Residential Exam – electrical systems, wiring concepts, and
comprehensive revision material
All single-phase, 15 or 20-ampere branch-circuits supplying outlets or devices installed in
residential kitchens or similar rooms, shall be protected by a listed arc-fault circuit interrupter of
the _____ type. - ANS ✔✔Combination
In dwelling units, hallways of _____ feet or more in length are required to have at least one (1),
15- or 20-ampere rated 125-volt receptacle outlet. - ANS ✔✔10
Electrical outlet boxes installed in walls and ceilings are required to be __________. - ANS
✔✔accessible
Raceways installed in solid rock shall be permitted to be buried at lesser depths than generally
required, when covered by at LEAST _____ inches of concrete, extending down to the rock. -
ANS ✔✔two
The MINIMUM number of 120-volt, 15-ampere, general lighting branch circuits required for a
dwelling that has 70 feet by 30 feet of habitable space is _____. - ANS ✔✔4
When the heating, air-conditioning, or refrigeration equipment is installed on the roof of an
apartment complex, a 125-volt, 15- or 20-ampere rated receptacle outlet _____. - ANS ✔✔shall
be located on the same level and within 25 feet of the heating, air-conditioning, or refrigeration
equipment
Where nonmetallic sheathed cable (NM) is run at angles with joists in unfinished basements,
the smallest three (3) conductor cable permitted to be installed directly to the lower edges of
the joists is size _____. - ANS ✔✔8 AWG
, All 125-volt, single-phase, 15- and 20-ampere rated receptacles installed in residential garages
shall be _____.
I. protected by a listed arc-fault interrupter
II. provided with ground-fault circuit-interrupter protection - ANS ✔✔II only
Where a 120-volt lighting branch-circuit is to supply only six (6) 100 watt, 120-volt, incandescent
luminaires, determine the approximate total current on this branch circuit. - ANS ✔✔5 Amperes
In a dwelling unit bedroom, any wall space that is at LEAST _____ feet or more in width must be
provided with a general use receptacle outlet. - ANS ✔✔two
The MINIMUM internal depth of a box that is intended to enclose a flush mounted device
supplied by 14 AWG conductors shall be _____. - ANS ✔✔15/16 inch
Receptacle outlets on a 20-ampere rated small appliance branch circuit serving kitchen
countertops in a dwelling unit are to be rated _____.
I. 15 amperes
II. 20 amperes - ANS ✔✔either I or II
Where a 40-gallon storage-type electric water heater has a nameplate rating of 4,500 watts @
240 volts, what is the MAXIMUM standard size circuit breaker the NEC® permits to protect the
water heater? - ANS ✔✔30 amperes
Given: You are to install a 20 ampere, 120 volt, GFCI-protected, buried, branch circuit that
supplies landscape lighting for a residence. If UF cable is used for this installation, it is required
to have a ground cover of at LEAST __________. - ANS ✔✔12 inches
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. - ANS
✔✔six
comprehensive revision material
All single-phase, 15 or 20-ampere branch-circuits supplying outlets or devices installed in
residential kitchens or similar rooms, shall be protected by a listed arc-fault circuit interrupter of
the _____ type. - ANS ✔✔Combination
In dwelling units, hallways of _____ feet or more in length are required to have at least one (1),
15- or 20-ampere rated 125-volt receptacle outlet. - ANS ✔✔10
Electrical outlet boxes installed in walls and ceilings are required to be __________. - ANS
✔✔accessible
Raceways installed in solid rock shall be permitted to be buried at lesser depths than generally
required, when covered by at LEAST _____ inches of concrete, extending down to the rock. -
ANS ✔✔two
The MINIMUM number of 120-volt, 15-ampere, general lighting branch circuits required for a
dwelling that has 70 feet by 30 feet of habitable space is _____. - ANS ✔✔4
When the heating, air-conditioning, or refrigeration equipment is installed on the roof of an
apartment complex, a 125-volt, 15- or 20-ampere rated receptacle outlet _____. - ANS ✔✔shall
be located on the same level and within 25 feet of the heating, air-conditioning, or refrigeration
equipment
Where nonmetallic sheathed cable (NM) is run at angles with joists in unfinished basements,
the smallest three (3) conductor cable permitted to be installed directly to the lower edges of
the joists is size _____. - ANS ✔✔8 AWG
, All 125-volt, single-phase, 15- and 20-ampere rated receptacles installed in residential garages
shall be _____.
I. protected by a listed arc-fault interrupter
II. provided with ground-fault circuit-interrupter protection - ANS ✔✔II only
Where a 120-volt lighting branch-circuit is to supply only six (6) 100 watt, 120-volt, incandescent
luminaires, determine the approximate total current on this branch circuit. - ANS ✔✔5 Amperes
In a dwelling unit bedroom, any wall space that is at LEAST _____ feet or more in width must be
provided with a general use receptacle outlet. - ANS ✔✔two
The MINIMUM internal depth of a box that is intended to enclose a flush mounted device
supplied by 14 AWG conductors shall be _____. - ANS ✔✔15/16 inch
Receptacle outlets on a 20-ampere rated small appliance branch circuit serving kitchen
countertops in a dwelling unit are to be rated _____.
I. 15 amperes
II. 20 amperes - ANS ✔✔either I or II
Where a 40-gallon storage-type electric water heater has a nameplate rating of 4,500 watts @
240 volts, what is the MAXIMUM standard size circuit breaker the NEC® permits to protect the
water heater? - ANS ✔✔30 amperes
Given: You are to install a 20 ampere, 120 volt, GFCI-protected, buried, branch circuit that
supplies landscape lighting for a residence. If UF cable is used for this installation, it is required
to have a ground cover of at LEAST __________. - ANS ✔✔12 inches
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. - ANS
✔✔six
