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3734 Views 1 Reply Latest reply: Jul 28, 2014 10:47 AM by Rick RSS
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Jul 25, 2014 12:21 AM

Distance of External Interfaces in Wet Environments

Hello again, I am working on a project that involves sensors in wet environments since it will be measuring moisture and ph levels. So  obviously, there are going to be external connections that are exposed to the elements, although the main circuit will be enclosed in a sealed box.


Does anyone know how the contacts should be placed to avoid any problems, any design specifications? Somebody mentioned creepage, and although I'm somewhat familiar with the term, I'm not entirely that knowledgeable with implementation.


Any one with suggestions and clarifications is highly appreciated.

  • Rick designspecialist-power 54 posts since
    Mar 22, 2011
    Currently Being Moderated
    Jul 28, 2014 10:47 AM (in response to Riley)
    Distance of External Interfaces in Wet Environments

    Google "Ingress Protection Ratings" and "creepage & clearance"


    Different enclosure & connector systems are designed to protect against foreign materials/bodies to various degrees, as signified by an IP designation, such as "IP68"


    "NEMA" ratings are another rating system for essentially the same purpose, with a different alphanumeric classification code.


    Moisture causes increased conductivity across a surface, hence larger spacing between conductors is necessary to maintain a given insulation level when that insulation's surface is moist, rather than dry. 

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