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Wire Sizing for Electricians

This document is a wire size calculator that allows the user to input start voltage, temperature, wire length, current, and allowable voltage drop to calculate the minimum wire gauge required for an electrical wire run. The results provided include maximum voltage drop, wire resistance, minimum gauge required, and end voltages. Notes explain that the minimum gauge is theoretical and to round up to the next standard gauge size if needed. A negative gauge result indicates an even larger wire size is required.

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hamza mandlwi
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231 views2 pages

Wire Sizing for Electricians

This document is a wire size calculator that allows the user to input start voltage, temperature, wire length, current, and allowable voltage drop to calculate the minimum wire gauge required for an electrical wire run. The results provided include maximum voltage drop, wire resistance, minimum gauge required, and end voltages. Notes explain that the minimum gauge is theoretical and to round up to the next standard gauge size if needed. A negative gauge result indicates an even larger wire size is required.

Uploaded by

hamza mandlwi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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Wire Size Calculator

General Information Wire Run Information


Start Voltage Volts Wire Length (One Way) Feet
Temperature 75 Deg. F. Current through Wire Run Amps
Allowable Drop 10.0 %

Low Battery 10.20 Volts


Results
Max Voltage Drop 0 Volts
Max. Wire Resistance Error Ohms
Minimum Wire Gauge Req. Error AWG
Actual Wire Resistance Error Ohms
End Voltage Error Volts
End Voltage at Low Battery Error Volts

Notes:
Job:
Location:
Calculate
Power Supply ID:

Date: 2/10/2022
Help

Help
Help for Wire Size Calculator

The Voltage Drop Calculator calculates the voltage through a given wire run based on wire size, length, load current, and
other factors.

Step 1: Enter the starting voltage, ambient temperature in degrees fahernheit, and allowable voltage drop in percentage
into the cells in the "General Information" box. Use 75 degrees if the ambient temperature is not known.

Step 2:
Enter the wire length in feet and current drawn through the wire in amps into the "Wire Run Information" box.
The wire length should be entered as a "one way" length and should not be doubled to account for source and
return wires.

Step 3: Click the blue "Calculate" button. The results appear in the "Results" box. The "End Voltage" cell gives the
voltage the load will see if the recommended wire size is used. The "End Voltage at Low Battery" cell gives the
voltage the load will see when the battery set is fully discharged (by UL definition).

Note:
The Min. Wire Gauge Required is the theoretical minimum wire gauge required to maintain an end voltage within
the percentage entered. Round up to the next standard wire gauge if a non-standard wire gauge is indicated.

Note: A negative number in the Min. Wire Gauge Required cell indicates a required wire larger than AWG 0. A result of
-1 converts to AWG 00, a result of -2 converts to AWG 000, and so on.

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