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Capillary Action in Cables.

Has anyone any real life examples of this causing problems please?

https://www.lec-expert.com/topics/waterproof-led-lights--preventing-capillary-action-in-power-supply-cables


Z.
Parents

  • perspicacious:

    I don't consider the "symptoms" described here are capillary in a strict definition. It is more of a pumping action.


    Regards


    BOD




     

    To “pump” one end of the cable has to be in a sealed enclosure with a volume of air that goes through cycles of heating and cooling.


    Take a ball float valve in a hot water cylinder header tank which has a pin hole in the ball float below the water line, as the cylinder heats the hot water expands into to header tank which heats up the ball and the air in it, the air expands and comes out through the pinhole below the waterline, then as it all cools down water is drawn back into the ball and eventually it sinks.


    Now consider an IP rated enclosure, is it better sealed or with a drain hole in the bottom of it?


    Andy Betteridge
Reply

  • perspicacious:

    I don't consider the "symptoms" described here are capillary in a strict definition. It is more of a pumping action.


    Regards


    BOD




     

    To “pump” one end of the cable has to be in a sealed enclosure with a volume of air that goes through cycles of heating and cooling.


    Take a ball float valve in a hot water cylinder header tank which has a pin hole in the ball float below the water line, as the cylinder heats the hot water expands into to header tank which heats up the ball and the air in it, the air expands and comes out through the pinhole below the waterline, then as it all cools down water is drawn back into the ball and eventually it sinks.


    Now consider an IP rated enclosure, is it better sealed or with a drain hole in the bottom of it?


    Andy Betteridge
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