I see this all the time where wiring is improperly installed in 120/230 and up electrical systems where some one has put the black wire on where the white wire should be .
The problem is that in AC or Alternating current wiring like in your home there are 3 wires a black wire known as the hot wire which in the code is called energized conductor and a white wire called a neutral known in the code as a un-enrgised conductor and a green ground wire.
But here is the problem in DC wiring known as Direct Current wiring you fined a red wire which is positive wire and a black wire which is negative.
So you take some one who is not qualified to do electrical work like a coal mine electrician or auto mechanic or others who work with DC and think they can wire there homes and you can quickly see the problem of how wiring gets reversed on devises. and this can leed to dangerous situations where some one gets zapped or even electrocuted wen a receptacle or plug is wired backward and there is a wiring fault.
It is back to the same old argument only professionals should be doing work and just because your an electrician in the steel mill or coal mine this does not qualify you to do house or structure wiring.
but the wiring colors set up in the code do not help matters. Why would they do such a thing knowing the potential for individuals not qualified and have a dangerous amount of knowledge about electricity to do something . but as usual no one has any good answers and its always the excuse only professionals should be doing this kind of work. Fine and dandy but even professionals get mixed up to I see it all the time working with professional electricians they wire fire alarms backwards all the time because black to them means the energized line when it the exact opposite with fire systems.
so even if the pros screw up why would the code bodys allow it to go on?
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