How can you tell a CAT6 cable is externally rated? It is a requirement for a project I'm working on.
Many thanks, Vlad
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No common usage cable is rated for exposure to the natural elements. If it isn't going to be used inside of a home or environment-controlled switching office, it either needs to be specially ordered, or carried inside of conduit which is tailored to the task. Not to say that it won't work, but rather that it isn't designed to perform under that duress. Even a small amount of water can attenuate a signal if it somehow finds its way into the core, and there are numerous ways in which the cladding of a non-hardened cable can be breached.
Short answer: If it looks like the stuff you would plug into your home device, don't use it outside. It needs to be protected.