User’s Guide — 53
Finding Motor Branch-Circuit
Wire Size & Conduit Size —
Same Wire Type & Size
What size THHN copper wire & RMC
conduit are needed to connect a 10 HP
1Ø induction motor to a 115 volt source?
Steps
Keystrokes
Display
Reset calculator
[Set] [x] [On/C]
0.
Set to 1-phase
[Set] 1
1 PH
Enter volts
115 [Volts]
115. VOLT
Enter horsepower
10 [HPmotor]
10. HP IND
Enter cond. type
8 [Set] [CondSz]
nonE
RMC
Display full load
amps
[Amps]
100. FLC A
Find wire size
[Set] [WireSz]
0 CU
AWG WIRE SIZE 125%
Find wire ampacity [WireSz]
0 125.0*
WIRE A125%
Find conduit size
[CondSz]
1.25 in
RMC COND SIZE
Find total # wires
[CondSz]
2. TTL WIRES
Find conduit fill % [CondSz]
24.3
FILL COND %
Find act. fill area
[CondSz]
0.3710
FILL TTL WIRE AREA
Find rem. area
[CondSz]
0.1021
REM WIRE AREA
NOTE: Display will also show wire size in upper
left when displaying maximum ampacity rating.
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