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This site offers many simple-to-use calculators and wire ampacity charts to aide you in properly sizing wire and conduit in compliance with the NEC. Visit the Calculators and Tables pages for a complete list of resources.
- Calculators
Calculates the full-load amps, wire size, breaker size,...
- Tables
Wire Size Correction Factors: Contains correction factors to...
- Wire Size Chart
Wire Size Chart. Electrical current is measured in amps....
- Motor Data
Note: The wire size in this table is based on 75°C...
- 40 C
Wire Size Chart: Allowable Ampacities of Conductors in Free...
- Three-Phase Ac Motors
Full-Load Amps of Three-Phase Alternating Current Motors....
- Wire Ampacity Correction Factors
For ambient temperatures other than 30°C (86°F), multiply...
- Distance Between Conduit Supports
Source: NFPA 70, National Electrical Code, Table...
- Calculators
Wire Size Chart. Electrical current is measured in amps. Each wire size, or wire gauge (AWG), has a maximum current limit that a wire can handle before damage occurs. It is important to pick the correct size of wire so that the wire doesn't overheat.
This calculator is based on NEC (NFPA 70®: National Electrical Code® (NEC®), 2014 Edition) Table 310.15(B)(16-17). Enter the information below to calculate the ampacity for the selected wire gauge and given conditions.
Calculate the maximum allowable wire ampacity for an insulated conductor as directed by the most recent NEC ampacity tables and charts.
This table tells you what gauge wire (AWG or kcmil) you need to use for services and feeders ranging from 100 amps to 400 amps current. It gives us the AWG or kcmil number for copper and aluminum wires (same as copper-clad aluminum wires). We will look at the complete table further on. 310.12 (A) Services part.
This app uses the calculation requirements found in the 2017 National Electrical Code® to determine the ampacity of insulated conductors and certain cable-type wiring methods. This calculator also complies with the 2020 NEC requirements.
INGNEC 2014 Article 110.14(C) Temperature Limitations. The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the lowest temperature r.
