An IP rating indicates resistance to dust and water. IP54 suggests partial dust protection and resistance to splashing water. IP65 provides total dust-tight sealing and protection from water jets. IP66 and above offer even higher resilience, critical for exposed outdoor deployments. [pdf]
An IP65 solar panel can handle 4.35 lbs/sq. inch (or 30kPa) of pressure from 3.3 gallons (or 12.5 liters) of water per minute for a total of 15 minutes at a distance of 9 and a half feet (or 3m) from a quarter of an inch-sized nozzle (or 6.3mm). [pdf]
Even though standard NM cable has a vinyl outer jacket and waterproof insulation around the individual conducting wires, it is not intended for use in outdoor locations. Instead, cables must be approved for outdoor use. And when using conduit, there are additional rules that must be followed. The applicable rules. .
Many of the rules applying to outdoor receptacle outlets are aimed at reducing the likelihood of shock, which is a notable risk anytime a user is in direct contact with. .
The rules for outdoor lighting are principally about using fixtures that are rated for use in damp or wet locations: 1. Light fixtures in wet/exposed areas must be. .
This is not an NEC requirement, but it could save your life, not to mention prevent considerable trouble with your service providers. Call 811, the national. Due to this, an outdoor socket should be at minimum IP66 rated, making it water and dust resistant. Additionally, any outdoor socket MUST be protected by a 30mA RCD e.g. it must be wired off of a 30mA circuit with an RCD in your consumer unit. [pdf]
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