Switching Circuits 030104e Flashcards
Four way switches can be used to operate a light from either of two locations? True or False.
True
How many terminals does a double pole double throw switch have?
6 terminals.
What kind of switch should be used when one load conductor is to be switched?
A single pole switch.
What does a break refer to with switches?
The number of breaks refers to the amount of circuit breaking contacts a device has.
What is another name for a single pole double throw switch?
Three way switch or A/B switch.
How many terminals does a double pole single throw have?
4 terminals.
What Voltage and amperes are residential single pole switches rated for?
15 A and 120 V ac
What are some common uses of single-pole switches?
Lighting circuits
120 V fractional horsepower motors
Appliances
Power tools.
What are some common uses of double-pole switches?
240 V electric heaters
Air conditioners
Appliances
Single-phase 240 V motors.
What are some common uses for three-pole switches?
Disconnecting means for motors.
Panelboards
Three-phase circuits.
What are some common uses for multi-position switches?
Pole lamps to operate multiple lamps on the light or three light levels of a tri-light bulb.
Forward/reverse motor starter controls.
Pull chain cam switches for ceiling fans.
What are schematic diagrams also known as?
Elementary diagrams or ladder diagrams.
What does the acronym PLANS stand for?
P - Polarity
L - Labels
A - Alignment
N - Nodes
S - Symbols
What are the horizontal conductors on a schematic diagram called?
Rungs which can be labelled with numbers to help understand a complex circuit.
Types of momentary contact switches?
Push Button
Float Switch
Flow Switch
Temperature Switch
Pressure Switch
Limit Switch
