[GreenKeys] Color Codes??

[Jim Walls]

wa2hwj at att.net wrote:

 > Has anyone ever seen a 48VDC color code that labels the positive as
 > BLACK and the negative as RED?  I seem to recall that RED is always
 > positive.


Very common in 48VDC plant
Black = return
Red = supply

Since 48V station battery plant (TelCo central offices, etc) are 
positive ground, the red is positive and the black is negative.

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Jim Walls - K6CCC
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