Solution and Answer Guide Electrical Wiring
Commercial 18th Edition
Many electricians wire the lights and receptacles in a room on different circuits because
this - answers offers the advantage that all power in a room will not go out if the
overcurrent protective device trips
Ceiling fan speed can be controlled by - answers pull chain on the fan; speed control
mounted in a wall box; remote control similar to TV/VCR type
The NEC allows what maximum number of receptacle outlets to be connected on a 120-
volt residential lighting or small-appliance branch circuit? - answers unlimited
The maximum volt-ampere loading permitted on a 20-ampere branch circuit with a
continuous load is - answers 1920 VA
Which of the following switch types is rarely used in residential wiring? - answers
double-pole
When someone decides to use a bedroom as a home office instead, - answers a lot of
electronic equipment will have to be plugged in
When installing a ceiling paddle fan, the outlet box must be - answers listed and marked
as acceptable for fan support
Receptacles installed on 15- and 20-ampere branch circuits must be of the ______
type. - answers grounding
The selection of outlet boxes and switch boxes is made by the electrician. These
decisions are based on Code requirements, space allowances, good wiring practices,
and - answers common sense
Ceiling fan boxes designed to support more than _____ pounds must have the
maximum weight they are designed to support included in the marking. - answers 35
In a home office, the current draw is - answers low
A raised plaster cover (often called a plaster ring or mud ring) is permitted to increase
the maximum number of conductors permitted in an outlet box when it is - answers
marked with its cubic-inch volume
A light above a workbench is an example of - answers task lighting
A light dimmer ______ be used as a speed control for a ceiling fan or other motor. -
answers should not
,Receptacle outlets must be installed in any wall space ______ or more in width. -
answers 24in (600mm)
In a room that may be used as a home office, you could consider - answers using 12
AWG for the home run or even the entire branch circuit(s); wiring in quadplex
receptacles instead of duplex receptacles; using only plug-in strips that are UL listed
During the winter, it is suggested that a paddle fan should - answers draw up air
Sliding glass panels ______ considered to be wall space, the same as any other interior
or exterior door. - answers are not
Which of the following is required in order to dim fluorescent fixtures? - answers
fluorescent dimmer; dimming ballasts
Ceiling fans must be specially supported for all of the following reasons, except for -
answers safe grounding
Residential wiring plans generally show lighting and receptacles outlet locations but not
circuits. The electrician should design the installation with which of the following in
mind? - answers economy-minimizing the number and length of circuits; convenience
for the homeowner or other user; NEC requirements
When designing a home office, you could consider roughing in more wall receptacles
than the NEC - answers minimum
Install luminaires listed for _____ locations if they will be subject to shower spray. -
answers wet
As defined in Article 100, a bathroom is required to have a - answers basin
GFCI-protected receptacles _____ permitted to be installed within a tub or shower
space. - answers are not
Recessed or surfaced-mounted luminaires and recessed exhaust fans may be located
within the restricted zone near the bathtub - answers may
Ceiling-suspended paddle fans must not be located within a zone measured _____
horizontally and ____ vertically from the top of the bathtub rim or top of a shower stall
threshold. - answers 3ft (900mm); 8ft (2.5m)
Lighting fixtures intended for installation in wet locations must be - answers marked
"suitable for wet locations"
A location exposed to the weather is a _____ location - answers wet
, The Code permits all bathroom receptacles to be on a single _____ branch circuit so
long as it doesn't supply other loads - answers 20-ampere
In addition to being fastened to the outlet box, the track for track lighting is generally
fastened to the ceiling with _____. - answers toggle bolts and screws
Lighting track in residential installations shall not be cut to length in the field unless
permitted by the ______ - answers manufacturer
When using nonmetallic boxes, the volume allowance is based on ______ - answers
wiring devices; cable clamps; equipment grounding conductors
Lighting track is not permitted to be installed less than _____ above a finished floor
unless it is protected against physical damage, or if the track is of the low-voltage type
operating at less than 30 volts rms open-circuit voltage. - answers 5 ft
A doorjamb switch is usually mounted about _____ feet above the floor, on the inside of
the 2x4 framing on the hinge side of the closet door. - answers 6
A receptacle below a 4-way switch in the corner of a living room is required because the
Code requires that a receptacle be installed in any wall space _____in. or more in width.
