why we use +ve load distribution in 24v , and -ve load distribution in 48volt.

why we use +ve load distribution in 24v , and -ve load
distribution in 48volt.?

Question Posted / tahir aziz

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why we use +ve load distribution in 24v , and -ve load distribution in 48volt.?..

Answer / marimuthuraj

Telecom typically passes voice signals. If we used AC to
power the voice line, the AC would impose an audible hum,
which would disrupt communications. It would be really
irritating to listen to as well!

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