JOURNEYMAN PRACTICE EXAM #2
BOOK EXAM 100% SOLVED
,For one-family dwellings and each unit of a two-family dwelling, at least one 125-volt,
single phase, 15- or 20-ampere receptacle outlet readily accessible from grade and
NOT more than _____ above grade level shall be installed at the front and back of the
dwelling.
A. 5½ feet
B. 8 feet
C. 6 feet
D. 6½ feet - ANSWERSD - The objective of Section 210.52(E)(1) is to provide readily
accessible receptacles at the front and back of dwellings at a height of not more than
6½ feet above grade level so that the receptacles are capable of being reached by the
average person without the use of ladders.
Where voltage drop and ambient temperature are not a consideration, the conductors
used to supply a continuous-duty, 3-phase, 208-volt, Design C, induction type motor are
to have an allowable ampacity of at LEAST _____.
A. 30.8 amperes
B. 38.5 amperes
C. 67.8 amperes
D. 46.2 amperes - ANSWERSB - First, find the full-load running current of the motor in
Table 430.250. [30.8 amperes] Next, note that Section 430.22 requires conductors that
supply a single motor used in a continuous duty application shall have an ampacity of
not less than 125% of the motor full-load current rating. Therefore, 30.8 amperes x
125% = 38.5 amperes
When conductors having a voltage of not more than 1000 volts pass above a public
driveway, they shall have a MINIMUM clearance of NOT less than _____ above finished
grade.
A. 10 feet
B. 15 feet
C. 18 feet
D. 20 feet - ANSWERSC - The purpose of this rule, Section 225.18(4), is to maintain a
safe clearance distance from ground to the overhead conductors to allow the passage
of vehicle traffic in public areas. This rule helps to protect the conductors from physical
damage and to protect persons and vehicles from accidental contact with the
conductors.
Shore power for boats shall be provided by single "twist-lock' receptacles rated NOT
less than ______.
, A. 20 amperes
B. 30 amperes
C. 50 amperes
D. 60 amperes - ANSWERSB - Single locking (twist lock) and grounding receptacles,
rated not less than 30- amperes, are required for providing shore power to boats. The
intent of Section 555.19(A)(4) is to ensure proper connections and prevent unintentional
disconnection of on-board equipment such as refrigerators and bilge pumps.
Where a mobile home has the main service disconnecting means installed outdoors, the
disconnecting means shall be installed so the bottom of the enclosure is NOT less than
_____ above finished grade.
A. two feet
B. three feet
C. four feet
D. six feet - ANSWERSA - As per Section 550.32(F), an outdoor mobile home
disconnecting means shall be installed so the bottom of the disconnecting means
enclosure is not less than 2 ft. above finished grade or working platform. The 2-ft.
clearance required above finished grade should help to prevent water from entering the
enclosure.
Determine the MAXIMUM allowable ampacity of a 3-conductor size 6 AWG XHHW
aluminum SER cable installed in the attic of a one-family dwelling where the ambient
temperature is 44 degrees C.
A. 41.2 amperes
B. 52.2 amperes
C. 47.9 amperes
D. 56.2 amperes - ANSWERSC - To determine the allowable ampacity of the 3-
conductor size 6 AWG XHHW aluminum SER cable, refer to Table 310.104(A) and note
the cable is rated for 90ºC when used in a dry location. Next, find TOP Digitally
Monitored for Compliance with License Terms © 2017 Ray Holder 156 the ampacity of
the conductors before derating, which is 55 amperes, from Table 310.15(B)(16). Finally,
due to the elevated temperature, apply the temperature correction factor found on Table
310.15(B)(2)(a). Do the math as shown: Size 6 AWG AL XHHW ampacity before
derating = 55 amperes 55 amperes x .87 (temperature correction) = 47.85 amperes
Unless specifically identified for a higher percentage of fill, the cross-sectional area of
the conductors in a conduit seal, in Class I, Divisions 1 and 2 locations, shall NOT
exceed _____ of the cross-sectional area of a rigid metal conduit (RMC) of the same
trade size.
