Transcript Two Minute Drill Number Three

Two Minute Drill Number 31Residential
Improving your skill in code Look Up
Increasing Speed Drill
Copyright 2008 Ted "Smitty" Smith
Directions


Left click on the presentation ICON located at the bottom
of the slide directory to the left of the this slide.
Each slide will transition to the correct answer automatically
in 2:00 minutes. The correct answer will transition in 15
seconds.

As you progress through the slide show, the time for
each question will be reduced.

This drill is primarily concerning residential installations.
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
1. For other than single-family dwellings, spas
and hot tubs are required to have a clearly
labeled emergency shutoff or control switch
provided. This switch shall be installed at a
point readily accessible to the users and not
less than _____ feet and within sight of the
spa or hot tub.
12
10
15
5
Copyright 2008 Ted "Smitty" Smith

1. d
680.41
Copyright 2008 Ted "Smitty" Smith
In a data-processing, room the
disconnecting means for the dataprocessing equipment shall be
_____.
a. Within sight of the equipment
b. Near an exit door
c. At the main disconnect
d. Within 30 feet of the equipment

2.
Copyright 2008 Ted "Smitty" Smith

2. b
645.10
Copyright 2008 Ted "Smitty" Smith
 3.
Type MI cable shall be
supported at intervals not
exceeding _____ feet.
a. 2
b. 4
c. 6
d. 10
Copyright 2008 Ted "Smitty" Smith

3. c
332.30
Copyright 2008 Ted "Smitty" Smith
 4.
Then internal depth of an outlet
box used only to splice conductors
to a luminaire shall NOT be less
than _____.
a. ½ inch
b. 15/16 inch
c. ¾ inch
d. 1 inch
Copyright 2008 Ted "Smitty" Smith

4. a
314.24(A)
Copyright 2008 Ted "Smitty" Smith
 5.
Direct-buried conductors
emerging from grades or covers up
to at LEAST _____ above finished
grade.
a. 8 feet
b. 10 feet
c. 12 feet
d. 15 feet
Copyright 2008 Ted "Smitty" Smith

5. a
300.5(D)(1)
Copyright 2008 Ted "Smitty" Smith
6. What is the MINIMUM size equipment
grounding conductor required by the
NEC® for a branch-circuit protected by a
50-ampere rated circuit breaker?
a. 12 AWG
b. 10 AWG
c. 8 AWG
d. 6 AWG

Copyright 2008 Ted "Smitty" Smith

6. b
Tbl. 250.122
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
7. Disregarding exceptions, all three-phase,
277/480 volt, wye-connected electrical
services require ground-fault protection for
each service disconnecting means when rated
at LEAST _____ or more.
400 amperes
600 amperes
1000 amperes
1500 amperes
Copyright 2008 Ted "Smitty" Smith

7. c
230.95
Copyright 2008 Ted "Smitty" Smith







a.
b.
c.
d.
8. Determine the conductor ampacity given the following related
information:
Conductors are size 500 kcmil copper
Conductor insulation is THWN
Eight current-carrying conductors are in the raceway
Ambient temperature is 125°
Conduit length is 75 feet
Installation is a wet location
178.2 amperes
199.5 amperes
294.6 amperes
380.0 amperes
Copyright 2008 Ted "Smitty" Smith
Tbl. 310.16

TBL. 310.15(B)(2)(a)

#500 KCMIL THWN copper ampacity
before de-rating = 380 amperes

380 amperes X .67(temp. corr.) X
.7(adj. factor) = 178.22 amperes

8. a
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
9. Flexible metal conduit (FMC) is permitted
for use in wet locations ____.
When the conductors in the FMC have a
temperature rating of 90°
When the conductors contained within the
FMC are approved for use in a wet location
If the length of the FMC is not more than 6
feet
Never
Copyright 2008 Ted "Smitty" Smith

9. d
348.12
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
10. Given: a trade size ½-inch rigid metal
conduit (RMC) is to be installed in a Class I
location and a trade size ½ conduit seal is
required. The MINIMUM thickness of the
sealing compound shall NOT be less than
_____.
3/8 inch
½ inch
5/8 inch
¾ inch
Copyright 2008 Ted "Smitty" Smith

10. c
501.15(C)(3)
Copyright 2008 Ted "Smitty" Smith

11. Where a water pipe passes over an
indoor motor control center, leak
protection apparatus shall have a
MINIMUM clearance of ____.
a.
6 feet to the protection apparatus
6 feet to the water pipe
6 ½ feet to the protection apparatus
6 ½ feet to
the water pipe
Copyright 2008 Ted "Smitty" Smith
b.
c.
d.

