I need to interface Sensors(piezo electric sensor) to External interface board
Distance between these two are 15-20feet length so can you pls recommend Good and less drop out cables which can handle 1A is fine
Cable used for Sensor interface which can operate in <24VDC
Maximum voltage drop at 1A is easy to calculate.
How much voltage drop can you accept?
It’s early so I may not have the following details exactly correct:
Cable length = 20 feet
Cable is a loop so total cable length = cable length * 2 = 40 feet
Cable resistance = cable resistance per foot * 40
Voltage drop = cable current * cable resistance (E=IR)
Cable current = 1A
Therefore:
Voltage drop = 1 * total cable resistance
Classification: Internal
Thanks for your response
For Sensing Circuitry, it may flow max : 8-25mA current
This is the reason I have requested do we have any Low resistance cable if we have that is lesser than 0.4Oh for 15-20Ft length?
Copper cable resistance is dependant only on the wire gauge.
This table gives the ohms per length versus gauge.
Don’t have time to look into to it fully now (I’m just a visitor here not an employee), but I think you’ll need cable that is 19AWG or larger (e.g. 18AWG) to get < 400 milliohms @ 20 feet
Classification: Internal
Do we have any specialized cable which can have lesser Cable resistance ( flow of current it will be very less 24mA only
There is very little variation in ohms/foot among usable copper alloys.
Silver wire has 10% less resistance than copper but the price would be huge.
Classification: Internal
Let us know the price and spec since this is crucial to us to finalize our Circuit design
As I said I am just an volunteer here.
I’ve spent some of my personal time to try to help and provided way more information than you should have needed if you work in electronics or even were an electrician.
Perhaps when DigiKey employees show up they will help further but I’ve done all I’m willing to do for free at this point.
Classification: Internal
Oh Sorry,
Thanks and understood, I am under impression Digikey Executive
Looking of the hook-up wire we do list the below link shows the option I had found.
We have silver coated copper wire.
Would you have a preference on the wire AWG that you are wanting to use for this?
The resistance per 1000 ft you’re looking to target is 20 Ohms or less, which isn’t difficult to achieve, looking at random 24AWG copper is 16 Ohms per 1000ft.
Early again, math/lookups could be wrong 
Since I’ve had it memorized for my work of 45+ years, I’m pretty sure 22AWG cable is ~16 ohms/1000 feet. We sell 500 foot 22 AWG optional sensor cables for our analog instruments and custom calibrate them with 16 ohms in series (500’ in a loop = 1000’)
Charts I have say 24 AWG wire is 25.67 milliohms/foot = 25.67 ohms / 1000 feet one way, 51.34 ohms for a 1000 foot loop.
The OP asked for 0.4 ohms maximum for 20 feet one way.
Maximum loop = 40 feet so they want <0.4 ohms for 40 feet. 0.4/40 = 0.01 ohm/foot.
So they want < 10 milliohm/foot
20AWG = 10.15milliohm/foot which is just barely too high (0.406 ohms)
The smallest standard gauge that works is 19 AWG = 8.051 milliohm/foot.