Then, on Part B several safety wires are connected. Then, to that part (A) some other safety ground wires are attached, and one of them goes to metal part "B". A typical mistake is described like this: The safety ground from the AC inlet is grounded to a near by metal part called "A". This means, each safety wire must still work, if another one has a loose contact. For this reason, safety ground wires should not be cascaded. Keep apart the safety ground and circuit ground.Also don't make an issue about two different colors connected together, this is normal. Besides there is no need for a unique color scheme, since we usually ALREADY know we are working on DC heated filaments, just we don't know what is plus or minus. Also when building, you are going to see that you can't always do it 100% right as the number of available colors is not enough. There is no official standard for this anywhere, so this here is just a good proposal.
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