New Mexico CID ER-1 Residential Electrical Wiring Examination

According to NEC Article 100, a device is a unit of an electrical system that is intended to:

• AUtilize electrical energy, such as a luminaire or appliance
• BCarry or control electric energy but not utilize it
• CConvert electrical energy to mechanical energy only
• DProtect conductors from overcurrent exclusively

In NEC 2020, the word “shall” identifies a rule that is:

• AAdvisory commentary only
• BPermissive and optional
• CMandatory
• DLimited to Informational Notes

For dwelling-unit panelboards operating at 150 volts to ground or less, NEC 110.26(A) generally requires a working space of not less than:

• A2 feet deep, 24 inches wide, and 6 feet high
• B3 feet deep, 30 inches wide, and 6½ feet high
• C4 feet deep, 36 inches wide, and 7 feet high
• D3 feet deep, 36 inches wide, and 8 feet high

Unless the equipment is listed and identified for use at 75°C, conductor ampacity at terminations rated 100 amperes or less is generally selected from which column of Table 310.16?

• A60°C column
• B75°C column
• C90°C column
• D110°C column

Listed or labeled equipment must be installed and used in accordance with:

• AAny field modification the installer prefers
• BAny instructions included in the listing or labeling
• CManufacturer marketing literature only
• DInformational Notes in Article 90 only

NEC 2020 210.8(A) requires GFCI protection for dwelling-unit receptacles in the listed locations when those receptacles are:

• A15-ampere, 125-volt only
• B125-volt through 250-volt, supplied by single-phase branch circuits rated 150 volts or le…
• C480-volt three-phase receptacles only
• DLighting outlets only

All 125-volt through 250-volt receptacles installed in a dwelling-unit bathroom must have GFCI protection. The GFCI device itself must be:

• AInstalled only in the attic
• BReadily accessible
• CLocated outdoors
• DOmitted if the bathroom has a window

NEC 2020 210.8(F) requires GFCI protection for outdoor outlets at dwellings that are 150 volts to ground or less and 50 amperes or less. New Mexico’s electrical code adds which outdoor-outlet exception?

• AAll outdoor lighting outlets are exempt
• BGFCI protection shall not be required for listed HVAC equipment
• CAny outdoor receptacle more than 3 feet above grade is exempt
• DOnly 240-volt outdoor outlets require GFCI

NEC 2020 210.12(A) requires AFCI protection for 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices in dwelling-unit:

• ABathrooms, garages, and outdoors only
• BKitchens, family rooms, dining rooms, living rooms, bedrooms, closets, hallways, laundry…
• CService-entrance conductors only
• DPool pump motors only

In dwelling units, 15- and 20-ampere, 125- and 250-volt nonlocking receptacles are generally required to be:

• AIsolated-ground type
• BTamper-resistant
• CHospital-grade only
• DTwist-lock type

In dwelling-unit habitable rooms, receptacle outlets must be installed so that no point measured horizontally along the floor line of any wall space is more than:

• A4 feet from a receptacle outlet
• B6 feet from a receptacle outlet
• C8 feet from a receptacle outlet
• D12 feet from a receptacle outlet

For dwelling-unit receptacle spacing, “wall space” includes any space that is:

• A6 inches or more in width
• B2 feet or more in width
• C4 feet or more in width
• DOnly unbroken walls with no openings

Along a dwelling-unit kitchen wall countertop, receptacle outlets must be installed so that no point along the wall line is more than:

• A12 inches from a receptacle outlet
• B20 inches from a receptacle outlet
• C24 inches from a receptacle outlet
• D6 feet from a receptacle outlet

In a dwelling-unit bathroom, at least one receptacle outlet must be installed within what distance of the outside edge of each basin?

• A12 inches
• B3 feet
• C6 feet
• D10 feet

For a one-family dwelling, outdoor receptacle outlets required by 210.52(E)(1) include:

• AOne receptacle at the front only
• BAt least one receptacle outlet accessible from grade at the front and one at the back, no…
• COne rooftop receptacle only
• DNo outdoor receptacles if the garage has power

In a dwelling-unit attached garage, NEC 210.52(G)(1) requires at least one receptacle outlet:

• AOn the ceiling for the door opener only
• BIn each vehicle bay and not more than 5½ feet above the floor
• CWithin 12 inches of the floor in one bay only
• DOnly if an electric vehicle charger is installed

The grounded conductor of a 120-volt branch circuit is generally identified by a continuous:

• AGreen or green-with-yellow-stripe finish, or by being bare
• BWhite or gray finish, or by three continuous white stripes on other than green insulation
• COrange finish
• DRed finish

Where a snap switch controls lighting loads supplied by a grounded general-purpose branch circuit, NEC 404.2(C) generally requires:

• AAn equipment grounding conductor only, with no grounded conductor at the switch
• BA grounded conductor at the switch location
• CA dedicated 30-ampere switch loop
• DThat the switch be a 4-way only

The dedicated equipment space above a dwelling panelboard, required by NEC 110.26(E)(1), extends from the floor to a height of:

• A6 feet above the floor or the top of the equipment, whichever is lower
• B6 feet above the equipment or to the structural ceiling, whichever is lower
• C10 feet above the floor in all cases
• DThe working-space depth only, with no height component

A 15- or 20-ampere, 125- or 250-volt receptacle installed in a wet location must be:

• AA weather-resistant type and provided with an enclosure that is weatherproof whether or n…
• BAny indoor receptacle under a standard flip cover
• CA locking-type receptacle with no cover
• DInstalled without a cover if GFCI protected

NEC 110.14(D) requires that listed or labeled equipment be tightened to the indicated torque using a:

• ACalibrated torque tool
• BStandard screwdriver “until tight”
• CHammer and punch only
• DChannel-lock pliers on the screw head

NEC 210.11(C)(1) requires a dwelling unit to have at least how many 20-ampere small-appliance branch circuits?

• AOne
• BTwo or more
• CFour
• DNone if the kitchen is all-gas

A 20-ampere small-appliance branch circuit required by 210.11(C)(1) is generally permitted to supply:

• AKitchen lighting and the dining-room chandelier
• BReceptacle outlets in the kitchen, pantry, breakfast room, dining room, or similar area,…
• CThe laundry receptacle and outdoor receptacles
• DA hard-wired water heater

In addition to other required circuits, a dwelling unit must have at least one 20-ampere branch circuit to supply:

• AOnly hallway lighting
• BThe laundry receptacle outlet(s) required by 210.52(F), with no other outlets
• CThe doorbell transformer
• DAll bedroom receptacles

A 20-ampere bathroom branch circuit supplies the basin receptacle and a 9-ampere cord-and-plug exhaust fan in Bathroom A, and also supplies the basin receptacle in Bathroom B. Which statement is correct under NEC 210.11(C)(3) and 210.23(A)?

• AThe installation is acceptable because both rooms are bathrooms
• BThe installation violates 210.11(C)(3): the exception that allows other equipment on the…
• CThe fan is permitted if it is GFCI protected, regardless of how many bathrooms share the…
• DTwo bathrooms may share lighting and receptacles on any 15-ampere circuit

NEC 2020 210.11(C)(4) requires at least one 120-volt, 20-ampere branch circuit to supply the garage receptacle outlets required by 210.52(G)(1). That circuit:

• AMay also supply indoor lighting and bedroom receptacles
• BShall have no other outlets, except it may supply readily accessible outdoor receptacle o…
• CMust be 30 amperes
• DIs required only for detached garages

For a one-family dwelling, the service disconnecting means must have a rating of not less than:

• A60 amperes
• B100 amperes
• C150 amperes
• D200 amperes

NEC 2020 230.85 requires that for one- and two-family dwellings, all service conductors terminate in a disconnecting means that is:

• AInstalled only in the basement stairwell
• BInstalled in a readily accessible outdoor location and has a short-circuit current rating…
• CPermitted to be a pullout fuse holder in a clothes closet
• DRequired only when the service is larger than 400 amperes

NEC 2020 230.67 requires all services supplying dwelling units to be provided with a surge-protective device (SPD) that is:

• AA Type 3 point-of-use strip only
• BA Type 1 or Type 2 SPD, as an integral part of the service equipment or located immediate…
• COptional if the dwelling has no electronics
• DRequired only on feeders, never on services

A 2,400 sq ft dwelling has a 3 VA/sq ft general lighting load plus two small-appliance circuits and one laundry circuit at 1,500 VA each. After applying NEC 220.42, the general lighting and receptacle demand is:

• A11,700 VA
• B6,045 VA
• C3,000 VA
• D8,190 VA

In the standard dwelling-unit load calculation, each required 20-ampere small-appliance or laundry branch circuit is included at:

• A1,200 VA
• B1,500 VA
• C1,800 VA
• D2,400 VA

Under the NEC 220.82 optional method for a dwelling unit served by a 120/240-volt, 3-wire, 100-ampere or larger service, the general calculated load is:

• A100 percent of all connected loads with no demand factor
• B100 percent of the first 10 kVA plus 40 percent of the remainder of the 220.82(B) loads
• C35 percent of the entire connected load
• D75 percent of all fastened-in-place appliances including the range and dryer

Using NEC Table 220.55, what demand is used for one 14 kW household electric range in the standard dwelling calculation?

