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EET1051 H-7 Protections, Panelboards (12 h)

Text Book: Article 408
House Wiring: Chapters 2, 19, pages 40-51, 525-526
True/False

Indicate whether the statement is true or false.
 

 1. 

The NEC permits overcurrent protection devices to be located in bathrooms.
 

 2. 

In residential wiring, all 120 volt lighting outlets in bedrooms must be protected by an AFCI.
 

 3. 

A 12 AWG conductor can be protected by a 15-ampere fuse or circuit breaker.
 

 4. 

A single-pole circuit breaker has one stab contact and a two-pole circuit breaker has two stab contacts.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 5. 

A fuse type that uses the same standard screw base as an ordinary light bulb and where the different fuse sizes are interchangeable with each other is called a(n) __________ fuse.
a.
cartridge
b.
Edison base
c.
Type S
d.
stab
 

 6. 

A(n) __________ fuse uses different fuse bases for each size fuse and an adapter that matches each fuse size is required.
a.
cartridge
b.
Edison base
c.
Type S
d.
stab
 

 7. 

A(n) __________ fuse is enclosed in an insulating tube that confines the arc when the fuse blows and is available in either a ferrule or blade style.
a.
cartridge
b.
Edison base
c.
type S
d.
stab
 

 8. 

NEC Article __________ provides many installation requirements for overcurrent protection devices.
a.
210
b.
230
c.
250
d.
None of the above
 

 9. 

NEC Table __________ lists the ampacity of conductors used in residential wiring.
a.
240.6
b.
220.12
c.
250.66
d.
310.16
 

 10. 

In residential wiring, a 12 AWG copper conductor is protected by a __________-ampere or lower OCPD.
a.
15
b.
20
c.
25
d.
30
 

 11. 

Which of the following will not cause an overcurrent condition?
a.
Open circuit
b.
Ground fault
c.
Overload
d.
Short circuit
 

 12. 

The interrupting rating of fuses can be as high as __________ amperes.
a.
5,000
b.
10,000
c.
20,000
d.
300,000
 

 13. 

All plug fuses are limited to circuits where the voltage between conductors does not exceed __________ volts. (General Rule)
a.
240
b.
125
c.
277
d.
208
 

 14. 

Type S fuses are classified at __________ amperes.
a.
0 to 15
b.
16 to 20
c.
21 to 30
d.
All of the above
 

 15. 

A GFCI circuit breaker should be tested at least once a ___________.
a.
day
b.
week
c.
month
d.
year
 

 16. 

On a 240-volt residential branch circuit with 10 AWG conductors, a maximum of a __________-ampere overcurrent protection device must be used.
a.
20
b.
25
c.
30
d.
Any of the above
 

 17. 

When installing an ungrounded conductor in a circuit breaker, approximately __________ of insulation is stripped from the end of the conductor.
a.
1/8"
b.
1/4"
c.
1/2"
d.
3/4"
 

 18. 

A device intended to provide protection from the effects of arc faults is called a(n) __________ circuit breaker.
a.
ground fault circuit interrupter
b.
arc fault circuit interrupter
c.
special protection
d.
fuse
 

 19. 

A 240 volt electric water heater branch circuit will require a __________ circuit breaker.
a.
single-pole
b.
double-pole
c.
HACR
d.
three-pole
 

 20. 

A 120 volt branch circuit supplying a dishwasher will require a __________ circuit breaker.
a.
single-pole
b.
double-pole
c.
HACR
d.
three-pole
 

 21. 

Overcurrent protection devices must be readily accessible.
a.
True
b.
False
 

 22. 

The color coding for a 30 amp Type S plug fuse is __________.
a.
blue
b.
orange
c.
green
d.
any of the above
 

 23. 

The color coding for a 15 amp Type S plug fuse adapter is __________.
a.
blue
b.
orange
c.
green
d.
any of the above
 

 24. 

Cartridge fuses are available in both a __________ type and a __________ type.
a.
long; short
b.
round; oblong
c.
ferrule; blade
d.
open; closed
 

 25. 

Circuit breakers are always interchangeable with different manufacturer's panelboards.
a.
True
b.
False
 



 
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