Mississippi Residential Electrician Examination

According to NEC 90.1(A), what is the stated purpose of the National Electrical Code?

• ATo serve as a design specification and instruction manual for untrained persons
• BThe practical safeguarding of persons and property from hazards arising from the use of e…
• CTo establish the most efficient and least-cost wiring methods for dwellings
• DTo set energy-conservation targets for residential electrical systems

Per NEC Article 100, a qualified person is one who has skills and knowledge related to the construction and operation of the electrical equipment and installations and who has also received:

• AA Mississippi contractor license, regardless of field training
• BSafety training to recognize and avoid the hazards involved
• CPermission from the utility to work on the load side of the meter
• DAt least 40 hours of first-aid instruction

A resistive baseboard heater draws current from a 240-volt circuit and has a measured resistance of 19.2 ohms. Using Ohm's law (I = E / R), what is the current?

• A8.0 amperes
• B10.0 amperes
• C12.5 amperes
• D19.2 amperes

A 120-volt branch circuit supplies a purely resistive load that draws 12.5 amperes. What is the power of the load (P = E × I)?

• A96 watts
• B1,200 watts
• C1,500 watts
• D3,000 watts

In a parallel 120-volt residential branch-circuit arrangement, which quantity is the same across each load?

• ACurrent through each load
• BResistance of each load
• CVoltage across each load
• DWattage of each load

Per NEC 90.4, who has the authority to interpret the Code rules, decide on approval of equipment and materials, and grant special permission?

• AThe licensed electrical contractor
• BThe authority having jurisdiction (AHJ)
• CThe National Fire Protection Association staff
• DThe electric utility meter department

Per NEC Article 100, a load is a continuous load when the maximum current is expected to continue for how long?

• A30 minutes or more
• B1 hour or more
• C2 hours or more
• D3 hours or more

Two resistive heating elements of 16 ohms and 8 ohms are connected in series to a 240-volt source. What is the circuit current?

• A10 amperes
• B15 amperes
• C20 amperes
• D30 amperes

A 240-volt, single-phase, 4,800-volt-ampere load operates at 100 percent power factor. What is the line current (I = VA / E)?

• A10 amperes
• B15 amperes
• C20 amperes
• D40 amperes

Using the conversion 1 horsepower = 746 watts, what is the output of a 2-horsepower motor in watts?

• A746 watts
• B1,000 watts
• C1,492 watts
• D2,000 watts

A 120-volt, 2-wire copper branch circuit supplies a 15-ampere load. The one-way conductor length is 75 feet and the conductors are 12 AWG (6,530 circular mils). Using VD = (2 × K × I × D) / CM and K = 12.9, the voltage drop is approximately:

• A2.2 volts
• B4.4 volts
• C6.6 volts
• D8.8 volts

Per NEC 200.6, a grounded conductor 6 AWG or smaller shall be identified by a continuous white or gray outer finish, or by:

• AA green finish or green with yellow stripes
• BThree continuous white or gray stripes along the conductor's entire length
• COrange tape at each termination only
• DA bare copper finish without insulation

Per NEC 110.14(C)(1)(a), unless the equipment is listed and identified otherwise, conductor terminations for circuits rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, shall be used with conductors rated:

• A60°C (140°F)
• B75°C (167°F)
• C90°C (194°F)
• D110°C (230°F)

A 120/240-volt dwelling panelboard has exposed live parts on the front and a concrete wall opposite the working space (Condition 2). Using NEC Table 110.26(A)(1) for 0 to 150 volts to ground — Condition 1 = 3 ft, Condition 2 = 3 ft, Condition 3 = 4 ft — what is the minimum depth of working space?

• A2 feet
• B2 1/2 feet
• C3 feet
• D3 1/2 feet

Per NEC 110.26(A)(2) and 110.26(A)(3), the working space in front of a dwelling panelboard shall be at least how wide and how high?

• A24 inches wide and 6 feet high
• B30 inches wide, or the width of the equipment, whichever is greater, and 6 1/2 feet high
• C36 inches wide and 7 feet high
• DThe width of the panelboard only, and 5 feet high

Per NEC 110.26(E)(1)(a), dedicated equipment space above a dwelling panelboard extends from the floor to a height of 6 feet above the equipment or to the structural ceiling, whichever is lower. Which installation is permitted in that dedicated space?

