Residential Electrician Exam #1Complete Questions With
100% Correct Answers.
Ferrous metal enclosures for grounding electrode conductors shall be _____.
a) electrically continuous
b) electrically isolated
c) not permitted
d) rigid metal conduit (RMC) only
A: electrically continuous
Ref: 250.64(E)
Unless listed for the control of other loads, general use dimmer switches shall only be used to control
_____.
a) switched receptacles for cord-connected incandescent luminaires
b) permanently installed incandescent luminaires
c) ceiling fans with luminaires
d) holiday decorative lighting
B: permanently installed incandescent luminaires
Ref: 404.14(E)
All 125-volt, single-phase, 15- and 20-ampere receptacles installed in residential garages shall be _____.
I) protected by a listed arc-fault interrupter
II) provided with ground-fault circuit-interrupter protection
a) I only
b) II only
c) both I and II
d) neither I nor II
B: II only
Ref: 210.8(A)(2); 210.12(B)
The MAXIMUM allowable ampacity of size 18 AWG fixture wire is _____ amperes.
a) 12
b) 10
c) 8
d) 6
D: 6
Ref: Tbl. 402.5
A receptacle outlet installed for a gas or electric clothes dryer in the laundry room of a dwelling unit
must be installed within at LEAST _____ feet of the intended location of the dryer.
a) 6
b) 4
c) 10
d) 3
, A: 6
Ref: 210.50(C)
Which of the following listed conductors are required to have overcurrent protection on a residential
electric service?
a) grounding conductors
b) bonding conductors
c) identified conductors
d) ungrounded conductors
D: ungrounded conductors
Ref: 290.9
Given: a 40-gallon electric water heater has a nameplate rating of 4,500 watts at 240 volts. What is the
MAXIMUM standard size circuit breaker the NEC permits to protect the water heater?
a) 20 amperes
b) 25 amperes
c) 30 amperes
d) 45 amperes
C: 30 amperes
Ref: 422.11(E)(3); 240.6(A); Current Formula
Sol:
I = P/E
I = 4500 va / 240 volts
I = 18.75 amps x 150 percent
I = 28.1 amperes
If a cable or raceway enters an enclosure such as a meter base, above uninsulated live parts in a wet
location, the fittings used to connect the enclosure must be _____ for wet locations.
a) identified
b) marked
c) suitable
d) listed
D: listed
Ref: 312.2(A)
In general, the power supply cord to a mobile home shall have a MAXIMUM rating of _____.
a) 50 amperes
b) 60 amperes
c) 100 amperes
d) 125 amperes
A: 50 amperes
Ref: 550.10(A)
100% Correct Answers.
Ferrous metal enclosures for grounding electrode conductors shall be _____.
a) electrically continuous
b) electrically isolated
c) not permitted
d) rigid metal conduit (RMC) only
A: electrically continuous
Ref: 250.64(E)
Unless listed for the control of other loads, general use dimmer switches shall only be used to control
_____.
a) switched receptacles for cord-connected incandescent luminaires
b) permanently installed incandescent luminaires
c) ceiling fans with luminaires
d) holiday decorative lighting
B: permanently installed incandescent luminaires
Ref: 404.14(E)
All 125-volt, single-phase, 15- and 20-ampere receptacles installed in residential garages shall be _____.
I) protected by a listed arc-fault interrupter
II) provided with ground-fault circuit-interrupter protection
a) I only
b) II only
c) both I and II
d) neither I nor II
B: II only
Ref: 210.8(A)(2); 210.12(B)
The MAXIMUM allowable ampacity of size 18 AWG fixture wire is _____ amperes.
a) 12
b) 10
c) 8
d) 6
D: 6
Ref: Tbl. 402.5
A receptacle outlet installed for a gas or electric clothes dryer in the laundry room of a dwelling unit
must be installed within at LEAST _____ feet of the intended location of the dryer.
a) 6
b) 4
c) 10
d) 3
, A: 6
Ref: 210.50(C)
Which of the following listed conductors are required to have overcurrent protection on a residential
electric service?
a) grounding conductors
b) bonding conductors
c) identified conductors
d) ungrounded conductors
D: ungrounded conductors
Ref: 290.9
Given: a 40-gallon electric water heater has a nameplate rating of 4,500 watts at 240 volts. What is the
MAXIMUM standard size circuit breaker the NEC permits to protect the water heater?
a) 20 amperes
b) 25 amperes
c) 30 amperes
d) 45 amperes
C: 30 amperes
Ref: 422.11(E)(3); 240.6(A); Current Formula
Sol:
I = P/E
I = 4500 va / 240 volts
I = 18.75 amps x 150 percent
I = 28.1 amperes
If a cable or raceway enters an enclosure such as a meter base, above uninsulated live parts in a wet
location, the fittings used to connect the enclosure must be _____ for wet locations.
a) identified
b) marked
c) suitable
d) listed
D: listed
Ref: 312.2(A)
In general, the power supply cord to a mobile home shall have a MAXIMUM rating of _____.
a) 50 amperes
b) 60 amperes
c) 100 amperes
d) 125 amperes
A: 50 amperes
Ref: 550.10(A)
