martinav (Customer) asked a question.

Edited November 4, 2022 at 12:47 PM
Separation of DC & AC

I'm putting together a production setup for a pressure testing and reporting rig. I have layed out the design separating AC and DC wiring. I would like to know two things...

 

  1. Is my assumption correct? DC Voltage, Cat5e data, rs232, thermocouple, analog & digital data to brx modules go into one bundle ok.
  2. AC voltage in the other

 

Also, what is the gap required? I want a tight design (shown below). I did not see any shielding I could get to help with allowing a closeby setup such as this.

 

Any other advice would be appreciated.

 

On the wire duct, blue indicates AC, grey DC

 

image

  • 5 answers
  • 821 views

  • martinav (Customer)

    Yea I wachted that. Its a good video.

  • Todd Dice (Customer)

    There are two factors I look at when answering your question.

     

    1. Cables I've seen for DC circuits are insulated to a maximum of 300-volts. If your panel includes 480-volts AC, you want those separated.
    2. Noise from an AC circuit interfering with DC circuitry.

      • Todd Dice (Customer)

        Know if your analog is 0-20mA or 4-20mA it is more noise resistant that 0-10V. Also, if you ever use a VFD, they are a real noise maker and can effect DC circuits. I had one that was "talking to" a 24VDC photoeye. I ended up using shielded motor cable (CF31-15-04-1) to prevent it.

 

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