NEC Commercial Electrical Test #2
Exam Questions & Answers (Grade
A+)
If an apartment complex contains 40 units with a 12 Kw range in
each, what is the total kw rating for all the ranges that must be
used in calculating the electric services?
(Table 220.55 Demand Factor for ranges, ovens etc.) -
correct answer ✅55 kw
(Go to Column C - 31-40 appliance = 15kw + 1kw for each range.
Therefore 15kw + 40 kw "40 units" = 55 kw)
The working space shall be not less than ______ inches wide in
dead front of the electric equipment.
110.26 2 -
correct answer ✅30 inches
Unless not specified in this code, conductors normally used to carry
power shall be of ________.
110.5 -
correct answer ✅copper
Doors or covers of enclosures shall be locked, bolted and
underground box covers that weigh over ____ pounds shall be
considered as meeting this requirement.
,NEC Commercial Electrical Test #2
Exam Questions & Answers (Grade
A+)
110.32 D -
correct answer ✅100 lb
Accessory building that has a floor located at or below grade level
not intended for habitation and limited to storage areas, work
areas, and areas of similar use are required to have outlets that are
__________.
(210.8 A) -
correct answer ✅provided with ground-fault circuit interrupter
protection (GFCI)
Branch circuits feeding lighting , central alarm, signal,
communication, or other public or other purposes for public or
common areas of a two-family or multifamily dwelling _________
supplied from equipment that supplies an individual dwelling unit
or tenant space.
(210.25 B) -
correct answer ✅shall not be
A feeder is ___________.
,NEC Commercial Electrical Test #2
Exam Questions & Answers (Grade
A+)
100 -
correct answer ✅all circuit conductors between the service and
the final branch-circuit over-current device
The minimum branch circuit rating for electric ranges with a
nameplate rating of 8 3/4 kW or more is ________ amperes.
(210.19 A 3) -
correct answer ✅40 amp
Residential small appliance loads are calculated at _______ watts
each.
(220.52 A) -
correct answer ✅1500 watts (volt-amperes)
Service drop conductors, when not in excess of 600 volts to ground,
accessible to pedestrian that pass over residential sidewalk must
have a minimum clearance of _______ feet.
(230.24 B 1) -
correct answer ✅10 ft
, NEC Commercial Electrical Test #2
Exam Questions & Answers (Grade
A+)
The allowable number of service disconnecting means shall consist
of not more than _________ sets of circuit breakers.
(230.71) -
correct answer ✅6 sets
Service conductors that pass over a flat roof must have what
clearance of _____ feet from the highest point of roof over which
they pass.
(230.24 A) -
correct answer ✅8 ft
For a one-family dwelling, the service disconnecting means shall
have a rating of not less than ___ amps, 3-wire.
(230.79 C) -
correct answer ✅100 amps
The minimum size grounding electrode conductor for an AC system
with a 250 kcmil copper service entrance conductor is No_______
copper.
(Table 250.66) -
correct answer ✅2 awg
Exam Questions & Answers (Grade
A+)
If an apartment complex contains 40 units with a 12 Kw range in
each, what is the total kw rating for all the ranges that must be
used in calculating the electric services?
(Table 220.55 Demand Factor for ranges, ovens etc.) -
correct answer ✅55 kw
(Go to Column C - 31-40 appliance = 15kw + 1kw for each range.
Therefore 15kw + 40 kw "40 units" = 55 kw)
The working space shall be not less than ______ inches wide in
dead front of the electric equipment.
110.26 2 -
correct answer ✅30 inches
Unless not specified in this code, conductors normally used to carry
power shall be of ________.
110.5 -
correct answer ✅copper
Doors or covers of enclosures shall be locked, bolted and
underground box covers that weigh over ____ pounds shall be
considered as meeting this requirement.
,NEC Commercial Electrical Test #2
Exam Questions & Answers (Grade
A+)
110.32 D -
correct answer ✅100 lb
Accessory building that has a floor located at or below grade level
not intended for habitation and limited to storage areas, work
areas, and areas of similar use are required to have outlets that are
__________.
(210.8 A) -
correct answer ✅provided with ground-fault circuit interrupter
protection (GFCI)
Branch circuits feeding lighting , central alarm, signal,
communication, or other public or other purposes for public or
common areas of a two-family or multifamily dwelling _________
supplied from equipment that supplies an individual dwelling unit
or tenant space.
(210.25 B) -
correct answer ✅shall not be
A feeder is ___________.
,NEC Commercial Electrical Test #2
Exam Questions & Answers (Grade
A+)
100 -
correct answer ✅all circuit conductors between the service and
the final branch-circuit over-current device
The minimum branch circuit rating for electric ranges with a
nameplate rating of 8 3/4 kW or more is ________ amperes.
(210.19 A 3) -
correct answer ✅40 amp
Residential small appliance loads are calculated at _______ watts
each.
(220.52 A) -
correct answer ✅1500 watts (volt-amperes)
Service drop conductors, when not in excess of 600 volts to ground,
accessible to pedestrian that pass over residential sidewalk must
have a minimum clearance of _______ feet.
(230.24 B 1) -
correct answer ✅10 ft
, NEC Commercial Electrical Test #2
Exam Questions & Answers (Grade
A+)
The allowable number of service disconnecting means shall consist
of not more than _________ sets of circuit breakers.
(230.71) -
correct answer ✅6 sets
Service conductors that pass over a flat roof must have what
clearance of _____ feet from the highest point of roof over which
they pass.
(230.24 A) -
correct answer ✅8 ft
For a one-family dwelling, the service disconnecting means shall
have a rating of not less than ___ amps, 3-wire.
(230.79 C) -
correct answer ✅100 amps
The minimum size grounding electrode conductor for an AC system
with a 250 kcmil copper service entrance conductor is No_______
copper.
(Table 250.66) -
correct answer ✅2 awg
