Wire Strain Relief

Discussion in 'General Electronics Chat' started by seecumulus, Aug 4, 2011.

  1. seecumulus

    Thread Starter Member

    Jul 13, 2011
    31
    1
    Hello All -

    I would like some suggestions as to the best way to strain relief
    I/O wires on the edge of a circuit board.
    I/O wires qty. 19
    I/O wire guage ~ 18 guage
    These wires are soldered through hole method on the Card's Edge
    Connector.
    Suggest a bonding material / strain relief (ie.) Epoxy or other ?

    Thanks for any help
    :)
     
  2. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    Hot glue.

    If room permits, create a small loop in each wire and glue the loop to the PCB.
     
  3. seecumulus

    Thread Starter Member

    Jul 13, 2011
    31
    1
    Thank You.

    This poses a problem, there is no room.
    The wires are right on the card edge with very little card free area to bond to.
    Do manufacturer's use some foam flexible type glue or bonding material ?
     
  4. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    Standing the wires straight up (perpendicular to the PCB) and placing some hot glue around the base of each wire will provide some strain relief. The hot glue maintains some flexibility even after it cools.

    In most applications, wires that are subject to continual flexing are specially designed for the purpose e.g., the ribbon cables in scanners and ink jet printers. In addition, they often have connectors to distribute the load across more surface area.

    I can't really imagine an application that would use 18 awg wires and that required continual flexing at the PCB. Care to say what the PCB is used in?
     
  5. seecumulus

    Thread Starter Member

    Jul 13, 2011
    31
    1
    The Circuit Board is one of the First Generation Electric Vehicle
    Shunt DC Motor Controller Boards. We are talking a circuit board which is 25 + years old !
     
  6. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    How about a (good) photo of the PCB and wire attachments? It may provide some ideas for options.

    Ken
     
  7. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
    970
    Yes without a picture of the board showing the wire/attachment points and enclosure this thread is pointless.
     
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