Pls 220 Flashcards
the full load current, or full load amp rating of any electric motor is the ______________________ it can safely draw from the line
max amt of current
where to find FLC rating on a motor
name plate
what table in the CEC is used to determine motors FLC
table 45
how to find minimum code conductor ampacity and from what code rule
- multiply FLC by 125%
-CEC 28-106
What table to find trade size conductors
T 1,2,3,4……
what code rule to find temperature limitations for conductors
CEC 4-006
Can trade size conductors be smaller then CEC calculated conductor ampacity
NO
Every electric motor and its branch cct require a ______________ means and some sort of __________ protection
-diconnecting
-overcurrent
What are type P fuses
non time delay
what are type D fuses
time delay
what are the 3 types of overcurrent devices
-type P fuses (non time delay)
type D (time delay)
-cct breakers
Why do motors create a surge when the electric motor starts
-large inrush current needed to start the electric motor
What code rule and table is used to size overcurrent devices
-CEC 28-200
-Table 29
What are standard trade sizes for saftey switches
30,60,100,200,400,600A
In non-fused switches the ampere rating of the load determines the _____________ size
disconnect switches
In fused diconnects, the ampere rating of the chosen fuse determines the ___________________ size
disconnect switch
What are bonding conductors used for
bond to ground the non-current carrying metal parts of the electric motors branch cct
What section of the CEC indicates about bonding and what table
section 10
- 10-616 1)
-Table 16
does the bonding conductor need to be larger then the supply conductor
no
What CEC section is used for overloads
26-306
A motor drawing more current than its FLC is ______________
overloaded
What happens if a motor is overloaded
-motor overheats
-burn out motor windings
What is the purpose of the overload device
-shut down the motor before its windings are destroyed
overload devices operate on a _______________ baisis
time-lags