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  1. #1
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    Cable selection for instruments,actuators, pumps, etc

    Hello everybody,

    It is my first time choosing the cables myself, we have to many instruments and other devices in the site,
    some are 800 meters fr from the control room (DCS), so if we want to choose a signal cable for an rotork actuator IQ30, a flow meter, pressure transmitter, does 16 AWG is enough for these kind of devices (all are 4-20 mA output signal type except Rotork).

    Looking forward for your reply.

    Best Regards

    •   Alt12th August 2017, 22:25

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  2. #2
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    Re: Cable selection for instruments,actuators, pumps, etc

    Wires that carry power should not be the same wires that carry signals or information.

    Long wire runs should be low impedance. If they are high impedance then they more easily pick up noise interference. Shielding is a good idea.

    I'm not expert in this field so I could be wrong. There may be reliable methods to combine everything into two 16 gauge twisted wires.

    800 meters is half a mile. Look at wire tables to see what resistance is in various copper diameters:

    http://amasci.com/tesla/wire1.html

    http://www.technifest.com/wire_gauge.htm

    http://www.powerstream.com/Wire_Size.htm



    •   Alt13th August 2017, 02:50

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  3. #3
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    Re: Cable selection for instruments,actuators, pumps, etc

    Hi,

    Especially power cables (pump) are mainly selected by voltage, current and the allowed voltage drop.
    You need to know those informations.

    Klaus



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