When looking Hook-Up wire there are some common attributes that customers often have questions about.
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Wire Gauge expressed in AWG or American Wire Gauge. This is telling you the diameter of the conductor only and does not include the diameter of the insulation. Here is a Table that shows the different gauges. You would need to know if you are hooking this wire up to a contact as the contact would be sized to a specific gauge or range of gauges it will accept and still properly crimp. One note to remember is that the larger the gauge the smaller the diameter of the wire.
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Conductor Strand for this example we will look at part 422010 RD005-ND which is a 20AWG stranded hookup wire. Under conductor strand you will see this listed as 10/30 this means that there are 10 30 AWG strands of wire that make up this 20 AWG stranded wire. This can also be calculated as the cross-section area of 30 AWG wire =0.0509mm² so the total cross-section area of the wire would be 10 x 0.0509mm²= 0.509mm². Per AWG standards the cross section of 20 AWG wire would be .5mm.
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Insulation Thickness would be the thickness of the insulation measured from the conductor to the outside of the insulation.
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Insulation Diameter is the overall diameter of the wire with insulation. This would be the measurement you would want to use if you are needing to run the wire through a grommet or needing to calculate how many wires would fit in a backshell etc.