Switching Circuits Flashcards
When encountering an unusual symbol, typically one can consult…?
The legend.
A momentary switch is…?
One that returns to its original position when force is removed.
What does the number of poles on a switch determine?
The number of circuits the switch can control.
What is a maintained switch?
One that stays in it’s position after a force is removed.
How many positions can a switch be put in?
The amount of throws indicated.
Is a single pole double throw switch sometimes called an A/B switch?
Yes.
Momentary switches are often used when…?
It is undesirable for the switch to be left on unintentionally.
How many terminals does a double pole double throw switch have?
6 terminals.
On a three way switch what colour is the common terminal?
Dark, almost black.
When wires cross in a drawing and there is no node, are they connected?
No.
Switches rated for 347V lighting may be installed in standard outlet boxes, true or false?
False, they require special boxes.
When controlling a load from two locations which is the “go-to” switch?
A three way switch.
What does a wiring diagram illustrate?
Electrical interconnection of components and their relative physical location.
What is the purpose of schematic diagrams?
To simply illustrate an electrical order of operations in a circuit.
What may schematic diagrams also be called?
- Elementary diagrams
- Ladder diagrams
In general the silver coloured terminal on devices connects to the…?
Grounded conductor
When labelling switches and loads, where must one put the labels?
- Above the switch.
- Inside the load.
Grounded conductors may not be switched, unless…?
The switch simultaneously disconnects all circuit conductors .
Four important rules to follow when making circuit connections are?
- Be sure equipment is rated for voltage and current it will receive.
- Arrange wiring neatly and use proper colours.
- Check for faults before energizing.
- If unsure, get help.
Why would a back door doorbell only make one sound?
Because one side of the magnetic solenoid core has a rubber stopper.
What kind of connection does the primary side of a class 2 transformer have?
Stripped wire leads.
What does the acronym PLANS stand for?
- Polarity - What way are electrons moving?
- Labels - Devices and loads
- Alignment - Ladder
- Nodes - No extra connections
- Symbols - Use a proper template
May a 4 way switch be used as a 3 way switch?
Yes as long as one input terminal is not used.
