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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
    Posts
    1
    I am also encountering this issue. Dont know why its hapenning.

  3. #3
    Senior Member
    Join Date
    Oct 2013
    Posts
    1,958
    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.
    LED, Incorporated
    Raleigh, NC 27614

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