Calculated Industries ElectriCalc Pro User Manual - — 9

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Wire sizing Keys

The ElectriCalc Pro uses NEC Table 310.15(B)(16) (310.15(B)(17) 

for Free Air) to find Wire Sizes and Ampacity ratings of wires. The 

calculator uses the following data to calculate Wire Size: 

1) Insulation temperature rating (60°C, 75°C and 90°C)

2) Wire material (Copper or Aluminum) 

3) Ambient Temperature 

Standard AWG Wire Sizes and Circular Mils are used by the 

ElectriCalc Pro. Wire Size entries less than or equal to 2,000 are 

accepted as AWG Wire Sizes; entries greater than 2,000 are 

accepted as Circular Mil entries and display the corresponding AWG 

Wire Size. Entries must match the standard Wire Sizes or Circular 

Mils; otherwise, 

none will be displayed (invalid entry).

Note: 1/0, 2/0, 3/0 and 4/0 wires are entered using the  key  

(e.g., 0, 00, 000 and 0000).

Wire size/ampacity — Enters or calculates Wire 

Size based on Ampacity and Voltage Drop, if a 

Voltage Drop Length has been entered.

♦ First Press 

If a Wire Length has been entered, the first 

press will show the larger of the Ampacity or 

Voltage Drop derived Wire Size. The calculator 

will use the larger value when calculations 

require a Wire Size. If no Voltage Drop Length 

has been entered, the calculator will display the 

calculated Ampacity-rated Wire Size.

♦ Second Press  

If a Wire Length has been entered, the second 

press displays the smaller of the two Wire 

Sizes. If not solving for Voltage Drop Wire Size, 

then displays the maximum Ampacity.

♦ Third Press 

Displays the Wire Size in Circular Mils.

(cont’d)