2006-11-07 17:56:55 · 2 answers · asked by rabdulahed 1 in Science & Mathematics ➔ Engineering
I hope someone else can read between the lines to see what your question really means.
If 48VDC is grounded, then it isn't 48VDC, it is Ground! The purpose for grounding a signal line labelled as 48VDC can only be to notify the source of the voltage that there is a connection at the other end.
2006-11-07 18:11:02 · answer #1 · answered by Mez 6 · 0⤊ 0⤋
Wired telcom uses ground (earth) as one conductor, and wire for the other. One common trouble is accidental ground faults. These are often high resistance wet paths. When the positive side of the power supply is connected to ground, any accidental ground circuits tend to form corrosion that forms a diode, The diode increases the effective resistance to ground, diminishing the ground current.
If the negative side of the power supply is connected to ground, ground currents corrode the conductor. Positive ground protects the conductor
2006-11-08 07:45:49 · answer #2 · answered by Ed 6 · 1⤊ 0⤋