Measuring the insulation concentricity and wall thickness is a quality assurance test that can identify uniformity issues. Wires with non-uniform insulation (or cables with non-uniform jackets) will have an unbalanced insulation wall thickness that can make the wire/cable more susceptible to mechanical or electrical failure. This test can be performed on wire gauges ranging from 30AWG to 0000AWG and on wholly tape wrapped and extruded constructions.
Insulation Concentricity and Wall Thickness
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Perform visual examination of the specimen. Record any observed defects.
Perform a cross section cut of the wire.
Take cross section photo of wire.
Measure minimum wall thickness.
Measure maximum wall thickness.
Report the ratio of minimum to maximum wall thickness.