• AA foreign plumbing waste line crossing above the panel
• BAn HVAC supply duct installed immediately above the panel enclosure
• CElectrical raceways, cables, and equipment associated with the electrical installation
• DA gas appliance vent passing through the space above the panel

NEC 90.1(B) and 90.1(C) together make which statement about Code-compliant work?

• ACompliance with the NEC automatically produces an efficient, convenient, and adequate des…
• BThe NEC is a design specification that replaces manufacturer instructions
• CCompliance results in an installation that is essentially free from hazard but not necess…
• DThe NEC guarantees that a dwelling service will never need to be upgraded

A 240-volt, single-phase well-pump motor has a nameplate of 2,400 watts and a power factor of 0.80. What is the apparent power in volt-amperes (VA = W / PF)?

• A1,920 VA
• B2,400 VA
• C3,000 VA
• D4,800 VA

A 240-volt, 2-wire copper feeder supplies a 40-ampere load 180 feet from the service. The conductors are 8 AWG (16,510 circular mils). Using VD = (2 × K × I × D) / CM and K = 12.9, the voltage drop as a percent of 240 volts is approximately:

• A2.3 percent
• B3.0 percent
• C4.7 percent
• D6.2 percent

A 3-horsepower, 240-volt, single-phase motor has 80 percent efficiency and 85 percent power factor. Using I = (HP × 746) / (E × efficiency × PF), the line current is approximately:

• A9.3 amperes
• B12.5 amperes
• C13.7 amperes
• D16.2 amperes

A 120/240-volt multiwire branch circuit supplies 16 amperes of 120-volt load on Leg 1 and 10 amperes of 120-volt load on Leg 2. What is the current in the grounded (neutral) conductor?

• A0 amperes
• B6 amperes
• C16 amperes
• D26 amperes

Seven 10 AWG THHN copper current-carrying conductors are installed in one EMT. Use this snippet: Table 310.16 90°C ampacity for 10 AWG copper = 40 A; Table 310.15(C)(1) adjustment for 7–9 current-carrying conductors = 70 percent. What is the allowable ampacity of each 10 AWG conductor after adjustment, before comparing it with 240.4(D)?

• A21 amperes
• B28 amperes
• C30 amperes
• D40 amperes

Per NEC 230.79(C), the service disconnecting means for a one-family dwelling shall have a rating of not less than:

• A60 amperes, 3-wire
• B100 amperes, 3-wire
• C125 amperes, 3-wire
• D200 amperes, 3-wire

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

• AOne
• BTwo
• CThree
• DFour

Per NEC 210.11(C)(2), the laundry receptacle outlet(s) required by 210.52(F) shall be supplied by at least one 20-ampere branch circuit that:

• AMay also supply the kitchen lighting
• BShall have no other outlets
• CMay also supply bedroom receptacles
• DMust be a multiwire 240-volt circuit

Per NEC 210.11(C)(3), at least one 20-ampere branch circuit shall supply bathroom receptacle outlet(s) required by 210.52(D). That circuit:

• AShall have no other outlets, except that a circuit serving a single bathroom may also sup…
• BMust also supply the hallway lighting
• CMay supply kitchen countertop receptacles
• DIs permitted to be rated 15 amperes if GFCI protected

Per NEC Table 220.12, the general lighting load for dwelling occupancies is calculated at:

• A1 volt-ampere per square foot
• B2 volt-amperes per square foot
• C3 volt-amperes per square foot
• D5 volt-amperes per square foot

Per NEC 210.52(A)(1), receptacle outlets in dwelling habitable rooms shall 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

Per NEC 210.52(E)(1), a one-family dwelling shall have at least one receptacle outlet readily accessible from grade and not more than 6 1/2 feet above grade at which outdoor locations?

• AThe front of the dwelling only
• BThe back of the dwelling only
• CBoth the front and the back of the dwelling
• DOnly at the air-conditioning equipment

Per NEC 220.52(A) and 220.52(B), how many volt-amperes are included in a dwelling service calculation for the two required small-appliance branch circuits plus the required laundry branch circuit?

