7/30/2023 0 Comments 4 awg ampacityOther factors can affect the capacity of wire besides the length, and this includes if it is in a hot environment, duration of load, stranded vs. When in doubt about the load go up a gauge. It is almost always OK to use a larger gauge wire. From what it looks like in many automotive applications a 5% or more voltage drop is more common.Īs a general rule, the smaller the diameter of the wire the higher the resistance and thus lower current capability over a given length. ![]() We prefer using the 2% mark as a conservative value and to ensure delivering full potential to any needed electrical source. The voltage drop value will vary depending on your application. We don't because it's overkill for most of our customers and there are not enough customers to warrant getting into selling it. A few sources exist for Teflon wires, aircraft supply, surplus sometimes, even a few racing places are starting to sell it. Sometime you may see wire called PTFE, PTF for Teflon as well. Typical temperature range for Teflon is -60C to 200C (-76F to 392F) and Tefzel is -70C to 150C (-94 to 302F). If you are going to get Teflon or Tefzel wire, it will be silver plated conductors and expensive. We have seen Teflon wires with a temp rating of 105C(221F) which is below the typical cross-linked as indicated above. One other note about wire type is Teflon and Tefzel are generally very good wire but expensive. GXL, and TXL wires are oil, gas, acid and generally chemical proof. TXL (SAE J1128-TXL) - Extra thin insulation, Automotive Cross-link Wire rated -49F to 257F. ![]() GXL (SAE J1128-GXL) - Thin insulation, Automotive Cross-link Wire rated -49F to 257F.GPT wire (SAE J1128-GPT) - General Purpose Wire rated -40F to 176F (Generic wire found in most auto parts stores).While shopping for wire, you may see wire with specs like. You are unlikely to find GXL/TXL wire in a parts store. We have found that the "big box" automotive parts stores sell GPT wire (General Purpose Wire) that we do not recommend for use in high temperature applications, such as under hood. You don't want to run common cheap wire in a hot engine compartment, so make sure that you know the temperature range of your application and the temperature rating of the wire you are using. ![]() When doing automotive wiring it is important to use the proper wire in the proper place, and this also goes for the operating temps of wire plastic casings (insulation). This can be helpful if doing your own repairs or adding custom wiring to make sure each circuit is not overloaded. ![]() IF YOU WISH TO CALCULATE AN EQUIVALENT AWG FOR COMBINED WIRES (Example: Two 18 AWG + Three 14AWG Wires = _AWG, > CLICK HERE FOR COMBINED AWG CALCULATORĪutomotive Wire Size Calculator This is a simple calculator for determining approximate wire gage/size based on the length of the wire (in Feet) and the current (in Amps) in general Automotive applications.
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