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You derate the wire if any part of the run passes through an engine room because of the reduction in ampacity as the ambient temperature rises. While maybe not in your case, the engine rooms of many powerboats can get pretty warm - it's just an attempt to come up with a universal set of rues.
MaineSail: Ancor scam ?
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"Verbosity leads to unclear inarticulate things"
~Dan Quayle
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