Calculated Industries 5065 - Manual (Page 40)

User’s Guide — 35
Re-sizing Wire Based on
Different Insulation Ratings
What wire size is required for a 3Ø, 75°C
copper branch circuit carrying a load of
260 Amps? What would the wire size be
if 90°C copper is used?
Steps Keystrokes Display
Clear calculator
o o
0.
Set to 3-phase
S 3
3 PH
Set to 75°C
S 7
3Ø 75 Cu 3 PH
Enter Amps
260 A AMPS 260.
Find wire size
w
AWG 300 CU
WIRE SIZE
Change to 90˚
S 9
AWG 0000 CU
WIRE SIZE
Reset to 60˚
S 6 o 3Ø 60 Cu 0.
and Clear
Wire Sizing Based
on Ambient Temperature
Find the 90°C copper wire size needed
to connect a 47,700 Volt-amp load to a
240 Volt, single-phase source. What is
the adjusted wire size, if the ambient
temperature rating is changed from the
default 30°C to 40°C?
Steps Keystrokes Display
Clear calculator
o o
0.
Set to 1-phase
S 1
1 PH
Set to 90°C
S 9
1Ø 90 Cu 1 PH
Enter VA
4 7 7 0 0 V
VA 47,700.
(Cont’d)