18 Questions
What are bus bars?
Large non-circular conductors found in main switchboards
Which of the following is a function of insulators?
Prevent the flow of electrons
What do conduits primarily enclose?
Wires and cables
What type of outlet is intended for direct connection to a lighting fixture?
Lighting outlet
In the context described, what do switches primarily do?
Make, break, or change conditions in electrical circuits
What is the primary function of a service switch according to the text?
Disconnect all electric service in a building except emergency equipment
What type of switches are used when it is desired to control lamps from two different points, such as in a stairwell?
Three-way switches
Which protective device consists of an alloy link of wire with a low melting temperature inserted in the circuit?
Fuses
What type of protective device provides ground fault protection and also functions as an ordinary circuit breaker?
Ground fault circuit interrupters
Where are the protective devices housed in interior wiring installations?
Panelboards
Which type of switches are used with two 3-wire switches to control lamps from three or more desired points?
Four-way switches
What is the function of switchboards in interior wiring installations?
House protective devices and bus bars
What is the purpose of a branch circuit?
To supply electricity to a single specific item
Where do feeder circuits extend from and to?
From the main switchboard to the distribution panel boards
What is the function of sub feeder circuits?
To distribute power from main feeders to smaller local panel boards
What is the role of a distribution panel?
To distribute power to other panels or heavy power-consuming loads
Where does low voltage alternating current below 50 volts come from in residential systems?
From a step-down transformer
What is the point of delivery of electricity to a building by a public utility company called?
Service entrance
Test your knowledge on various components of electrical systems such as cables, bus bars, insulators, conduits, and raceways. Learn about different materials and structures used in electrical installations.
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