A. 25 percent
B. 40 percent
C. 50 percent
BOOK EXAM 100% SOLVED
,For one-family dwellings and each unit of a two-family dwelling, at least one 125-volt,
single phase, 15- or 20-ampere receptacle outlet readily accessible from grade and
NOT more than _____ above grade level shall be installed at the front and back of the
dwelling.
A. 5½ feet
B. 8 feet
C. 6 feet
D. 6½ feet - ANSWERSD - The objective of Section 210.52(E)(1) is to provide readily
accessible receptacles at the front and back of dwellings at a height of not more than
6½ feet above grade level so that the receptacles are capable of being reached by the
average person without the use of ladders.
Where voltage drop and ambient temperature are not a consideration, the conductors
used to supply a continuous-duty, 3-phase, 208-volt, Design C, induction type motor are
to have an allowable ampacity of at LEAST _____.
A. 30.8 amperes
B. 38.5 amperes
C. 67.8 amperes
D. 46.2 amperes - ANSWERSB - First, find the full-load running current of the motor in
Table 430.250. [30.8 amperes] Next, note that Section 430.22 requires conductors that
supply a single motor used in a continuous duty application shall have an ampacity of
not less than 125% of the motor full-load current rating. Therefore, 30.8 amperes x
125% = 38.5 amperes
When conductors having a voltage of not more than 1000 volts pass above a public
driveway, they shall have a MINIMUM clearance of NOT less than _____ above finished
grade.
A. 10 feet
B. 15 feet
C. 18 feet
D. 20 feet - ANSWERSC - The purpose of this rule, Section 225.18(4), is to maintain a
safe clearance distance from ground to the overhead conductors to allow the passage
of vehicle traffic in public areas. This rule helps to protect the conductors from physical
damage and to protect persons and vehicles from accidental contact with the
conductors.
Shore power for boats shall be provided by single "twist-lock' receptacles rated NOT
less than ______.
, A. 20 amperes
B. 30 amperes
C. 50 amperes
D. 60 amperes - ANSWERSB - Single locking (twist lock) and grounding receptacles,
rated not less than 30- amperes, are required for providing shore power to boats. The
intent of Section 555.19(A)(4) is to ensure proper connections and prevent unintentional
disconnection of on-board equipment such as refrigerators and bilge pumps.
Where a mobile home has the main service disconnecting means installed outdoors, the
disconnecting means shall be installed so the bottom of the enclosure is NOT less than
_____ above finished grade.
A. two feet
B. three feet
C. four feet
D. six feet - ANSWERSA - As per Section 550.32(F), an outdoor mobile home
disconnecting means shall be installed so the bottom of the disconnecting means
enclosure is not less than 2 ft. above finished grade or working platform. The 2-ft.
clearance required above finished grade should help to prevent water from entering the
enclosure.
Determine the MAXIMUM allowable ampacity of a 3-conductor size 6 AWG XHHW
aluminum SER cable installed in the attic of a one-family dwelling where the ambient
temperature is 44 degrees C.
A. 41.2 amperes
B. 52.2 amperes
C. 47.9 amperes
D. 56.2 amperes - ANSWERSC - To determine the allowable ampacity of the 3-
conductor size 6 AWG XHHW aluminum SER cable, refer to Table 310.104(A) and note
the cable is rated for 90ºC when used in a dry location. Next, find TOP Digitally
Monitored for Compliance with License Terms © 2017 Ray Holder 156 the ampacity of
the conductors before derating, which is 55 amperes, from Table 310.15(B)(16). Finally,
due to the elevated temperature, apply the temperature correction factor found on Table
310.15(B)(2)(a). Do the math as shown: Size 6 AWG AL XHHW ampacity before
derating = 55 amperes 55 amperes x .87 (temperature correction) = 47.85 amperes
Unless specifically identified for a higher percentage of fill, the cross-sectional area of
the conductors in a conduit seal, in Class I, Divisions 1 and 2 locations, shall NOT
exceed _____ of the cross-sectional area of a rigid metal conduit (RMC) of the same
trade size.
A. 25 percent
B. 40 percent
C. 50 percent
