30 Questions
What is a key step in the electrical design process that involves computing panel loads and feeder sizes?
Checking the preceding work
In a two-story building, how are lighting panels typically installed?
Recessed into corridor walls
What is usually integrated into a single unit in private residence electrical design?
Main disconnect and main switch breaker
What is the purpose of having a minimum of 42 inches of clear working space in front of electrical panels?
To facilitate easy access for maintenance
In what scenario would an electric closet be advisable for accommodating electrical panels?
In a six-story building or higher
Where are lighting panels typically located in a commercial space with a building that is six stories high or more?
Grouped in an electric closet
What is a key consideration for electrical wiring design in terms of flexibility?
Accommodating all possible electric loads
How is reliability in electrical wiring design determined?
By the utility's service and the building's electrical system
What should a designer be constantly alert to in terms of safety during electrical wiring design?
Electric hazards caused by misuse or equipment failure
How does the first cost of an electrical wiring system relate to owning cost?
Lower first cost leads to higher owning cost
What is a misconception regarding space allocation in electrical wiring design?
All electrical equipment is easily concealed
How are the operating costs of an electrical wiring system primarily influenced?
By energy consumption
What is the recommended limit for the number of receptacles on a 15-amp circuit?
6 receptacles
Where should a duplex appliance outlet be installed in a kitchen?
Every 36 inches of counter space
Why is it recommended to provide disconnecting means for electric ranges, cooktops, and ovens?
To ensure safety and accessibility
What item can help lessen vandalism and discourage prowlers in addition to illuminating the house at night?
Perimeter lighting
In what area of a bedroom should duplex outlets be supplied?
At each side of the bed location
What information is typically included in a panel schedule when circuiting loads?
Wattage of load, current rating, and circuit number
What is the purpose of an electric closet in a building's electrical system?
To group electrical equipment for convenience
Why is it important for electric closets to have vertically stacking doors?
To fit architectural and electrical demands
What is the primary function of an overcurrent device in an electrical circuit?
To interrupt the circuit when current exceeds rating
Why should electric closets have sufficient wall space?
To mount panels, switches, and transformers
What is a likely consequence of not having floor slots or sleeves in electric closets?
Difficulty in future installations of conduits
Why is it advantageous to vary the shape of the space in an electric closet?
To fit architectural and electrical demands
How are spare circuits typically figured in terms of load?
At approximately the same load as the active circuits
When calculating panel load, what percentage of the office building area is assumed to be corridors and storage?
15%
How many panels are required for the office building mentioned in the example?
Three panels
What is the purpose of preparing a riser diagram in electrical work?
To show the vertical relationships of devices and components
In practice, why are additional circuits provided apart from those needed for lighting and receptacles?
For spare circuits and receptacles
In the context of electrical work, what is shown on a riser diagram?
Vertical relationships of important components
This quiz covers the general considerations for electrical wiring design, such as flexibility and reliability. Learn about incorporating flexibility in branch circuitry, feeders, and panels, as well as factors influencing the reliability of the wiring system.
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