I´m designing an access control device and I need to place it in a plastic case so it can be easily installed on a wall, for example. Also, the PCB will have a special coating for humidity protection.

Regarding IP code grading for dust and water protection I would like to know:

  • If the device is on the outside without protection (roof or similar), would an IP54 plastic case be enough?

  • If the device is on the outside but it is protected with a roof or similar, would an IP54 plastic case be enough?

  • If this is not correct, what would be a right IP code grading for the case?

  • $\begingroup$ Are you expecting rain like Noah’s flood? $\endgroup$
    – Solar Mike
    Dec 28, 2020 at 16:35
  • $\begingroup$ No, normal rain, no Noah flood expected $\endgroup$
    – LazyTurtle
    Dec 28, 2020 at 16:44
  • $\begingroup$ I suggest IP64 or better. $\endgroup$ Dec 28, 2020 at 18:21
  • 1
    $\begingroup$ IP5- will not prevent all dust penetration. We have no idea where in the world you are, so we can't decide for you if IP5- is "good enough" or you really need IP6-. IP-4 will not protect if the box might be underneath a water leak or overflow from the roof guttering, etc. I would go for IP64 or IP65 depending on where the device will be mounted, and if you are designing it for use by other people, definitely IP65. $\endgroup$
    – alephzero
    Dec 28, 2020 at 22:09
  • $\begingroup$ @alephzero Thank you for your answer. You can post it as an answer. $\endgroup$
    – LazyTurtle
    Jan 7, 2021 at 10:32


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