacles located within how many feet of the outside edge of a sink?

Accepted Answer

NEC 210.8 requires GFCI protection for 125-volt receptacles located within 6 feet of the outside edge of a sink, in addition to the specific room-based requirements.

Question 30

Which dwelling location requires GFCI protection for 125-volt, 15- and 20-ampere receptacles under NEC 210.8(A)?

Accepted Answer

NEC 210.8(A) lists unfinished basements among the dwelling areas requiring GFCI protection for 125-volt, 15- and 20-ampere receptacles.

Question 31

What type of fault is an arc-fault circuit interrupter (AFCI) designed to detect?

Accepted Answer

An AFCI detects dangerous arcing faults from damaged or loose wiring that can ignite fires. This differs from a GFCI, which detects ground-fault current to protect people from shock. AFCI requirements are found in NEC 210.12.

Question 32

NEC 210.12 requires AFCI protection for 120-volt branch circuits supplying outlets in which dwelling-unit areas?

Accepted Answer

NEC 210.12 requires AFCI protection for 120-volt, 15- and 20-ampere branch circuits supplying outlets and devices in dwelling-unit kitchens, bedrooms, living rooms, and most other habitable rooms.

Question 33

Receptacles serving dwelling kitchen countertop surfaces are required to have what protection?

Accepted Answer

NEC 210.8(A) requires GFCI protection for receptacles serving kitchen countertop surfaces in a dwelling because of their proximity to the sink and water.

Question 34

Which statement best describes the difference between GFCI and AFCI protection?

Accepted Answer

A GFCI protects people from shock by tripping on small ground-fault currents (4–6 mA). An AFCI protects against fire by detecting dangerous arcing in wiring. A dual-function breaker combines both.

Question 35

Per NEC 210.8(A), 125-volt, 15- and 20-ampere receptacles in a dwelling-unit garage require:

Accepted Answer

NEC 210.8(A) requires GFCI protection for 125-volt, 15- and 20-ampere receptacles in dwelling garages and accessory buildings. Older exceptions for dedicated appliance receptacles have largely been removed in recent code cycles.

Question 36

Under NEC 210.8(A), outdoor 125-volt, 15- and 20-ampere receptacles at a dwelling require what protection?

Accepted Answer

NEC 210.8(A) requires GFCI protection for outdoor 125-volt, 15- and 20-ampere receptacles at dwellings, since outdoor locations are exposed to moisture.

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