• A14,000 VA
• B8,000 VA
• C8,800 VA
• D12,000 VA

A dwelling has four fastened-in-place appliances other than a range, clothes dryer, space-heating equipment, or air conditioner: a 4,500 VA water heater, 1,200 VA dishwasher, 800 VA disposer, and 1,000 VA microwave. The standard-method demand for these four appliances is:

• A7,500 VA
• B5,625 VA
• C4,500 VA
• D8,500 VA

NEC 2020 230.71 still permits up to six service disconnects for a service, but those disconnects must be:

• ASix breakers in a single enclosure with no barriers, as in a traditional “six-pack”
• BArranged as separate enclosures, separate panelboard enclosures, barriered switchboard se…
• CLocated in different buildings without grouping
• DLimited to two-family dwellings only

A kitchen has two required 20-ampere small-appliance circuits feeding countertop receptacles, a 15-ampere individual circuit to a refrigerator receptacle only, and a clock-hanger receptacle on one small-appliance circuit. Which statement is correct?

• AThe refrigerator must be moved onto a small-appliance circuit; an individual 15-ampere ci…
• BThe refrigerator on an individual 15-ampere or larger circuit is permitted by 210.52(B)(1…
• CThe clock receptacle is an illegal “other outlet” in all cases
• DBoth exceptions are void if the kitchen also has a gas range

Using the standard method, calculate the service load for a 2,000 sq ft, 120/240-volt dwelling with two small-appliance circuits, one laundry circuit, a 12 kW range, a 5,500 VA dryer, a 4,500 VA water heater, a 1,200 VA dishwasher, a 1,000 VA disposer, and a 6,000 VA air conditioner (no electric heat). The calculated load is:

• A38,700 VA
• B31,825 VA
• C25,880 VA
• D28,225 VA

For a 200-ampere, 120/240-volt, single-phase service supplying the entire load of a one-family dwelling, NEC 310.12 permits the ungrounded service conductors to have an ampacity of not less than 83 percent of 200 amperes. If no adjustment or correction is required, Table 310.12 copper size is:

• A1 AWG copper
• B2/0 AWG copper
• C4/0 AWG copper
• D4 AWG copper

Service-entrance conductors must have an ampacity not less than the maximum load to be served and, for loads consisting of 3-wire, 120/240-volt, single-phase dwelling services, not less than the rating of the service disconnecting means, except as permitted in 310.12. Continuous loads must be calculated at:

• A80 percent of the continuous load only
• B100 percent of the noncontinuous load plus 125 percent of the continuous load
• C150 percent of all loads
• D50 percent of the service rating

A 12 kW, 120/240-volt household electric range is the only cooking appliance on its branch circuit. Using Table 220.55 Column C (8 kW demand) for conductor ampacity and 210.19(A)(3) for the minimum circuit rating, the branch circuit must be at least:

• A30 amperes, with 10 AWG copper conductors
• B40 amperes, with conductors rated not less than 40 amperes (typically 8 AWG copper)
• C50 amperes, because 12,000 VA ÷ 240 V = 50 A
• D20 amperes on a small-appliance circuit

In the standard dwelling calculation, the load for a household electric clothes dryer is the larger of the nameplate rating and:

• A3,000 VA
• B5,000 VA
• C8,000 VA
• DThe small-appliance circuit load

Using the 220.82 optional method, calculate the load for a 2,000 sq ft, 120/240-volt dwelling with two small-appliance circuits, one laundry circuit, a 12 kW range, a 5,500 VA dryer, a 4,500 VA water heater, a 1,200 VA dishwasher, a 1,000 VA disposer, and a 6,000 VA air conditioner (no electric heat).

• A34,700 VA
• B25,880 VA
• C19,880 VA
• D31,825 VA

Unless specifically permitted in 240.4(E) or (G), the overcurrent protection for 14 AWG, 12 AWG, and 10 AWG copper conductors shall not exceed:

• A20 A, 25 A, and 40 A, respectively
• B15 A, 20 A, and 30 A, respectively
• C15 A, 15 A, and 20 A, respectively
• D25 A, 30 A, and 40 A, respectively

Overcurrent devices for dwelling-unit branch circuits shall not be located:

• AIn a readily accessible panelboard in a utility room
• BIn bathrooms, over the steps of a stairway, or where exposed to easily ignitible material…
• CIn an attached garage if GFCI protected
• DWithin 6 feet of a kitchen sink

Where the ampacity of a conductor does not correspond to a standard overcurrent device rating listed in 240.6(A), and the conductor is not part of a multioutlet branch circuit supplying receptacles for cord-and-plug-connected portable loads, 240.4(B) generally permits the next higher standard rating if the rating does not exceed:

• A200 amperes
• B400 amperes
• C800 amperes
• D1000 amperes