A1 LT11 Flashcards
What type of switch is required for lamps and devices operating on 120 V AC?
Single-pole
What are the wires called that connect the three-way switches?
Travellers
What type of switch is needed for controlling 240 V loads?
Double pole
What is the purpose of a four-way switch?
To control lights from multiple locations (3 or more)
What type of switch is necessary for three-phase loads?
Three-pole
What are four-way switches used in combination with?
three-way switches
What are snap switches used to control?
Incandescent and fluorescent lamps.
Where can four-way switches be used?
long hallway or two flights of stairs
What are the three most common types of snap switches?
Single-pole switch, three-way switch, four-way switch.
What type of switch is used to control a light from two different locations?
Three-way switch
How many terminals does a three-way switch have?
3
Why is a spring included in nearly all switches?
To aid movement of contacts and minimize arcing
What information should switches have marked on them?
Rated voltage and current
Should the loads controlled by switches exceed their rated values?
No
What is the internal operating method of most switches?
Fixed and movable contacts
