Journeyman Electrician License Prep Test
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Where K=12.9, what is the approximate voltage-drop on a circuit where an
80-ampere, 240-volt, single-phase load is supplied with size 3 AWG copper
conductors with THWN insulation, and placed 200 feet from a panelboard?
*Chapter 9 tables, table 8 conductor properties
(pg. 70-689) - Answer--7.84 volts
voltage-drop formula
VD=2KID VD=2 x 12.9 x 80amps x 200ft. =7.84
CM 52.620 CM
Given the following information, what is the maximum approximate distance a
single-phase, 240-volt, 42-ampere load can be located from a panelboard?
*copper conductors - K = 12.9
*size 8 AWG THWN/THHN conductors are used
*limit voltage drop to 3%
*Chapter 9 tables, table 8 conductor properties
(pg. 70-689) - Answer--50 feet
Distance formula
1st. find allowable VD - 240volts x 3% = 7.2volts
D=CM x VD
D=16,510 x 7.2=118,872=109.7feet
2 x K X I 2 X 12.9 X 42
What is the minimum allowable trade size intermediate metal conduit (IMC) required
to contain a total of ten (10) copper THW conductors in a 20ft run, five (5) size 1
AWG and five (5) size 3 AWG?
*(Pg. 70-684) - Answer--2-1/2 Inches
, size 1 AWG THW=.1901 sq. in. x 5=.9505 sq. in.
size 3 AWG THW=.1134 SQ. IN. x 5=.537 sq. in.
total=1.5175 sq. in.
*NOTE: A trade size 2-1/2 in. IMC with an allowable 40% fill of 2.054 sq. in. should
be selected.
If more than 2 conductors are used in a tube of EMT conduit, the total interior area
that can be filled is no more than ______ percent.
*(Pg. 70-680) - Answer--40%
What is the maximum cross-sectional value that conduit nipples under 24 inches
long may be filled?
*(pg. 70-678) - Answer--60%
(4) Where conduit or tubing nipples having a maximum length not to exceed 600 mm
(24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples
shall be permitted to be filled to 60% of their total cross-sectional area, and
310.15(B)(3)(a) adjustment factors need not apply to this condition
True or False:
The raceway fill limitations detailed in 300.17 will apply to coaxial cables. -
Answer--False
The raceway fill requirements of chapters 3 & 9 shall not apply to coaxial cables.
A bonding jumper not smaller than ________ AWG copper or equivalent must be
connected between the radio and TV equipment grounding electrode and the power
grounding electrode system when they are separate. - Answer--6 AWG
A bonding jumper not smaller than 6 AWG copper or equivalent shall be connected
between the radio & TV equipment grounding and the power grounding electrode
system at the building or structure served where separate electrodes are used.
How far must the separation be between any light, power, or Class 1 conductors or
radio & TV conductors, and underground antenna conductors for radio & TV
receiving equipment? - Answer--12 inches
underground conductors shall be separated at least 300mm (12 in.) from conductors
of any light or power circuits or Class 1 circuits.
Unless otherwise permitted, communications cables and wires must be separated at
least 2 in. from which circuit conductors? - Answer--Power, lighting, or Class 1
Bank with 400 Practice Questions and
Correct Answers/ Journeyman Electrician
License Latest Practice Test Bank (New!)
Where K=12.9, what is the approximate voltage-drop on a circuit where an
80-ampere, 240-volt, single-phase load is supplied with size 3 AWG copper
conductors with THWN insulation, and placed 200 feet from a panelboard?
*Chapter 9 tables, table 8 conductor properties
(pg. 70-689) - Answer--7.84 volts
voltage-drop formula
VD=2KID VD=2 x 12.9 x 80amps x 200ft. =7.84
CM 52.620 CM
Given the following information, what is the maximum approximate distance a
single-phase, 240-volt, 42-ampere load can be located from a panelboard?
*copper conductors - K = 12.9
*size 8 AWG THWN/THHN conductors are used
*limit voltage drop to 3%
*Chapter 9 tables, table 8 conductor properties
(pg. 70-689) - Answer--50 feet
Distance formula
1st. find allowable VD - 240volts x 3% = 7.2volts
D=CM x VD
D=16,510 x 7.2=118,872=109.7feet
2 x K X I 2 X 12.9 X 42
What is the minimum allowable trade size intermediate metal conduit (IMC) required
to contain a total of ten (10) copper THW conductors in a 20ft run, five (5) size 1
AWG and five (5) size 3 AWG?
*(Pg. 70-684) - Answer--2-1/2 Inches
, size 1 AWG THW=.1901 sq. in. x 5=.9505 sq. in.
size 3 AWG THW=.1134 SQ. IN. x 5=.537 sq. in.
total=1.5175 sq. in.
*NOTE: A trade size 2-1/2 in. IMC with an allowable 40% fill of 2.054 sq. in. should
be selected.
If more than 2 conductors are used in a tube of EMT conduit, the total interior area
that can be filled is no more than ______ percent.
*(Pg. 70-680) - Answer--40%
What is the maximum cross-sectional value that conduit nipples under 24 inches
long may be filled?
*(pg. 70-678) - Answer--60%
(4) Where conduit or tubing nipples having a maximum length not to exceed 600 mm
(24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples
shall be permitted to be filled to 60% of their total cross-sectional area, and
310.15(B)(3)(a) adjustment factors need not apply to this condition
True or False:
The raceway fill limitations detailed in 300.17 will apply to coaxial cables. -
Answer--False
The raceway fill requirements of chapters 3 & 9 shall not apply to coaxial cables.
A bonding jumper not smaller than ________ AWG copper or equivalent must be
connected between the radio and TV equipment grounding electrode and the power
grounding electrode system when they are separate. - Answer--6 AWG
A bonding jumper not smaller than 6 AWG copper or equivalent shall be connected
between the radio & TV equipment grounding and the power grounding electrode
system at the building or structure served where separate electrodes are used.
How far must the separation be between any light, power, or Class 1 conductors or
radio & TV conductors, and underground antenna conductors for radio & TV
receiving equipment? - Answer--12 inches
underground conductors shall be separated at least 300mm (12 in.) from conductors
of any light or power circuits or Class 1 circuits.
Unless otherwise permitted, communications cables and wires must be separated at
least 2 in. from which circuit conductors? - Answer--Power, lighting, or Class 1
