3 Phase & Motor Starters Flashcards
How many overloads are required to protect 3 phase?
3
Always check for _____ before working on any power circuit.
Voltage
A visual to tell if something is running?
Indicator lights
What does NEMA stand for?
National electrical manufacturing association
What 4 things make up a circuit:
1) Wiring
2) Source voltage
3) Switches
4) Load
When wiring a float switch, it should be wired in the _____ _____ position?
Normally open
What can be done to change the direction of any 3 phase motor
Switch A1 & A2
Wearable parts of a DC motor?
Brushes
Omega symbol stands for?
Ohms
What does a black box with yellow stripes mean?
250 VDC cranes
14 gauge wire is rated for how many amps?
20
DC stands for?
Direct current
What is the high voltage side of a step down transformer called?
Primary side
_____ _____ _____ are used to keep motor running without holding the start button in
Seal in tips
What voltage is supplied to a control transformer?
480 VAC
How many phases is a control transformer?
Single
A ______ ______ can be used to temporarily fix an electrical issue?
Jumper wire
What determines the size of a motor starter?
HP of motor
True or false:
A DC motor acts as a generator if it’s turned without power?
True
____ should always be neutral on a transformer?
X2
What is the initial surge of power going to a motor until it comes up to speed?
In rush current
What is wired into a circuit to control power of another component in the circuit
Control relay
Stop switches get wired in a ____.
Series
How do you find how many amps something uses?
Divide watts and voltage
I= P ➗ E
Motors under 20 HP are wired in a _____.
Y-configuration
How is a capacitor discharged in a motor?
It’s shorted
12 gauge wire is rated for how many amps?
25
IEC stands for?
International electrotechnical commission
A ____ ____ distributes electric in a home?
Load center
A black box indicates?
250 VDC
A ____ ____ is used to protect a control transformer?
Control fuse
What has to be supplied to the coil of a magnetic starter to close the moveable tips?
Voltage
Type of wire used in home wiring?
Romex
_____ take 480 VAC down to 120 VAC
Transformer
In it’s resting state, a stop button should be in the ____ ____ position?
Normally closed
Multiple stop buttons are wired in a _____?
Series
What is used in a motor circuit to protect motor from high current?
Overloads
The low voltage side of the transformer is called the _____?
Secondary
A ____ _____ is used to make a motor run
Motor starter
What wire should never be hooked to a switch?
Neutral
To check for proper rotation after changing a motor you should always do what?
Bump test
An example of a maintained button would be?
Emergency stop
What should a meger read phase to ground?
550 mega ohms
What should a meger read phase to phase?
OL
A ____ ____ can be mounted in any box as a convenient place to make electrical connections
Terminal strip
Red wire on a 3 way is called?
Traveller
Colored wire indicates ____ ____ in motor starter bucket?
Control voltage
10 gauge wire is rated for how many amps?
35
Losing a phase in 3 phase is refered to as?
Single phasing
When ringing a motor out with meter, phase to phase you should read?
.1 or above
FLA stands for?
Full load amps
What type of AC motor needs a boost to get started?
Single phase capacitor start
Checking phase to ground with a meter should read?
OL
What size wire should be used on a dryer or range?
10 guage
A ____ ____ is wired into a motor starter control in the event that the motor needs to be run in manual or auto jog?
Selector switch
What part of a DC motor rotates?
Armature
What does IEC stand for?
International Electrotechnical Commission
Start buttons are typically wired in ____?
Parallel
In a series circuit ____ stay the same and _____ adds?
Amps
Resistance
In a parallel circuit _____ stays the same and _____ add?
Voltage
Amps
A rheostat is a _____ _____?
Variable resistor
A _____ is used for direction?
Diode
What does a yellow wire in an electrical panel mean?
It’s fed from a secondary power source
What does MCC stand for?
Motor control center