- answers 24
Lighting track ______ permitted to be installed within a zone extending 3ft horizontally
and 8ft vertically from the top of a bathtub rim. - answers is not
Lighting track in residential installations must not be installed - answers in damp or wet
locations; concealed; through walls or partitions
Electronic dimmers use triacs to chop the ac sine wave, so some incandescent lamps
might ______ because the lamp filament vibrates. - answers hum
Antennas and lead-in conductors may be attached to an electric service mast if they are
kept a minimum of 36 in. (900mm) below the power conductors. - answers False
On the outside of a building, position and fasten lead-in conductors so they cannot
swing closer than 24 in. (600mm) to light and power conductors having not over 250
volts between conductors; 8ft (3 m) if over 250 volts between conductors. - answers
False
According to NFPA 72, fire warning equipment has two primary purposes: to provide
protection to property, and to provide a reliable means to notify the occupants of the
presence of a threatening fire and the need to escape to a place of safety. - answers
False
Commercial 18th Edition
Many electricians wire the lights and receptacles in a room on different circuits because
this - answers offers the advantage that all power in a room will not go out if the
overcurrent protective device trips
Ceiling fan speed can be controlled by - answers pull chain on the fan; speed control
mounted in a wall box; remote control similar to TV/VCR type
The NEC allows what maximum number of receptacle outlets to be connected on a 120-
volt residential lighting or small-appliance branch circuit? - answers unlimited
The maximum volt-ampere loading permitted on a 20-ampere branch circuit with a
continuous load is - answers 1920 VA
Which of the following switch types is rarely used in residential wiring? - answers
double-pole
When someone decides to use a bedroom as a home office instead, - answers a lot of
electronic equipment will have to be plugged in
When installing a ceiling paddle fan, the outlet box must be - answers listed and marked
as acceptable for fan support
Receptacles installed on 15- and 20-ampere branch circuits must be of the ______
type. - answers grounding
The selection of outlet boxes and switch boxes is made by the electrician. These
decisions are based on Code requirements, space allowances, good wiring practices,
and - answers common sense
Ceiling fan boxes designed to support more than _____ pounds must have the
maximum weight they are designed to support included in the marking. - answers 35
In a home office, the current draw is - answers low
A raised plaster cover (often called a plaster ring or mud ring) is permitted to increase
the maximum number of conductors permitted in an outlet box when it is - answers
marked with its cubic-inch volume
A light above a workbench is an example of - answers task lighting
A light dimmer ______ be used as a speed control for a ceiling fan or other motor. -
answers should not
,Receptacle outlets must be installed in any wall space ______ or more in width. -
answers 24in (600mm)
In a room that may be used as a home office, you could consider - answers using 12
AWG for the home run or even the entire branch circuit(s); wiring in quadplex
receptacles instead of duplex receptacles; using only plug-in strips that are UL listed
During the winter, it is suggested that a paddle fan should - answers draw up air
Sliding glass panels ______ considered to be wall space, the same as any other interior
or exterior door. - answers are not
Which of the following is required in order to dim fluorescent fixtures? - answers
fluorescent dimmer; dimming ballasts
Ceiling fans must be specially supported for all of the following reasons, except for -
answers safe grounding
Residential wiring plans generally show lighting and receptacles outlet locations but not
circuits. The electrician should design the installation with which of the following in
mind? - answers economy-minimizing the number and length of circuits; convenience
for the homeowner or other user; NEC requirements
When designing a home office, you could consider roughing in more wall receptacles
than the NEC - answers minimum
Install luminaires listed for _____ locations if they will be subject to shower spray. -
answers wet
As defined in Article 100, a bathroom is required to have a - answers basin
GFCI-protected receptacles _____ permitted to be installed within a tub or shower
space. - answers are not
Recessed or surfaced-mounted luminaires and recessed exhaust fans may be located
within the restricted zone near the bathtub - answers may
Ceiling-suspended paddle fans must not be located within a zone measured _____
horizontally and ____ vertically from the top of the bathtub rim or top of a shower stall
threshold. - answers 3ft (900mm); 8ft (2.5m)
Lighting fixtures intended for installation in wet locations must be - answers marked
"suitable for wet locations"
A location exposed to the weather is a _____ location - answers wet
, The Code permits all bathroom receptacles to be on a single _____ branch circuit so
long as it doesn't supply other loads - answers 20-ampere
In addition to being fastened to the outlet box, the track for track lighting is generally
fastened to the ceiling with _____. - answers toggle bolts and screws
Lighting track in residential installations shall not be cut to length in the field unless
permitted by the ______ - answers manufacturer
When using nonmetallic boxes, the volume allowance is based on ______ - answers
wiring devices; cable clamps; equipment grounding conductors
Lighting track is not permitted to be installed less than _____ above a finished floor
unless it is protected against physical damage, or if the track is of the low-voltage type
operating at less than 30 volts rms open-circuit voltage. - answers 5 ft
A doorjamb switch is usually mounted about _____ feet above the floor, on the inside of
the 2x4 framing on the hinge side of the closet door. - answers 6
A receptacle below a 4-way switch in the corner of a living room is required because the
Code requires that a receptacle be installed in any wall space _____in. or more in width.
- answers 24
Lighting track ______ permitted to be installed within a zone extending 3ft horizontally
and 8ft vertically from the top of a bathtub rim. - answers is not
Lighting track in residential installations must not be installed - answers in damp or wet
locations; concealed; through walls or partitions
Electronic dimmers use triacs to chop the ac sine wave, so some incandescent lamps
might ______ because the lamp filament vibrates. - answers hum
Antennas and lead-in conductors may be attached to an electric service mast if they are
kept a minimum of 36 in. (900mm) below the power conductors. - answers False
On the outside of a building, position and fasten lead-in conductors so they cannot
swing closer than 24 in. (600mm) to light and power conductors having not over 250
volts between conductors; 8ft (3 m) if over 250 volts between conductors. - answers
False
According to NFPA 72, fire warning equipment has two primary purposes: to provide
protection to property, and to provide a reliable means to notify the occupants of the
presence of a threatening fire and the need to escape to a place of safety. - answers
False
