Online Calculators and Tables to Help You Determine Proper Wire Size


The Distance Between Conduit Supports Calculator will calculate the maximum allowable distance between supports for rigid metallic and non-metallic conduit.

Distance Between Rigid Metallic Conduit Supports


Enter the information below to calculate the distance between supports.



Distance between supports: -

Note: 1 foot is approximately 0.3048 meters.

Source: NFPA 70, National Electrical Code Table 344.30(B)(2)

Distance Between Rigid Non-Metallic Conduit Supports


Enter the information below to calculate the distance between supports.



Distance between supports: -

Note: 1 foot is approximately 0.3048 meters.

Source: NFPA 70, National Electrical Code Table 344.30(B)(2)

To calculate wire size for a circuit, use the Wire Size Calculator or the Advanced Wire Size Calculator. To calculate wire ampacity for a circuit, use the Wire Ampacity Calculator or the Advanced Wire Ampacity Calculator.


For long conductor runs where voltage drop may be an issue, use the Voltage Drop Calculator to determine proper conductor sizing and maximum circuit length. Visit the Tables page to view reference tables such as Maximum Ampacity for Current-Carrying Conductors.


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