A relatively recent innovation are IP68 rated cable glands which encorporate a Gore-tex breathing membrane. This way your enclosure remains free of condensed moisture as the enclosure can breathes dry air as temperatures (and pressure inside the enclosure) change throughout the day.
Beautiful for outdoor enclosed sensitive electronic equipment/ data loggers/ monitoring equipment etc. I have been using products by Wiska which are stocked at most Edmundsons branches.
The meaning of life is a blank sheet; write on it wisely. ~ M.Cutler.