Residential Electrical Inspector/ Electrical
{National Electrical Code} Competency Study Guide
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. Conductors used to conduct current shall be of _______ except as
otherwise provided in chapters 34 through 43. - Correct Answer:
Copper-clad aluminum or copper-aluminum.
2. The minimum size of electrical conductors for feeders and branch circuits,
when of copper, shall be _______. - Correct Answer: 14 AWG.
For aluminum or copper-clad aluminum the minimum size is 12 AWG.
3. Where installed in raceways, conductors _______ and larger shall be
stranded. - Correct Answer: 8 AWG.
4. How many strands does a 12 AWG copper Class B conductor have? -
Correct Answer: 7.
5. Where electrical conductors are to be spliced, terminated or connected to
fixtures or devices, a minimum length of _______ of free conductor shall be
, provided at each outlet, junction or switch point. - Correct Answer: 6
inches.
6. Insulated grounded conductors of sizes 6 AWG and smaller shall be
identified by a ______. - Correct Answer: Continuous white or gray
outer finish, or by three continuous white or gray stripes on other than
green insulation along the entire length of the conductors.
7. Individually covered or insulated equipment grounding conductors of the
wire type shall have a continuous outer finish that is either green color or
green color with one or more _______ on the insulation or covering. -
Correct Answer: Yellow stripes.
8. Conductors with insulation or individual covering that is green, green with
one or more yellow stripes, or otherwise identified as permitted by this
section shall not be used for _______. - Correct Answer: Ungrounded or
grounded circuit conductors.
9. Insulation on ungrounded conductors shall be a continuous color other than
______. Exception ignored. - Correct Answer: White, gray or green.
10.Meaning all circuit conductors between service equipment, or the source of
a separately derived system, or other power supply source and the final
branch-circuit overcurrent device. - Correct Answer: Feeder.
,11.Meaning not readily accessible to persons unless special means for access
are used. - Correct Answer: Isolated.
12.Meaning the common point on a wye connection in a polyphase system or
midpoint on a single-phase, 3-wire system, or midpoint of a single-phase
portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current
system. - Correct Answer: Neutral Point.
13.Meaning the underground service conductors between the electric utility
supply system and the service point. - Correct Answer: Service lateral.
14.Meaning constructed or protected so that exposure to the weather will not
interfere with successful operation. - Correct Answer: Weatherproof.
15.One and two family dwellings shall be supplied by _______. - Correct
Answer: Only one service.
16.___________ supplying a building or other structure shall not pass through
the interior of another building or other structure. - Correct Answer:
Service conductors.
17.Means shall be provided to ___________ all ungrounded conductors in a
build or other structure from the service entrance conductors. - Correct
Answer: Disconnect.
, 18.Ungrounded service conductors shall have an ampacity of not less than the
load served. For one-family dwellings, the ampacity of the ungrounded
conductors shall be not less than _______. For all other installations, the
ampacity shall be not less than _______. - Correct Answer: 100
amperes, three wire. 60 amperes.
19.For a 100 to 400-amp service supplying the entire load of a single-family
home or an individual unit in a two-family home, the service conductors
must have an ampacity of not less than _______ percentage of the service
rating. - Correct Answer: 83%.
20.For a 200-ampere service, what size shall the conductor be if it's made of
copper-clad aluminum? - Correct Answer: 4/0 AWG.
21.For limited loads of a single branch circuit, the service conductors shall have
an ampacity of not less than? - Correct Answer: 15 amps.
22.What size of grounding electrode conductor do you need if the largest
ungrounded service-entrance conductor is 3/0 AWG copper-clad
aluminum? - Correct Answer: Either 6 AWG copper or 4 AWG of
aluminum or copper-clad aluminum.
23.Open conductors and multiconductor cables without an overall outer jacket
shall have a minimum clearance of _______ from the sides of doors,
{National Electrical Code} Competency Study Guide
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. Conductors used to conduct current shall be of _______ except as
otherwise provided in chapters 34 through 43. - Correct Answer:
Copper-clad aluminum or copper-aluminum.
2. The minimum size of electrical conductors for feeders and branch circuits,
when of copper, shall be _______. - Correct Answer: 14 AWG.
For aluminum or copper-clad aluminum the minimum size is 12 AWG.
3. Where installed in raceways, conductors _______ and larger shall be
stranded. - Correct Answer: 8 AWG.
4. How many strands does a 12 AWG copper Class B conductor have? -
Correct Answer: 7.
5. Where electrical conductors are to be spliced, terminated or connected to
fixtures or devices, a minimum length of _______ of free conductor shall be
, provided at each outlet, junction or switch point. - Correct Answer: 6
inches.
6. Insulated grounded conductors of sizes 6 AWG and smaller shall be
identified by a ______. - Correct Answer: Continuous white or gray
outer finish, or by three continuous white or gray stripes on other than
green insulation along the entire length of the conductors.
7. Individually covered or insulated equipment grounding conductors of the
wire type shall have a continuous outer finish that is either green color or
green color with one or more _______ on the insulation or covering. -
Correct Answer: Yellow stripes.
8. Conductors with insulation or individual covering that is green, green with
one or more yellow stripes, or otherwise identified as permitted by this
section shall not be used for _______. - Correct Answer: Ungrounded or
grounded circuit conductors.
9. Insulation on ungrounded conductors shall be a continuous color other than
______. Exception ignored. - Correct Answer: White, gray or green.
10.Meaning all circuit conductors between service equipment, or the source of
a separately derived system, or other power supply source and the final
branch-circuit overcurrent device. - Correct Answer: Feeder.
,11.Meaning not readily accessible to persons unless special means for access
are used. - Correct Answer: Isolated.
12.Meaning the common point on a wye connection in a polyphase system or
midpoint on a single-phase, 3-wire system, or midpoint of a single-phase
portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current
system. - Correct Answer: Neutral Point.
13.Meaning the underground service conductors between the electric utility
supply system and the service point. - Correct Answer: Service lateral.
14.Meaning constructed or protected so that exposure to the weather will not
interfere with successful operation. - Correct Answer: Weatherproof.
15.One and two family dwellings shall be supplied by _______. - Correct
Answer: Only one service.
16.___________ supplying a building or other structure shall not pass through
the interior of another building or other structure. - Correct Answer:
Service conductors.
17.Means shall be provided to ___________ all ungrounded conductors in a
build or other structure from the service entrance conductors. - Correct
Answer: Disconnect.
, 18.Ungrounded service conductors shall have an ampacity of not less than the
load served. For one-family dwellings, the ampacity of the ungrounded
conductors shall be not less than _______. For all other installations, the
ampacity shall be not less than _______. - Correct Answer: 100
amperes, three wire. 60 amperes.
19.For a 100 to 400-amp service supplying the entire load of a single-family
home or an individual unit in a two-family home, the service conductors
must have an ampacity of not less than _______ percentage of the service
rating. - Correct Answer: 83%.
20.For a 200-ampere service, what size shall the conductor be if it's made of
copper-clad aluminum? - Correct Answer: 4/0 AWG.
21.For limited loads of a single branch circuit, the service conductors shall have
an ampacity of not less than? - Correct Answer: 15 amps.
22.What size of grounding electrode conductor do you need if the largest
ungrounded service-entrance conductor is 3/0 AWG copper-clad
aluminum? - Correct Answer: Either 6 AWG copper or 4 AWG of
aluminum or copper-clad aluminum.
23.Open conductors and multiconductor cables without an overall outer jacket
shall have a minimum clearance of _______ from the sides of doors,
