Calculated Industries ElectriCalc Pro User Manual - 32 — E

32 — e

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alc

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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:

(3Ø)

3Ø  

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:

(1Ø)

  1 Ø  

1  Ph