11. a
110.216(f)(1)(a)
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
12. Branch circuit grounded conductors that
are not connected to an overcurrent device
shall be permitted to be sized at LEAST _____
of the continuous and non-continuous load to
be served.
100 percent
80 percent
75 percent
125 percent
Copyright 2008 Ted "Smitty" Smith

12. a
210.19(A)(1), Ex. 2
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
13. The MAXIMUM standard rating of the
initial non-time-delay fuse for the branchcircuit, short-circuit, and ground-fault
protection of a 1 HP, three-phase, 208-volt,
squirrel-cage AC motor shall be ______.
6 amperes
10 amperes
15 amperes
20 amperes
Copyright 2008 Ted "Smitty" Smith
Tbl. 430.250

Tbl. 430.52

430.52(C)(1), Ex. 1

FLC of motor – 406 amperes X 300%
= 13.8 amperes
 *NOTE: The next standard size fuse
with a rating of 15 amperes should be
selected.

13. c
Copyright 2008 Ted "Smitty" Smith
14. For Class III equipment that is not
subject to overloading the MAXIMUM
surface temperature under operating
conditions shall NOT exceed _____.
a. 120°C
b. 165°C
c. 248°F
d. 210°C

Copyright 2008 Ted "Smitty" Smith

14. b
503.5
Copyright 2008 Ted "Smitty" Smith
15. When a metal wire-way contains
splices and taps, the conductors, splices
and taps shall not fill the wire-way to
more than _____ of its area at that
point.
a. 20 percent
b. 30 percent
c. 40 percent
d. 75 percent

Copyright 2008 Ted "Smitty" Smith

15. d
376.56(A)
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
16. In an underground installed Schedule 40
PVC conduit system that consists of 50 feet in
length between pulling points, what is the
MAXIMUM number of bends this conduit run
may have?
Four 90° bends
Six 90° bends
Four 120° bends
Two 90° bends
Copyright 2008 Ted "Smitty" Smith

16. a
352.26
Copyright 2008 Ted "Smitty" Smith
 17.
Grounding electrodes made of
pipe or conduit shall not be smaller
than _____ electrical trade size.
a. ½ inch
b. ¾ inch
c. 1 inch
d. 1 ½ inch
Copyright 2008 Ted "Smitty" Smith

17. b
250.52(A)(5)(a)
Copyright 2008 Ted "Smitty" Smith
 18.
Liquid-tight flexible metallic
conduit (LFMC) shall NOT be used
_____.
a. In lengths in excess of 6 feet
b. In concealed work
c. In hazardous locations
d. Where subject to physical damage
Copyright 2008 Ted "Smitty" Smith

18. d
350.12(1)
Copyright 2008 Ted "Smitty" Smith




a.
b.
c.
d.
19. Determine the allowable ampacity of a size 3 AWG
THHN copper conductor given the following:
Two current-carrying conductors are in the conduit.
The ambient temperature is 34°C.
The terminations are rated 60°C.
105.6 amperes
85 amperes
81.6 amperes
110 amperes
Copyright 2008 Ted "Smitty" Smith
110.14(C)

310.15(A)(2)

Tbl. 310.16
 3 AWG THHN ampacity before de-rating
= 110 amperes (90°C Col.)
 110 amperes X .96(temp. correction) =
105.6 amperes
 Size 3 AWG (60°C col.) = 85 amperes
should be selected.
Copyright 2008 Ted "Smitty" Smith

19. b

a.
b.
c.
d.
20. When an overcurrent protective device for
a surge-protective device is located at the
service location it _____.
Is not to be counted a service disconnect.
Shall be considered as a service
disconnecting means
Shall be more than 10 feet from the main
disconnecting means
Shall be prohibited
Copyright 2008 Ted "Smitty" Smith

