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AWG Calculator

AWG Calculator


AWG Calculator

This app assists the aircraft airframe and powerplant (A&P) mechanic in determining the correct American Wire Gauge (AWG) wire size for given conditions, according to procedures outlined in FAA Publication AC 43-13 1B (Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair), Chapter 11. 

Conditions include circuit length, current, voltage, wire temperature (known or estimated) and derating factors for both altitude and wire bundle size/loading percentage.

The app also contains utilities that enable the aircraft mechanic to determine the following parameters without hands-on use of the AC 43-13 (when field/shop conditions make it impractical). Figures are referenced:

- Maximum Wire Length (standard temperature). 
-- Input parameters: circuit voltage, current, current flow and AWG. 
-- Output: L1.
-- Ref: AC 43-13 1B, Fig 11-2/3 

- Maximum Current (standard temperature). 
-- Input parameters: circuit voltage, current flow, wire length and AWG. 
-- Output: Max Current.
-- Ref: AC 43-13 1B, Fig 11-2/3 

- Altitude Deration Factor. 
-- Input parameter: Max Altitude. 
-- Output: Altitude Deration Factor.
-- Ref: AC 43-13 1B, Fig 11-5

- Bundle Deration Factor. 
-- Input parameters: Wire Count and Loading Percentage 
-- Output: Bundle Deration Factor.
-- Ref: AC 43-13 1B, Fig 11-

- IMAX (elevated temperature). 
-- Input parameters: ambient temperature, conductor temperature rating and AWG. 
-- Output: IMAX.
-- Ref: AC 43-13 1B, Fig 11-4a/b

- Bundle Builder (NEW!)
  -- Input parameters: number of wires, awg sizes, wire currents, maximum altitude, ambient temperature, wire rating, loading factor
  -- Output: Bundle IMAX (derated for bundle and altitude) with table for IMAX per wire.
  -- Ref: AC 43-13 1B, Fig 11-4a/b

When a chart does depict data due to input/output parameters exceeding chart limits, data is extrapolated and an appropriate warning ("** extrapolated data") is shown.


The user of AWG CALCULATOR for any specific application without an independent verification of its accuracy does so at his/her own risk and assumes any and all liability resulting from such use. No warranty is offered as to the accuracy of results. Users should have a thorough understanding of the relevant theoretical criteria. 

AWG Calculator
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