Residential Electrical Services Questions With Complete
Solutions.
Which of that following locations at dwelling units require GFCI protection?
Receptacles within gaarages
Which type of cable with a corrugated sheath has a maximum bend raduis of 7 times the cable
diameter?
Type MC
Which of the following circuits require a minimum of 20A of overcurrent protection?
Residential small appliance branch circuits
According to the NEC, which of the following is required for the small appliance loads in each kitchen
area?
Two 120V, 20A small appliance branch circuits
According to NEC Section 220.53, loads for which of the following appliances shall be permissible to
apply a demand factor of 75%?
Fixed appliances
The NEC allows the load calculation for the ground neutral conductor supplying electric ranges and
dryers to have a demand factor of ______.
70%
Which of the following is required to carry the lighting load for the residence in the figure above?
Two 15A circuits
How many square feet of livable space are in the home in figure above?
1,200
Which of the following is the minimum NEC lighting load requirement for the home in the figure above?
3,600VA
Which of the following is an NEC-approved grounding electrode?
Metal underground water pipe in direct contact with the earth for 10 feet
The minimum clearance of service drop conductors over a residential driveway is reduced to 12 feet
when the voltage is limited to ________.
300V to ground
The section of the NEC that lists the requirements for installing service disconnecting means is ______.
NEC Section 230.70
Solutions.
Which of that following locations at dwelling units require GFCI protection?
Receptacles within gaarages
Which type of cable with a corrugated sheath has a maximum bend raduis of 7 times the cable
diameter?
Type MC
Which of the following circuits require a minimum of 20A of overcurrent protection?
Residential small appliance branch circuits
According to the NEC, which of the following is required for the small appliance loads in each kitchen
area?
Two 120V, 20A small appliance branch circuits
According to NEC Section 220.53, loads for which of the following appliances shall be permissible to
apply a demand factor of 75%?
Fixed appliances
The NEC allows the load calculation for the ground neutral conductor supplying electric ranges and
dryers to have a demand factor of ______.
70%
Which of the following is required to carry the lighting load for the residence in the figure above?
Two 15A circuits
How many square feet of livable space are in the home in figure above?
1,200
Which of the following is the minimum NEC lighting load requirement for the home in the figure above?
3,600VA
Which of the following is an NEC-approved grounding electrode?
Metal underground water pipe in direct contact with the earth for 10 feet
The minimum clearance of service drop conductors over a residential driveway is reduced to 12 feet
when the voltage is limited to ________.
300V to ground
The section of the NEC that lists the requirements for installing service disconnecting means is ______.
NEC Section 230.70
