NEC 2017 JOURNEYMAN STUDY GUIDE EXAM QUESTION
WITH ANSWERS 2025/2026 GRADED A+
Service drop conductors shall maintain _____ clearance from the sides and bottoms of
operable windows. - 3', 225.19(D)(1),230.9(A)
Overhead service drop conductors shall not be smaller than _____ away copper wire. -
8, 230.23(B)
According to the NEC, service drop conductors (600v or less) must be _____ above
finish grade. - 10',230.24(B)(1)
What is the overhead clearance for service conductors 600 volts and less going over a
residential property? - 12', 230.24(B)(2)
Service entrance cables shall be supported by approached means within ____ ft of
every service head and at intervals not exceeding _____ ft. - 12", 30", 230.51(A)
Cable limiters are not permitted to be connected to the supply side of the service
disconnecting means. T/F - False, 230.82(1)
What is the maximum size fuse that can be installed for a #18 fixture wire and be
considered protected? - 20, 240.5(B)(2)
Type S adapters shall be designed so that once inserted in a fuse holder, they ____. -
Cannot be removed, 240.54(C)
What is the minimum spacing between grounding electrodes? - 6', 250.53(B)
In a building where a metal underground water line is available, the maximum size of
the grounding electrode conductor for an ungrounded system with 3/0 copper service
conductors shall be? - #4 AWG copper, 250.66
Interior metal water piping located not more than ____ from the point of entrance to a
building shall be permitted to be used as a conductor to interconnect electrodes that are
part of the grounding system. - 5', 250.68(C)
What is the minimum size grounded conductor permitted to be installed when the
ungrounded conductors are size 1/0 copper? - #6 AWG copper, Table 250.102(C)(1)
A conductor intended solely for the purposes of grounding shall be either bare or color
coded ______ or _______. - Green, Green with a yellow stripe, 250.119
Where metal fences are located within ____ft of the electrical conductors or equipment,
the fence shall be bonded. - 16', 250.194(A)
, Underground service conductors not encased in concrete shall be identified by a
warning ribbon _____ inches above the underground installation. - 12", 300.4(D)(3)
Where raceways contain ____ AWG or larger insulated conductors that enter a box the
conductors shall be protected by a bushing. - 4AWG, 300.4(G)
Residential direct burial branch circuits rated 120V or less with GFCI protection and a
maximum over current protection of 20A shall have a minimum cover requirement of __
inches. - 12, Table 300.5
Direct buried service conductors, 1000V and less, shall have a minimum cover of ___
inches of dirt. - 24", Table 300.5
The free length of conductors at each outlet and switch point for connecting to devices
is ___ inches. - 6", 300.14
Four #10 THHN, copper, current carrying conductors are installed in the same EMT in a
e being temperature of 30*C. the allowable ampacity of each of the conductors is ___
amps. - 32, Table 310.15(B)(3)(a), Table 310.15(B)(16)
For a 150a dwelling unit service what is the demand factor? - 83% 310.15(B)(7)
The capacity of a #10 TW not more than 3 wires when installed on a conduit or cable is
___ amps. - 30, Table 310.15(B)(16)
What is the amperage rating of a #2 FEPB cable? - 293A, 310.15(B)(19)
What is the wire size range for type XHH cable with 45 mil insulation? - 8-2AWG, Table
310.104(A)
Conductors ____ and larger must be stranded. - 8AWG, 310.106(C)
Size approved drainage openings shall be permitted to be installed in conduit bodies
used in wet locations. - Not larger than 1/4", 314.15
What trade size round/octagonal box has a minimum of 21.5in^2? - 4 x 2 1/8" round ,
octagonal, Table 314.16(A)
What is the minimum volume of a box trade size (4x 2 1/8 x 1 1/2) - 10.3"^3, Table
314.16(A)
What is the volume allowance for #18AWG conductor? - 1.5 in^3, Table 314.16(B)
When determining the numbers of wires in a box for box fill, a conductor passing
through the box without a splice or tap with a conductor loop less than 12" is counted as
