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Thread: NVP - Nominal Velocity of Propagation for Lutron cables

  1. #1

    NVP - Nominal Velocity of Propagation for Lutron cables

    Hi:


    If you have some installations where the length of the cable run is suspected to be perhaps a little (too) long, it would be nice to measure the length of the cable. However, meter sticks won't work when the wire is pulled, so a Time Domain Reflectometer (TDR) can come in handy? Unfortunately without a known 50+ ft length of this cable, it can be hard to guess/measure what the NVP value of cable is, and therefore impossible to measure with a TDR.
    Would anyone have some typical average values for the Lutron cables?


    18/2 + Belden 9461
    grx-cbl-346s
    16/2 + Belden 9461
    third-party cables
    etc...


    Perhaps other people have already done sample measurements and/or the factory has some data to share? If enough people can share their data, then we should be able to get a good average for each cable type, and then make useful measurements?

  2. #2
    Junior Member
    Join Date
    Oct 2020
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    1
    I am also encountering this issue. Dont know why its hapenning.

  3. #3
    Senior Member
    Join Date
    Oct 2013
    Posts
    2,580
    Electrical distributors use a meter that measures the resistance of wire. You input the criteria - AL/CU, gauge, stranded, etc. - and it calculates the length based on the resistance. They use it to determine how much wire is left on a reel. It seems to be fairly accurate. If you have a good relationship with a distributor they will probably let you borrow it.
    Convergence Technologies Raleigh, North Carolina
    www.convergenceusa.com

  4. #4
    The Velocity of propagation (Vp) of a cable is the speed at which an electrical signal can propagate through the cable in comparison to the speed of light. For example, in a vacuum, the velocity of propagation would be 100% or 1 (depending on how it is represented). So, if the Propagation Velocity is 70%, it means that the signal in a cable will propagate at 0.7 times the speed of a signal if the dielectric of the cable was vacuum. xmanager website ostora tv
    The Velocity factor or Propagation Velocity of a cable can be calculated by the formula below (where ϵ is the dielectric constant of the dielectric material used in the cable).
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