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RE: Dielectric constant for a DC cable

73.19.55.31

In Reply to: RE: Dielectric constant for a DC cable posted by JeremyMTB on April 23, 2020 at 09:43:58

VH Audio 21 AWG UniCrystal OCC Copper Hookup Wire with AirLok Insulation is excellent for use as a low to medium current DIY DC umbilical build. Label each conductor at both ends, solder the wires to the corresponding terminals, then gently twist the conductors just enough to accomplish a lazy twist so the wiring can have a usable bend radius, which might require a bit longer length than only 18 inches for the solid core wires. However, the cellular/foamed FEP Teflon insulation makes the solid core wire easier to bend than a solid insulation. Use thin heat shrink to hold the wires together, then cover with Techflex braided sleeving for protection.

See link:

https://www.vhaudio.com/wire.html (Open in New Window)

Follow Ups:

RE: Dielectric constant for a DC cable - JeremyMTB 11:52:13 04/23/20 (9)
Thanks. I will check that out. any reason to choose the 21 AWG over the 18 AWG?
- RE: Dielectric constant for a DC cable - Duster 15:25:55 04/23/20 (8)
  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?
  - 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)
        
        In Reply to: RE: Dielectric constant for a DC cable posted by Duster on April 25, 2020 at 03:56:11
        
        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)
        
        In Reply to: RE: Dielectric constant for a DC cable posted by JeremyMTB on April 25, 2020 at 19:21:57
        
        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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