Wire Sizing Guide

Ace Industries Wire Sizing Guide

Wire Sizing Selection Tables

There are several factors that must be considered before determining the proper size wire to select for an application. Items you must consider are:

  • Source Voltage
  • Number of Phases
  • Horsepower or amperage of the motor(s)
  • Length of the Cable or Run

The charts below contain recommended minimum wire size (AWG) for different voltage, horsepower and cable length combinations. These charts are only a guide. Please consult the National Electric Code (NEC) and any applicable local standards for exact requirements.

Single Phase (115 Volt) - Wire Size Selection Guide*

HP Cable Length
Up to 30" 31" - 50" 51" - 75" 76" - 100" 101" - 150"
1/2 14 14 12 10 8
3/4 14 12 10 10 8
1 14 12 10 8 6
1-1/2 12 10 8 8 6
2 12 10 8 6 6
3 10 8 6 6 4

Single Phase (230 Volt) - Wire Size Selection Guide*

HP Cable Length
Up to 30" 31" - 50" 51" - 75" 76" - 100" 101" - 150"
1/2 14 14 14 14 14
3/4 14 14 14 14 14
1 14 14 14 14 12
1-1/2 14 14 14 14 12
2 14 14 14 12 12
3 14 14 12 12 10

 

Three Phase (208 Volt) - Wire Size Selection Guide*

HP Cable Length
Up to 30" 31" - 50" 51" - 75" 76" - 100" 101" - 150"
1/2 14 14 14 14 14
3/4 14 14 14 14 14
1 14 14 14 14 14
1-1/2 14 14 14 14 14
2 14 14 14 14 14
3 14 14 14 14 12
5 14 14 12 12 10
7-1/2 14 12 10 10 8
10 14 12 10 8 6
15 12 10 8 6 6
20 12 8 8 6 4
25 10 8 6 4 4

Three Phase (230 Volt) - Wire Size Selection Guide*

HP Cable Length
Up to 30" 31" - 50" 51" - 75" 76" - 100" 101" - 150"
1/2 14 14 14 14 14
3/4 14 14 14 14 14
1 14 14 14 14 14
1-1/2 14 14 14 14 14
2 14 14 14 14 14
3 14 14 14 14 12
5 14 14 12 12 10
7-1/2 14 12 10 10 8
10 14 12 10 8 6
15 12 10 8 6 6
20 12 8 8 6 4
25 10 8 6 4 4

Three Phase (460 Volt) - Wire Size Selection Guide*

HP Cable Length
Up to 30" 31" - 50" 51" - 75" 76" - 100" 101" - 150"
1/2 14 14 14 14 14
3/4 14 14 14 14 14
1 14 14 14 14 14
1-1/2 14 14 14 14 14
2 14 14 14 14 14
3 14 14 14 14 14
5 14 14 14 14 14
7-1/2 14 14 14 14 14
10 14 14 14 14 12
15 14 14 14 12 12
20 14 14 14 12 10
25 14 14 12 10 10

 

 

*CAUTION: - The information provided in these charts is for reference only and not intended to provide complete requirements or qualifications for selecting the proper cable size for various conductor lengths. The requirements of the National Electric Code (NEC) and any applicable local codes must always be followed when determining proper wire sizes. Use this information for reference only.