20. a
230.71(A)
Copyright 2008 Ted "Smitty" Smith
End of Drill


Click the left mouse button to
advance back to the first
question. Each question will
now be repeated without the
timer to give you a chance to
review it and find the answer.
Clicking the left mouse
button will advance the slide
to the answer and the code
reference.
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
1. For other than single-family dwellings, spas
and hot tubs are required to have a clearly
labeled emergency shutoff or control switch
provided. This switch shall be installed at a
point readily accessible to the users and not
less than _____ feet and within sight of the
spa or hot tub.
12
10
15
5
Copyright 2008 Ted "Smitty" Smith

1. d
680.41
Copyright 2008 Ted "Smitty" Smith
In a data-processing, room the
disconnecting means for the dataprocessing equipment shall be
_____.
a. Within sight of the equipment
b. Near an exit door
c. At the main disconnect
d. Within 30 feet of the equipment

2.
Copyright 2008 Ted "Smitty" Smith

2. b
645.10
Copyright 2008 Ted "Smitty" Smith
 3.
Type MI cable shall be
supported at intervals not
exceeding _____ feet.
a. 2
b. 4
c. 6
d. 10
Copyright 2008 Ted "Smitty" Smith

3. c
332.30
Copyright 2008 Ted "Smitty" Smith
 4.
Then internal depth of an outlet
box used only to splice conductors
to a luminaire shall NOT be less
than _____.
a. ½ inch
b. 15/16 inch
c. ¾ inch
d. 1 inch
Copyright 2008 Ted "Smitty" Smith

4. a
314.24(A)
Copyright 2008 Ted "Smitty" Smith
 5.
Direct-buried conductors
emerging from grades or covers up
to at LEAST _____ above finished
grade.
a. 8 feet
b. 10 feet
c. 12 feet
d. 15 feet
Copyright 2008 Ted "Smitty" Smith

5. a
300.5(D)(1)
Copyright 2008 Ted "Smitty" Smith
6. What is the MINIMUM size equipment
grounding conductor required by the
NEC® for a branch-circuit protected by a
50-ampere rated circuit breaker?
a. 12 AWG
b. 10 AWG
c. 8 AWG
d. 6 AWG

Copyright 2008 Ted "Smitty" Smith

6. b
Tbl. 250.122
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
7. Disregarding exceptions, all three-phase,
277/480 volt, wye-connected electrical
services require ground-fault protection for
each service disconnecting means when rated
at LEAST _____ or more.
400 amperes
600 amperes
1000 amperes
1500 amperes
Copyright 2008 Ted "Smitty" Smith

7. c
230.95
Copyright 2008 Ted "Smitty" Smith







a.
b.
c.
d.
8. Determine the conductor ampacity given the following related
information:
Conductors are size 500 kcmil copper
Conductor insulation is THWN
Eight current-carrying conductors are in the raceway
Ambient temperature is 125°
Conduit length is 75 feet
Installation is a wet location
178.2 amperes
199.5 amperes
294.6 amperes
380.0 amperes
Copyright 2008 Ted "Smitty" Smith
Tbl. 310.16

TBL. 310.15(B)(2)(a)

#500 KCMIL THWN copper ampacity
before de-rating = 380 amperes

380 amperes X .67(temp. corr.) X
.7(adj. factor) = 178.22 amperes

8. a
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
9. Flexible metal conduit (FMC) is permitted
for use in wet locations ____.
When the conductors in the FMC have a
temperature rating of 90°
When the conductors contained within the
FMC are approved for use in a wet location
If the length of the FMC is not more than 6
feet
Never
Copyright 2008 Ted "Smitty" Smith

9. d
348.12
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
10. Given: a trade size ½-inch rigid metal
conduit (RMC) is to be installed in a Class I
location and a trade size ½ conduit seal is
required. The MINIMUM thickness of the
sealing compound shall NOT be less than
_____.
3/8 inch
½ inch
5/8 inch
¾ inch
Copyright 2008 Ted "Smitty" Smith

10. c
501.15(C)(3)
Copyright 2008 Ted "Smitty" Smith

11. Where a water pipe passes over an
indoor motor control center, leak
protection apparatus shall have a
MINIMUM clearance of ____.
a.
6 feet to the protection apparatus
6 feet to the water pipe
6 ½ feet to the protection apparatus
6 ½ feet to
the water pipe
Copyright 2008 Ted "Smitty" Smith
b.
c.
d.

