Safety Flashcards
Can a shock of 10000 V be as equally as deadly as a 120 V shock?
YES
What should you do before working on electrical equipment if possible?
Turn the power off
What is romex “processing?
Cutting new connections and re-strip insulation
If victim is suffering from electrical shock, what should you do?
Isolate victim from power source. If possible, turn off the electricity
What should you do if an accident occurs in the classroom?
Don’t panic - Help the situation -
Go to the office - Tell the teacher
Why should you never plug in a lab without the instructors consent?
To prevent shock because the instructor checks your lab to make sure your connections are correct
Electrical burns harm what part of the body?
Extensive internal damage
When working on circuits out of arms length, should a ladder be used that is made of metal or wood?
Wood
What do your muscles do when electric current is passing through them?
Contract
The lower the number or “gauge” of a piece of Romex, the
__________________ the diameter.
Larger
Name the 3 things a needle nose pliers can do to give you an advantage when working with wires.
“Fishing” wires
Cutting excess wires
Gives you leverage when your finger fails
Perfect for wrapping or hooking wires
We always use a # _______ size gauge on our Romex strippers.
14
What is the function of a 3-way switch?
Turns a fixture on in 2 different locations
How many terminals does a 3-way switch have?
4
What is the function of a single pole switch?
Turns a fixture on in one location
How many terminals does a single pole switch have?
3
A power plug has 3 terminals. What are they?
black(hot)
white (neutral)
Ground
The black wire is also known as the ____________ wire.
hot
The white wire is also known as the _________________ wire.
neutral
Where should you NOT store fixtures?
In your toolbox
What should you do if your scrap Romex is too long for the job?
leave it so it can be “processed” for other labs.
Where can you find how much Romex you need for a lab?
Under the Tools section of your lab or the teacher will tell you.
If two switches are needed, how will they appear on the lab drawing and
procedure sections?
As a rectangle in the lab drawing
What is the purpose of Instructor Sign Off #1?
To check your connections
What is the purpose of Instructor Sign Off #2?
Make sure switches are secure and to test the circuit
What could happen with too much conductor exposed?
short circuit
How much sheathing should be removed from Romex?
Slice 3 ½” to 4” of sheathing off of the Romex
How much insulation should be removed from the conductors?
Remove 5/8” to ¾” of insulation
Where does ALL Romex go when cleaning up or breaking down a lab?
In the green bucket
Draw a picture of the right way to attach a conductor to a terminal.
Why don’t you twist the two conductors together before attaching a wire nut?
Because it will loosen up and fall out
How many wires does a RED wire nut hold together?
3-4
How many wires does a YELLOW wire nut hold together?
2
What are the 3 reasons you should use the appropriate color pigtail for the job?
So you or the teacher don’t get confused when making the circuit
What two materials of are conductors made of?
Aluminum and copper
The larger the number of a conductor, the smaller
the…..
diameter
What is the minimum gauge of conductors?
1 AWG
What is the maximum gauge of conductors?
18 AWG
What does 14/2 stands for?
14 gauge with 2 conductors and 1 ground
What does 14/3 stands for?
14 gauge with 3 conductors and 1 ground
What is an advantage of copper wire?
Strong and resists oxidation
What is the main disadvantage of aluminum wire?
subject to problems as a result of oxidation and expansion
What is the definition of insulation?
a non-conductive covering
The size of a conductor depends on what factors?
- The amount of electricity that must be
conducted. - The length of the conductor.
- The type of environment in which the
conductor will be used.
What color wires are found in 14/2?
Black, White and copper
What color wires are found in 14/3?
Black, white, red and copper
What are the three shapes of boxes that we use in our class?
Square
Octogonal
Rectangular
What is the purpose of electrical boxes?
Protect people from electrical shock
Keep exposed conductors away from combustible
building material
What are the two things electrical boxes must be able to do?
Be strong enough to withstand the stresses put on them during installation
Resist bending or twisting while holding
fixtures or devices.
Name two of the three characteristics of “handy boxes” we use in our class.
Used for surface mounting
Seamless
Have rounded edges to prevent injury
What is the definition of an electrical “knockout”?
A weakened area on the box
that is designed to be easily removed so
wires can be brought into the box.
What is the definition of “ganging boxes”?
Method of joining small boxes
to create one large box that can
accommodate multiple devices.
What do box extensions do?
Provide additional volume when a box is
too crowded with wires
Bring a box flush to the wall or ceiling
surface when the box has been mounted
too deep.
What does a ground clip do?
A ground clip is a device that
is hooked over the edge of the box and
hold a wire in tight electrical contact with
the box.
