Tefzel Wire

Tefzel wire is Race Spec's choice for wiring projects. Tefzel wire is used in many aerospace, motorsport, and industrial applications due to its chemical resistance and high heat capabilities. Tefzel wire is typically stranded tin-coated wire with either Crosslinked (M22759/32) or non-Crosslinked (M22759/16) insulation. Built for harsh environments, its super-tough ETFE insulation shrugs off extreme heat, chemicals, and radiation, making it ideal for aerospace, racing, and demanding industrial applications. Despite its thinness, it boasts superiority over other options with high voltage resistance and reliable performance.

Excerpt from RB Racing about Amperage Ratings for Tefzel /32 Wire

Amperage Ratings Mil-Spec 22759/16/32 Wire

The above chart gives a general amperage rating for the mil-spec 22759/16 and 22759/32 wires. In reality, it gets a little more complicated than this as wires have resistance and the longer they are the less capacity they have, and the greater the voltage drop. In a motorsports wiring harness the wires will be enclosed in DR25, twisted together, and not in free air, so there will be more heat, which further degrades their capacity.

The chart is based on maximum length to maintain a 5% VDc drop. For a more complete explanation on temperature rise in harnesses view this pdf.

In automotive use with longer runs here are safe recommendations:
Battery Positive Direct 10AWG
Battery Negative Direct 10AWG
Other Battery Positive 14AWG
Fuel Pump Positive 14AWG
Radiator Fan 14AWG
Switched Ignition 20AWG
12V 5A Fused 20AWG
Tach Output 20AWG
Sensors 20 AWG
Injectors 20AWG

22 AWG M22759/32 Tefzel Wire (Violet w/ Stripe)

22 AWG M22759/32 Tefzel Wire (Violet w/ Stripe) $ 0.58

Tefzel Wire

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