Transcript Practice Code Look Up

Copyright 2008 Ted "Smitty" Smith
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Copyright 2005 Ted "Smitty" Smith
This
drill is a mixture of
calculations and code
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Copyright 2005 Ted "Smitty" Smith
1.
Equipment grounding conductors shall be
permitted to be sectioned within a listed
multiconductor cable, provided the combined
_______________ complies with 250.122.
A. Current and load
B. Voltages of all applied loads
C. Circular mill area
D. None of the above
Copyright 2008 Ted "Smitty" Smith

Circular mill area

310.13
Copyright 2005 Ted "Smitty" Smith

A conductor with insulation marked ZW
will be suitable for use in all:
Wet locations
Hospital operating rooms
House boats
None of the above
Copyright 2005 Ted "Smitty" Smith
Wet locations
 Table 310.13(A)

Copyright 2005 Ted "Smitty" Smith

Where more than one calculated or
____________ ampacity could apply for a
given circuit, the lowest value shall be
used.
Determined
Tabulated
Corrected
Derated
Copyright 2005 Ted "Smitty" Smith

Tabulated 310.15(A)(2)
Copyright 2005 Ted "Smitty" Smith

Where bare or covered conductors are
installed with insulated conductors, the
temperature rating of the bare or covered
conductor shall be _____________ for the
purpose of determining ampacity
 Equal to the lowest temperature rating of the
insulated conductors
 Equal to the highest temperature rating of the
insulated conductors
 Equal to the average temperature ratings of the
insulated conductors.
 None of the above
Copyright 2005 Ted "Smitty" Smith


Equal to the lowest temperature rating of the
insulated conductors
310.15(B)(3)
Copyright 2005 Ted "Smitty" Smith

A 2 AWG TW conductor is installed in a
location where the ambient
temperature is expected to be 108
degrees F. The temperature correction
factor for conductor ampacity in this
location is _________.
.96
.88
.82
.71
Copyright 2005 Ted "Smitty" Smith
.71
 Table 310.16 Bottom, 60c wire at 102
degrees F.
 I recommend using a straight edge
when using NEC tables. A clear plastic 6
inch ruler is best.

Copyright 2005 Ted "Smitty" Smith

If the ambient temperature is 30 degrees
C, the minimum insulation that a
conductor must have and still have the
capacity to carry current is __________
60 C
105 C
90 C
Any of these
Copyright 2008 Ted "Smitty" Smith
Any of these
 All of these conductors are rated for 30
degrees C

Copyright 2005 Ted "Smitty" Smith

Determine the minimum sized THHN
aluminum conductor that can be
installed to feed a load of 104 amperes
that is located in a freezer that has an
ambient temperature of 22 degrees
Celsius.
1 AWG
2 AWG
3 AWG
1/0 AWG
Copyright 2008 Ted "Smitty" Smith
 100 A 1/0 AWG
 110.14(c) will require you handle 104 amperes
in the 75 C column, so another two wire sizes will
be required, therefore 1/0.
Copyright 2005 Ted "Smitty" Smith

The ampacity of six-current carrying 10
AWG RHW aluminum conductors in a
raceway in an ambient temperature of
75 degrees F is ___________
›
›
›
›
30A
22A
16A
12A
Copyright 2005 Ted "Smitty" Smith
15.75A
 Table 310.16 and 310.15(B)(2)(a)

Copyright 2005 Ted "Smitty" Smith

The ampacity of nine current carrying 10 AWG THW
conductors installed in a 20 inch long raceway is
_________.
› 25A
› 30A
› 35A
› None of these
Copyright 2005 Ted "Smitty" Smith
35A
 Bundle factors do not apply to raceways
that are 24 inches in length or less.

Copyright 2005 Ted "Smitty" Smith

Enclosures for switches or over current devices shall not be
used as junction boxes, auxiliary gutters, or raceways for
conductors feeding through or tapping off to other switches
or over current devices, unless adequate space for this
purpose is provided. The conductors shall not fill the wiring
space at any cross section to more than _______ percent of
the cross-sectional area of the space.
› 20
› 25
› 35
› 40
Copyright 2005 Ted "Smitty" Smith
40
 312.8

Copyright 2005 Ted "Smitty" Smith

What is the area in square inches for a 14
AWG RHW without outer covering
conductor?
› 0.0209
› 0.0172
› 0.0252
› 0.0278
Copyright 2005 Ted "Smitty" Smith
0.0209
 Table 5, Chapter 9

Copyright 2005 Ted "Smitty" Smith

What is the cross sectional area in square inches for
12 AWG RHH with outer covering conductors?
› 0.0117
› 0.0353
› 0.0252
› 0.0327
Copyright 2005 Ted "Smitty" Smith
0.0353
 Table 5, Chapter 9

