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Re: Yellow ground safety wire
"Is this like the age-old line vs. rope argument?"
You've probably hit the nail on the head with that one.
There are all sorts of standards. We know a North Wind blows from the north, but what's a "northerly" wind? One that is blowing TO or FROM the north? Well, that depends on who you ask. Hell, you can't even get boat electricians to agree on whether fittings on a boat should be bonded, or connected to a ground bus, or simply isolated. Depends on whether their goal is to prevent galvanic problems, fool lightning, or sell new parts apparently.
The bottom line is often "what's in stock?" and "what can I afford?" and if "proper" wiring schemes call for ten colors of wire but your budget says you only need 5 spools...compromises get made. As a recreational boater, you don't have to comply with the same specs as commercial builders. And if you use plenty of wire tags and leave schematics, even pencil drawn ones, the colors aren't quite as critical.