Calculated Industries 5070-A User Guide User Manual
Page 33
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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?
KeysTRoKe
DIsPlay
0.
1. Set to 3-Phase:
(3Ш)
3Ш
3 Ph
2. Set to 75º C:
(75º)
3Ø 75
3 Ph
3. Set to Copper (if necessary):
(Cu/Al)
3Ø 75 Cu
3 Ph
4. Enter Amps:
aMPs 260.
5. Find Wire Size:
aWG 300
Cu
WIRe sIZe
6. Change to 90º C:
(90º)
3Ø 90 Cu
aWG 0000
Cu
WIRe sIZe
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 20°C?
KeysTRoKe
DIsPlay
0.
1. Set to 1-Phase:
(1Ш)
1 Ш
1 Ph