Copyright 2005 Ted "Smitty" Smith

A 200A feeder installed in Schedule 80
rigid non-metallic conduit has three 3/0
AWG THHN, one 2 AWG THHN and one 6
AWG THHN conductors. What is the
minimum sized raceway required?
2 inch
2.5 inch
3 inch
3.5 inch
Copyright 2005 Ted "Smitty" Smith

2 inch
Copyright 2005 Ted "Smitty" Smith

What size rigid metal nipple is required
for three 4/0 AWG THHN, one 1/0 AWG
THHN and one 4 AWG THHN conductors?
1.5 inch
2 inch
2.5 inch
None of these
Copyright 2005 Ted "Smitty" Smith
1.5 inch
 1.239
 60% fill based on note 4 to Table 1

Copyright 2005 Ted "Smitty" Smith

What size outlet box is required for one
12/2 NM cable that terminates on a
switch, on 12/3 NM cable that terminates
on a receptacle, and the box has
manufactured internal cable clamps.
› 4 x 1 1/4 square
› 4 x 1 1/2 square
› 4 x 2 1/8 square
› None of these
Copyright 2005 Ted "Smitty" Smith

4 x 2 1/8 Square
Copyright 2005 Ted "Smitty" Smith

Machine screw type fasteners that
engage not less than two and thread
forming machine screws that engage
not less than two threads in the
enclosure may be used to mount
equipment grounding bars, buses and
lugs to enclosures.
› True
› False
Copyright 2005 Ted "Smitty" Smith
True
 250.8

Copyright 2005 Ted "Smitty" Smith

What is the net computed demand load for
the air conditioning and heat for a 40 unit
multifamily building that has an air
conditioner ( 3hp, 3.91 kW 230V) and two
baseboard heaters (3 kW) in each unit.
› 160 kW
› 240 kW
› 6 kW
› 5 kW
Copyright 2005 Ted "Smitty" Smith
240 kW
 Heat is larger load than A/C

Copyright 2005 Ted "Smitty" Smith

What is the demand load on the main
service entrance of an apartment
complex that is supplied with a 120/208V
single phase service for twelve 3.25 kW
ovens?
10 kW
18 kW
15 kW
20 kW
Copyright 2005 Ted "Smitty" Smith

18 kW
Copyright 2005 Ted "Smitty" Smith

What is the general lighting load for a
dwelling unit with 2,700 square feet of
living space not including open porches,
garages, or unused or unfinished spaces
not adaptable for future use?
›
›
›
›
8100 VA
12600 VA
2700 VA
6480 VA
Copyright 2005 Ted "Smitty" Smith

8100 VA
Copyright 2005 Ted "Smitty" Smith

What is the feeder or service demand for
two 3 kW ranges?
› 3 kW
› 4.8 kW
› 4.5 kW
› 3.9 kW
Copyright 2005 Ted "Smitty" Smith
 4.5 kW
Copyright 2005 Ted "Smitty" Smith

If the total demand is 30 kW for a
120/240V dwelling unit, what is the
minimum sized service and feeder
copper conductor size allowed?
4 AWG
3/0 AWG
2 AWG
1/0 AWG
Copyright 2005 Ted "Smitty" Smith
2 AWG
 30,000/240= 125A
 Table 310.15(B)(6) shows 2 AWG copper
for 125A services

Copyright 2005 Ted "Smitty" Smith

What is the demand on the main service
entrance of a single family dwelling of a
range with a nameplate rating of 13.9
kVA at 240 volts?
› 8000 VA
› 8800 VA
› 9600 VA
› 10000 VA
Copyright 2005 Ted "Smitty" Smith

8800 VA
Table 220.55 Note 1
Copyright 2005 Ted "Smitty" Smith

The disconnecting means for surge
protective devices shall not be
considered a disconnecting means
when determining the maximum
number of handles for the service
disconnecting means.
True
False
Copyright 2005 Ted "Smitty" Smith
True
 230.71(A)(2)

Copyright 2005 Ted "Smitty" Smith

Metal enclosures and raceways for service
conductors and equipment shall be
connected to the _______________ system
conductor if the electrical system is
grounded or to the ________________
conductor for electrical systems that are
not grounded.
 Grounded/ ungrounded
 Grounded/ grounding electrode
 Grounding/ grounded
 None of the above
Copyright 2005 Ted "Smitty" Smith
Grounded/ Grounding electrode
 250.80

