Verified Questions with Correct Answers
Quiz_________________?
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 -
Answer✅
D - 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.
Quiz_________________?
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
1
,D. 46.2 amperes -
Answer✅
B - 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
Quiz_________________?
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 -
Answer✅
C - 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.
Quiz_________________?
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 -
Answer✅
2
,B - 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.
Quiz_________________?
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 -
Answer✅
A - 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.
Quiz_________________?
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 -
Answer✅
C - 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
3
, 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
Quiz_________________?
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
D. 60 percent -
Answer✅
A - The intent of Section 501.15(C)(6) is to minimize the passage of gases from one portion
of the electrical system to another and to ensure an adequate area is available for pouring
the sealing compound. As per Table 1, Chapter 9, the maximum permitted fill area for
conduit is 40%; the maximum fill area permitted for standard conduit seals is 25%. If the
conduit fill exceeds 25% of the cross-sectional area of the sealing fitting, a larger trade size
sealing fitting is required.
Quiz_________________?
All nonlocking-type, 125-volt, 15- and 20-ampere receptacles located in guest rooms of
hotels and motels shall be listed _____ receptacles.
A. tamper-proof
B. tamper-resistant
C. extra duty
D. heavy duty -
Answer✅
4
Quiz_________________?
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 -
Answer✅
D - 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.
Quiz_________________?
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
1
,D. 46.2 amperes -
Answer✅
B - 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
Quiz_________________?
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 -
Answer✅
C - 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.
Quiz_________________?
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 -
Answer✅
2
,B - 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.
Quiz_________________?
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 -
Answer✅
A - 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.
Quiz_________________?
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 -
Answer✅
C - 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
3
, 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
Quiz_________________?
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
D. 60 percent -
Answer✅
A - The intent of Section 501.15(C)(6) is to minimize the passage of gases from one portion
of the electrical system to another and to ensure an adequate area is available for pouring
the sealing compound. As per Table 1, Chapter 9, the maximum permitted fill area for
conduit is 40%; the maximum fill area permitted for standard conduit seals is 25%. If the
conduit fill exceeds 25% of the cross-sectional area of the sealing fitting, a larger trade size
sealing fitting is required.
Quiz_________________?
All nonlocking-type, 125-volt, 15- and 20-ampere receptacles located in guest rooms of
hotels and motels shall be listed _____ receptacles.
A. tamper-proof
B. tamper-resistant
C. extra duty
D. heavy duty -
Answer✅
4
