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RE: Dielectric constant for a DC cable

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Duster

A

In Reply to: RE: Dielectric constant for a DC cable posted by JeremyMTB on April 23, 2020 at 11:52:13

21 AWG solid core wire is much more manageable for a 10-conductor cable assembly than 18 AWG solid core wire with twice the cross section. The key issue to consider is potential voltage drop due to gauge and length, of which 21 AWG when 3 feet long or less will be the most advisable 1.5 percent or less voltage drop for a low-current 5V DC umbilical application, for example. Do you know the rated voltage and current draw involved with all 10 conductors?

Follow Ups:

RE: Dielectric constant for a DC cable - JeremyMTB 06:24:18 04/24/20 (7)
This is what I got back from the Manufacturer:

Pin 1, 3, 7 are +12V.
Pin 5, 9 are -12V.
The rest are GND.

Pin 1, 2 are rated for 1.5A
- RE: Dielectric constant for a DC cable - Duster 03:56:11 04/25/20 (6)
  The 21 AWG AirLok hookup wire would be perfect for that application. Can you upload a photo or indicate the make/model of the DC connector? Is it the same type of connector at both ends?
  
  I suggest building the DC umbilical with 2 foot wires, which will shorten a bit after they are gently twisted together with a lazy twist rate to form a bundle with a usable bend radius.
  - RE: Dielectric constant for a DC cable - JeremyMTB 19:21:57 04/25/20 (5)
    It's a hirose rm-w.
    
    https://www.hirose.com/product/download/?distributor=mouser&type=catalogue&lang=en&num=RM15WTPZ-10P(71)
    - RE: Dielectric constant for a DC cable - Duster 06:45:29 04/27/20 (4)
      Make sure to add more heat shrink for strain relief where the wiring is secured to the connector.
      - RE: Dielectric constant for a DC cable - JeremyMTB 12:27:55 04/27/20 (3)
        
        In Reply to: RE: Dielectric constant for a DC cable posted by Duster on April 27, 2020 at 06:45:29
        
        Just ordered the wire. I will wait to it comes to order the connectors as I am not sure what size cable clamp to buy. I need to see what the diameter of the 10 wires and some shrink tubing come out to.
        
        I appreciate all the advise.
        
        RE: Dielectric constant for a DC cable - Duster 12:37:15 04/27/20 (2)
        
        In Reply to: RE: Dielectric constant for a DC cable posted by JeremyMTB on April 27, 2020 at 12:27:55
        
        Ask myself or Chris of VH Audio for any further advice. Maybe Chris can estimate the diameter of the 10-conductor bundle, and a particular size/type of heat shrink to choose. I recommend the Techflex Clean Cut braided sleeving he carries, since it is easy to work with, and provides excellent protection for the purpose.
        
        RE: Dielectric constant for a DC cable - JeremyMTB 13:39:03 04/29/20 (1)
        
        In Reply to: RE: Dielectric constant for a DC cable posted by Duster on April 27, 2020 at 12:37:15
        
        Ok. Chatted back and forth with Chris a little and ordered everything up. I will report back when it showed up. Mouser is not always the quickest getting to me.
        
        RE: Dielectric constant for a DC cable - Duster 14:04:15 04/29/20 (0)
        
        In Reply to: RE: Dielectric constant for a DC cable posted by JeremyMTB on April 29, 2020 at 13:39:03
        
        I'll keep an eye out for the report.
        
        Cheers, Duster

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