Copyright 2005 Ted "Smitty" Smith
Each of the
slides will now
be repeated.
They are not
timed in this
segment. To
change a slide,
click on the side
with your left
mouse button.
Be sure to
physically look
up the answers
in your code
book to improve
your look up
speed and skill.
Copyright 2005 Ted "Smitty" Smith
1.
Equipment grounding conductors shall be
permitted to be sectioned within a listed
multiconductor cable, provided the combined
_______________ complies with 250.122.
A. Current and load
B. Voltages of all applied loads
C. Circular mill area
D. None of the above
Copyright 2008 Ted "Smitty" Smith

Circular mill area

310.13
Copyright 2005 Ted "Smitty" Smith

A conductor with insulation marked ZW
will be suitable for use in all:
Wet locations
Hospital operating rooms
House boats
None of the above
Copyright 2005 Ted "Smitty" Smith
Wet locations
 Table 310.13(A)

Copyright 2005 Ted "Smitty" Smith

Where more than one calculated or
____________ ampacity could apply for a
given circuit, the lowest value shall be
used.
Determined
Tabulated
Corrected
Derated
Copyright 2005 Ted "Smitty" Smith

Tabulated 310.15(A)(2)
Copyright 2005 Ted "Smitty" Smith

Where bare or covered conductors are
installed with insulated conductors, the
temperature rating of the bare or covered
conductor shall be _____________ for the
purpose of determining ampacity
 Equal to the lowest temperature rating of the
insulated conductors
 Equal to the highest temperature rating of the
insulated conductors
 Equal to the average temperature ratings of the
insulated conductors.
 None of the above
Copyright 2005 Ted "Smitty" Smith


Equal to the lowest temperature rating of the
insulated conductors
310.15(B)(3)
Copyright 2005 Ted "Smitty" Smith

A 2 AWG TW conductor is installed in a
location where the ambient
temperature is expected to be 108
degrees F. The temperature correction
factor for conductor ampacity in this
location is _________.
.96
.88
.82
.71
Copyright 2005 Ted "Smitty" Smith
.71
 Table 310.16 Bottom, 60c wire at 102
degrees F.
 I recommend using a straight edge
when using NEC tables. A clear plastic 6
inch ruler is best.

Copyright 2005 Ted "Smitty" Smith

If the ambient temperature is 30 degrees
C, the minimum insulation that a
conductor must have and still have the
capacity to carry current is __________
60 C
105 C
90 C
Any of these
Copyright 2008 Ted "Smitty" Smith
Any of these
 All of these conductors are rated for 30
degrees C

Copyright 2005 Ted "Smitty" Smith

Determine the minimum sized THHN
aluminum conductor that can be
installed to feed a load of 104 amperes
that is located in a freezer that has an
ambient temperature of 22 degrees
Celsius.
1 AWG
2 AWG
3 AWG
1/0 AWG
Copyright 2008 Ted "Smitty" Smith
 100 A 1/0 AWG
 110.14(c) will require you handle 104 amperes
in the 75 C column, so another two wire sizes will
be required, therefore 1/0.
Copyright 2005 Ted "Smitty" Smith

The ampacity of six-current carrying 10
AWG RHW aluminum conductors in a
raceway in an ambient temperature of
75 degrees F is ___________
›
›
›
›
30A
22A
16A
12A
Copyright 2005 Ted "Smitty" Smith
15.75A
 Table 310.16 and 310.15(B)(2)(a)

Copyright 2005 Ted "Smitty" Smith

The ampacity of nine current carrying 10 AWG THW
conductors installed in a 20 inch long raceway is
_________.
› 25A
› 30A
› 35A
› None of these
Copyright 2005 Ted "Smitty" Smith
35A
 Bundle factors do not apply to raceways
that are 24 inches in length or less.

Copyright 2005 Ted "Smitty" Smith

Enclosures for switches or over current devices shall not be
used as junction boxes, auxiliary gutters, or raceways for
conductors feeding through or tapping off to other switches
or over current devices, unless adequate space for this
purpose is provided. The conductors shall not fill the wiring
space at any cross section to more than _______ percent of
the cross-sectional area of the space.
› 20
› 25
› 35
› 40
Copyright 2005 Ted "Smitty" Smith
40
 312.8

Copyright 2005 Ted "Smitty" Smith

What is the area in square inches for a 14
AWG RHW without outer covering
conductor?
› 0.0209
› 0.0172
› 0.0252
› 0.0278
Copyright 2005 Ted "Smitty" Smith
0.0209
 Table 5, Chapter 9