___. - One volume allowance, 314.16(B)(1)
WITH ANSWERS 2025/2026 GRADED A+
Service drop conductors shall maintain _____ clearance from the sides and bottoms of
operable windows. - 3', 225.19(D)(1),230.9(A)
Overhead service drop conductors shall not be smaller than _____ away copper wire. -
8, 230.23(B)
According to the NEC, service drop conductors (600v or less) must be _____ above
finish grade. - 10',230.24(B)(1)
What is the overhead clearance for service conductors 600 volts and less going over a
residential property? - 12', 230.24(B)(2)
Service entrance cables shall be supported by approached means within ____ ft of
every service head and at intervals not exceeding _____ ft. - 12", 30", 230.51(A)
Cable limiters are not permitted to be connected to the supply side of the service
disconnecting means. T/F - False, 230.82(1)
What is the maximum size fuse that can be installed for a #18 fixture wire and be
considered protected? - 20, 240.5(B)(2)
Type S adapters shall be designed so that once inserted in a fuse holder, they ____. -
Cannot be removed, 240.54(C)
What is the minimum spacing between grounding electrodes? - 6', 250.53(B)
In a building where a metal underground water line is available, the maximum size of
the grounding electrode conductor for an ungrounded system with 3/0 copper service
conductors shall be? - #4 AWG copper, 250.66
Interior metal water piping located not more than ____ from the point of entrance to a
building shall be permitted to be used as a conductor to interconnect electrodes that are
part of the grounding system. - 5', 250.68(C)
What is the minimum size grounded conductor permitted to be installed when the
ungrounded conductors are size 1/0 copper? - #6 AWG copper, Table 250.102(C)(1)
A conductor intended solely for the purposes of grounding shall be either bare or color
coded ______ or _______. - Green, Green with a yellow stripe, 250.119
Where metal fences are located within ____ft of the electrical conductors or equipment,
the fence shall be bonded. - 16', 250.194(A)
, Underground service conductors not encased in concrete shall be identified by a
warning ribbon _____ inches above the underground installation. - 12", 300.4(D)(3)
Where raceways contain ____ AWG or larger insulated conductors that enter a box the
conductors shall be protected by a bushing. - 4AWG, 300.4(G)
Residential direct burial branch circuits rated 120V or less with GFCI protection and a
maximum over current protection of 20A shall have a minimum cover requirement of __
inches. - 12, Table 300.5
Direct buried service conductors, 1000V and less, shall have a minimum cover of ___
inches of dirt. - 24", Table 300.5
The free length of conductors at each outlet and switch point for connecting to devices
is ___ inches. - 6", 300.14
Four #10 THHN, copper, current carrying conductors are installed in the same EMT in a
e being temperature of 30*C. the allowable ampacity of each of the conductors is ___
amps. - 32, Table 310.15(B)(3)(a), Table 310.15(B)(16)
For a 150a dwelling unit service what is the demand factor? - 83% 310.15(B)(7)
The capacity of a #10 TW not more than 3 wires when installed on a conduit or cable is
___ amps. - 30, Table 310.15(B)(16)
What is the amperage rating of a #2 FEPB cable? - 293A, 310.15(B)(19)
What is the wire size range for type XHH cable with 45 mil insulation? - 8-2AWG, Table
310.104(A)
Conductors ____ and larger must be stranded. - 8AWG, 310.106(C)
Size approved drainage openings shall be permitted to be installed in conduit bodies
used in wet locations. - Not larger than 1/4", 314.15
What trade size round/octagonal box has a minimum of 21.5in^2? - 4 x 2 1/8" round ,
octagonal, Table 314.16(A)
What is the minimum volume of a box trade size (4x 2 1/8 x 1 1/2) - 10.3"^3, Table
314.16(A)
What is the volume allowance for #18AWG conductor? - 1.5 in^3, Table 314.16(B)
When determining the numbers of wires in a box for box fill, a conductor passing
through the box without a splice or tap with a conductor loop less than 12" is counted as
___. - One volume allowance, 314.16(B)(1)