• A1,500 VA
• B3,000 VA
• C4,500 VA
• D6,000 VA

Per NEC 210.52(B)(2), the small-appliance branch circuits required by 210.52(B)(1) shall serve the kitchen, pantry, breakfast, and dining receptacle outlets and shall serve no other outlets. Which load is therefore not permitted on those circuits?

• AA wall clock outlet under the 210.52(B)(2) Exception No. 1
• BA refrigeration equipment receptacle under the 210.52(B)(2) Exception No. 2
• CKitchen lighting outlets
• DAn additional kitchen countertop receptacle

Per NEC 210.52(B)(3), receptacle outlets installed in a dwelling kitchen to serve countertop surfaces shall be supplied by:

• AA single 15-ampere general lighting circuit
• BNot fewer than two small-appliance branch circuits
• CThe bathroom 20-ampere circuit
• DThe laundry 20-ampere circuit

Per NEC 210.11(C)(4), at least one 120-volt, 20-ampere branch circuit shall be installed to supply receptacle outlets required by 210.52(G)(1) in attached garages and in detached garages with electric power. That circuit:

• AShall have no other outlets, except it may supply readily accessible outdoor receptacle o…
• BMust also supply the kitchen small-appliance receptacles
• CMay be rated 15 amperes if the garage has only one vehicle bay
• DIs not required if a GFCI receptacle is installed on a lighting circuit

Per NEC 2020 210.8(A), which dwelling receptacle location requires GFCI protection?

• AA 125-volt receptacle serving a bedroom nightstand, 10 feet from any sink
• BA 125-volt receptacle installed in an unfinished basement
• CA 125-volt receptacle in a finished living room with no sink
• DA 125-volt receptacle in a dry, finished hallway

Per NEC 2020 210.12(A), AFCI protection is required for 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices in which dwelling location?

• ABathrooms
• BAttached garages
• CBedrooms
• DOutdoor receptacles at grade

A 125-volt, 20-ampere receptacle is installed in a dwelling kitchen to serve the countertop. Per NEC 2020 210.8(A)(6) and 210.12(A), which protection is required?

• AGFCI protection only
• BAFCI protection only
• CBoth GFCI and AFCI protection
• DNeither GFCI nor AFCI protection if the receptacle is tamper-resistant

A 125-volt, 20-ampere receptacle is installed on the wall adjacent to a dwelling bathroom basin. Which statement matches NEC 2020 210.8(A) and 210.12(A)?

• AGFCI protection is required; AFCI protection is not required by 210.12(A) because bathroo…
• BAFCI protection is required and GFCI protection is not
• CNeither GFCI nor AFCI protection is required
• DOnly a dual-function breaker may be used; a GFCI receptacle is prohibited

NEC Table 220.42 demand factors for dwelling-unit lighting loads are: first 3,000 VA at 100 percent, remainder at 35 percent. After adding general lighting, small-appliance, and laundry loads, a dwelling has 9,000 VA in that category. What demand load is used?

• A3,000 VA
• B5,100 VA
• C6,150 VA
• D9,000 VA

Using NEC Table 220.55 Column C, the demand load for one household electric range rated 12 kW or less is 8 kW. What demand load is used for a single 12 kW range on a dwelling service calculation?

• A8,000 VA
• B10,000 VA
• C12,000 VA
• D15,000 VA

Per NEC 220.54, the load for a household electric clothes dryer in a dwelling-unit feeder or service calculation shall be the larger of 5,000 watts or the nameplate rating. A dryer nameplate is 4,500 watts. What load is used?

• A4,500 VA
• B5,000 VA
• C5,625 VA
• D8,000 VA

Per NEC 2020 230.85, for one- and two-family dwelling units, all service conductors shall terminate in a disconnecting means that has an adequate short-circuit current rating and is installed in which location?

• AAny location inside the dwelling that the homeowner prefers
• BA readily accessible outdoor location
• COnly inside the garage, behind stored items
• DOn the utility pole, controlled solely by the serving utility

Per NEC 230.24(B)(2), overhead service conductors not exceeding 300 volts to ground that pass over a residential driveway shall have a vertical clearance above grade of not less than:

• A8 feet
• B10 feet
• C12 feet
• D18 feet