Copyright 2005 Ted "Smitty" Smith

What is the cross sectional area in square inches for
12 AWG RHH with outer covering conductors?
› 0.0117
› 0.0353
› 0.0252
› 0.0327
Copyright 2005 Ted "Smitty" Smith
0.0353
 Table 5, Chapter 9

Copyright 2005 Ted "Smitty" Smith

A 200A feeder installed in Schedule 80
rigid non-metallic conduit has three 3/0
AWG THHN, one 2 AWG THHN and one 6
AWG THHN conductors. What is the
minimum sized raceway required?
2 inch
2.5 inch
3 inch
3.5 inch
Copyright 2005 Ted "Smitty" Smith

2 inch
Copyright 2005 Ted "Smitty" Smith

What size rigid metal nipple is required
for three 4/0 AWG THHN, one 1/0 AWG
THHN and one 4 AWG THHN conductors?
1.5 inch
2 inch
2.5 inch
None of these
Copyright 2005 Ted "Smitty" Smith
1.5 inch
 1.239
 60% fill based on note 4 to Table 1

Copyright 2005 Ted "Smitty" Smith

What size outlet box is required for one
12/2 NM cable that terminates on a
switch, on 12/3 NM cable that terminates
on a receptacle, and the box has
manufactured internal cable clamps.
› 4 x 1 1/4 square
› 4 x 1 1/2 square
› 4 x 2 1/8 square
› None of these
Copyright 2005 Ted "Smitty" Smith

4 x 2 1/8 Square
Copyright 2005 Ted "Smitty" Smith

Machine screw type fasteners that
engage not less than two and thread
forming machine screws that engage
not less than two threads in the
enclosure may be used to mount
equipment grounding bars, buses and
lugs to enclosures.
› True
› False
Copyright 2005 Ted "Smitty" Smith
True
 250.8

Copyright 2005 Ted "Smitty" Smith

What is the net computed demand load for
the air conditioning and heat for a 40 unit
multifamily building that has an air
conditioner ( 3hp, 3.91 kW 230V) and two
baseboard heaters (3 kW) in each unit.
› 160 kW
› 240 kW
› 6 kW
› 5 kW
Copyright 2005 Ted "Smitty" Smith
240 kW
 Heat is larger load than A/C

Copyright 2005 Ted "Smitty" Smith

What is the demand load on the main
service entrance of an apartment
complex that is supplied with a 120/208V
single phase service for twelve 3.25 kW
ovens?
10 kW
18 kW
15 kW
20 kW
Copyright 2005 Ted "Smitty" Smith

18 kW
Copyright 2005 Ted "Smitty" Smith

What is the general lighting load for a
dwelling unit with 2,700 square feet of
living space not including open porches,
garages, or unused or unfinished spaces
not adaptable for future use?
›
›
›
›
8100 VA
12600 VA
2700 VA
6480 VA
Copyright 2005 Ted "Smitty" Smith

8100 VA
Copyright 2005 Ted "Smitty" Smith

What is the feeder or service demand for
two 3 kW ranges?
› 3 kW
› 4.8 kW
› 4.5 kW
› 3.9 kW
Copyright 2005 Ted "Smitty" Smith
 4.5 kW
Copyright 2005 Ted "Smitty" Smith

If the total demand is 30 kW for a
120/240V dwelling unit, what is the
minimum sized service and feeder
copper conductor size allowed?
4 AWG
3/0 AWG
2 AWG
1/0 AWG
Copyright 2005 Ted "Smitty" Smith
2 AWG
 30,000/240= 125A
 Table 310.15(B)(6) shows 2 AWG copper
for 125A services

Copyright 2005 Ted "Smitty" Smith

What is the demand on the main service
entrance of a single family dwelling of a
range with a nameplate rating of 13.9
kVA at 240 volts?
› 8000 VA
› 8800 VA
› 9600 VA
› 10000 VA
Copyright 2005 Ted "Smitty" Smith

8800 VA
Table 220.55 Note 1
Copyright 2005 Ted "Smitty" Smith

The disconnecting means for surge
protective devices shall not be
considered a disconnecting means
when determining the maximum
number of handles for the service
disconnecting means.
True
False
Copyright 2005 Ted "Smitty" Smith
True
 230.71(A)(2)

Copyright 2005 Ted "Smitty" Smith

Metal enclosures and raceways for service
conductors and equipment shall be
connected to the _______________ system
conductor if the electrical system is
grounded or to the ________________
conductor for electrical systems that are
not grounded.
 Grounded/ ungrounded
 Grounded/ grounding electrode
 Grounding/ grounded
 None of the above
Copyright 2005 Ted "Smitty" Smith
Grounded/ Grounding electrode
 250.80

Copyright 2005 Ted "Smitty" Smith