Residential Wiring Exam Questions with Correct
Verified Solutions
What is the meaning of calculated load?
Values that are required by the NEC for branch circuits, feeders, and the service. The
calculations for calculating loads in one-and two-family homes are found in NEC Article 220.
How are branch circuits rated?
Rated in accordance with the maximum permitted ampere rating or setting of the overcurrent
device.
NEC Article 210.18
How is the rating of the branch-circuit protective device affected when the conductors used
are of a larger size than called for by the code?
The ampere rating or setting of the specified overcurrent device shall determine the circuit rating.
NEC Article 210.18
What dimensions are used when measuring the area of a building?
Square footage
What spaces are not included in the floor area when calculating the load in voltage-
amperes per square foot?
-Open porches
-Garages
, -Unused or unfinished spaces not adaptable for future use
NEC Article 220.11 - Floor Area
What is the lighting unit load per square foot for dwelling units?
Cannot be less than 33 volts than 33 volts-amperes/m^2 (3 volt-amperes/ft^2).
NEC Article 220.14 (J) Dwelling Units
According to NEC 210.50 (C), a laundry equipment outlet must be placed within _______ ft
(m) of the intended location of the laundry equipment.
1.8 m (6ft)
NEC Article 210.52 (C) Appliance Receptacle Outlets
How is the total load in volt-amperes for lighting purposes determined?
Minimum unit load and the floor area
NEC Article 220.14 (J)
How is the total lighting load in amperes determined?
Volt-amperes/volts = amperes
How is the required number of branch circuits determined?
What is the minimum number of 15-ampere lighting branch circuits required if the
dwelling unit has an occupied area of 4000 ft^2 (368 m^2)?
Verified Solutions
What is the meaning of calculated load?
Values that are required by the NEC for branch circuits, feeders, and the service. The
calculations for calculating loads in one-and two-family homes are found in NEC Article 220.
How are branch circuits rated?
Rated in accordance with the maximum permitted ampere rating or setting of the overcurrent
device.
NEC Article 210.18
How is the rating of the branch-circuit protective device affected when the conductors used
are of a larger size than called for by the code?
The ampere rating or setting of the specified overcurrent device shall determine the circuit rating.
NEC Article 210.18
What dimensions are used when measuring the area of a building?
Square footage
What spaces are not included in the floor area when calculating the load in voltage-
amperes per square foot?
-Open porches
-Garages
, -Unused or unfinished spaces not adaptable for future use
NEC Article 220.11 - Floor Area
What is the lighting unit load per square foot for dwelling units?
Cannot be less than 33 volts than 33 volts-amperes/m^2 (3 volt-amperes/ft^2).
NEC Article 220.14 (J) Dwelling Units
According to NEC 210.50 (C), a laundry equipment outlet must be placed within _______ ft
(m) of the intended location of the laundry equipment.
1.8 m (6ft)
NEC Article 210.52 (C) Appliance Receptacle Outlets
How is the total load in volt-amperes for lighting purposes determined?
Minimum unit load and the floor area
NEC Article 220.14 (J)
How is the total lighting load in amperes determined?
Volt-amperes/volts = amperes
How is the required number of branch circuits determined?
What is the minimum number of 15-ampere lighting branch circuits required if the
dwelling unit has an occupied area of 4000 ft^2 (368 m^2)?