11. a
110.216(f)(1)(a)
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
12. Branch circuit grounded conductors that
are not connected to an overcurrent device
shall be permitted to be sized at LEAST _____
of the continuous and non-continuous load to
be served.
100 percent
80 percent
75 percent
125 percent
Copyright 2008 Ted "Smitty" Smith

12. a
210.19(A)(1), Ex. 2
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
13. The MAXIMUM standard rating of the
initial non-time-delay fuse for the branchcircuit, short-circuit, and ground-fault
protection of a 1 HP, three-phase, 208-volt,
squirrel-cage AC motor shall be ______.
6 amperes
10 amperes
15 amperes
20 amperes
Copyright 2008 Ted "Smitty" Smith
Tbl. 430.250

Tbl. 430.52

430.52(C)(1), Ex. 1

FLC of motor – 406 amperes X 300%
= 13.8 amperes
 *NOTE: The next standard size fuse
with a rating of 15 amperes should be
selected.

13. c
Copyright 2008 Ted "Smitty" Smith
14. For Class III equipment that is not
subject to overloading the MAXIMUM
surface temperature under operating
conditions shall NOT exceed _____.
a. 120°C
b. 165°C
c. 248°F
d. 210°C

Copyright 2008 Ted "Smitty" Smith

14. b
503.5
Copyright 2008 Ted "Smitty" Smith
15. When a metal wire-way contains
splices and taps, the conductors, splices
and taps shall not fill the wire-way to
more than _____ of its area at that
point.
a. 20 percent
b. 30 percent
c. 40 percent
d. 75 percent

Copyright 2008 Ted "Smitty" Smith

15. d
376.56(A)
Copyright 2008 Ted "Smitty" Smith

a.
b.
c.
d.
16. In an underground installed Schedule 40
PVC conduit system that consists of 50 feet in
length between pulling points, what is the
MAXIMUM number of bends this conduit run
may have?
Four 90° bends
Six 90° bends
Four 120° bends
Two 90° bends
Copyright 2008 Ted "Smitty" Smith

16. a
352.26
Copyright 2008 Ted "Smitty" Smith
 17.
Grounding electrodes made of
pipe or conduit shall not be smaller
than _____ electrical trade size.
a. ½ inch
b. ¾ inch
c. 1 inch
d. 1 ½ inch
Copyright 2008 Ted "Smitty" Smith

17. b
250.52(A)(5)(a)
Copyright 2008 Ted "Smitty" Smith
 18.
Liquid-tight flexible metallic
conduit (LFMC) shall NOT be used
_____.
a. In lengths in excess of 6 feet
b. In concealed work
c. In hazardous locations
d. Where subject to physical damage
Copyright 2008 Ted "Smitty" Smith

18. d
350.12(1)
Copyright 2008 Ted "Smitty" Smith




a.
b.
c.
d.
19. Determine the allowable ampacity of a size 3 AWG
THHN copper conductor given the following:
Two current-carrying conductors are in the conduit.
The ambient temperature is 34°C.
The terminations are rated 60°C.
105.6 amperes
85 amperes
81.6 amperes
110 amperes
Copyright 2008 Ted "Smitty" Smith
110.14(C)

310.15(A)(2)

Tbl. 310.16
 3 AWG THHN ampacity before de-rating
= 110 amperes (90°C Col.)
 110 amperes X .96(temp. correction) =
105.6 amperes
 Size 3 AWG (60°C col.) = 85 amperes
should be selected.
Copyright 2008 Ted "Smitty" Smith

19. b

a.
b.
c.
d.
20. When an overcurrent protective device for
a surge-protective device is located at the
service location it _____.
Is not to be counted a service disconnect.
Shall be considered as a service
disconnecting means
Shall be more than 10 feet from the main
disconnecting means
Shall be prohibited
Copyright 2008 Ted "Smitty" Smith

20. a
230.71(A)
Copyright 2008 Ted "Smitty" Smith