Detectable_MaxCell_innerduct_1.jpg

January 04, 2016
What in the world is TFN

Posted by: Lee Bedingfield 5 minute read

Detectable_MaxCell.jpgI got the question the other day about the wire that is placed in our detectable MaxCell.  Specifically, I was asked what the heck TFN insulation is and how does it help?  If we’re going to talk about TFN then we might as well cover the whole detectable wire.  First off, our wire is 18AWG (American Wire Gauge) which is roughly 0.04” (1mm) of copper and this wire is single strand as laid out in our government specification.  It’s a good time to point out again that detectable MaxCell and detectable pull tape are NOT the same wire.  Our detectable pull tape uses 22AWG which is much smaller.  We’ll come back and discuss detectable pull tape in more detail at a later time.  So, all wire has a jacket or insulation covering the wire which brings us back to TFN insulation.  Most wires employ PVC as a jacket because of its great insulating property and TFN is no exception.  The difference is that TFN has an extra outer layer of Nylon which gives the wire better water, gasoline, and oil resistance which is perfect for going underground into infrastructure where you never know what you’re going to run into.  In addition to MaxCell, 18AWG Solid TFN is used in many appliance, lighting, and marine applications where heavy mechanical abuse comes into play.


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