Calculated Industries 5065 - Manual (Page 54)

User’s Guide — 49
What is the calculated dual element and
single element fuse size for a 230 Volt,
3-phase, 50 HP induction motor? What
are the Instantaneous Trip and Inverse
Time Circuit Breaker requirements?
Steps Keystrokes Display
Clear calculator
o o
0.
Set to 3-phase
S 3
3 PH
Enter Volts
2 3 0 U VOLT 230.
Enter HP
5 0 h
IND 50. HP
Find full current
A
FLC 130. A
Find DE fuse size
D
AMPS 227.5 dE
Display % used
D
%FLC 175.
Find SE fuse size
S D AMPS 390. SE
Display % used
D
%FLC 300.
Find inv. time brkr
I
AMPS 325. b2
Display % used
I
%FLC 250.
Find ins. trip
breaker size
S I AMPS 1,040. b1
Display % used
I
%FLC 800.
What NEMA size starter is required for
a 575 volt, 3Ø, 20 HP induction motor?
Steps Keystrokes Display
Clear calculator
o o
0.
Set to 3-phase
S 3
3 PH
Enter Volts
5 7 5 U VOLT 575.
Enter HP
2 0 h IND 20. HP
Solve for
starter size
S h
STAR 2 SIZE
Starter Size
Fuse and Circuit Breaker Size