IP Ratings Explained for Electrical Enclosures
What IP55, IP56 and IP66 actually mean, and how to pick the right ingress protection rating for outdoor electrical enclosures.
Two digits, two hazards
The first IP digit rates protection against solids (6 = dust-tight), the second against water (5 = jets, 6 = powerful jets, 8 = immersion). An IP66 enclosure is dust-tight and withstands heavy water jets — not the same as submersible.
Matching rating to exposure
Sheltered outdoor metering typically calls for IP53–IP55; exposed weather-facing enclosures and wash-down areas justify IP56 or IP66. Over-specifying costs money in gaskets and glands; under-specifying costs equipment.
The rating is only as good as the install
Every unsealed gland hole, missing gasket screw and drilled-on-site penetration downgrades the rating. Order enclosures with the right cutouts from the fabricator, and seal everything that enters the box.
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